/* ============================================================
   MiSitio Tools - Estilos Globales
   Versión: 4.1 (Corregido y optimizado para producción)
   Desarrollado por VIX Hosting - Perú
   ============================================================ */

/* ===== 1. VARIABLES CSS ===== */
:root {
    /* Colores base */
    --color-bg-primary: #f8fafc;
    --color-bg-secondary: #ffffff;
    --color-bg-card: #ffffff;
    --color-bg-elevated: #f1f5f9;
    --color-bg-input: #ffffff;
    --color-bg-overlay: rgba(0, 0, 0, 0.7);

    /* Texto */
    --color-text-primary: #0f172a;
    --color-text-secondary: #475569;
    --color-text-tertiary: #94a3b8;
    --color-text-inverse: #ffffff;
    --color-text-placeholder: #94a3b8;

    /* Bordes */
    --color-border-light: #e2e8f0;
    --color-border-medium: #cbd5e1;

    /* Acento */
    --color-accent: #6366f1;
    --color-accent-dark: #4f46e5;
    --color-accent-light: #818cf8;
    --color-accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);

    /* Estados */
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-info: #3b82f6;

    /* Sombras */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);

    /* Bordes redondeados */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    --radius-full: 9999px;

    /* Tipografía */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;

    /* Tamaños de fuente */
    --font-size-xs: 0.75rem;    /* 12px */
    --font-size-sm: 0.875rem;   /* 14px */
    --font-size-base: 1rem;     /* 16px */
    --font-size-lg: 1.125rem;   /* 18px */
    --font-size-xl: 1.25rem;    /* 20px */
    --font-size-2xl: 1.5rem;    /* 24px */
    --font-size-3xl: 2rem;      /* 32px */
    --font-size-4xl: 2.5rem;    /* 40px */
    --font-size-5xl: 3rem;      /* 48px */

    /* Transiciones */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* Espaciado */
    --spacing-1: 0.25rem;   /* 4px */
    --spacing-2: 0.5rem;    /* 8px */
    --spacing-3: 0.75rem;   /* 12px */
    --spacing-4: 1rem;      /* 16px */
    --spacing-5: 1.25rem;   /* 20px */
    --spacing-6: 1.5rem;    /* 24px */
    --spacing-8: 2rem;      /* 32px */
    --spacing-10: 2.5rem;   /* 40px */
    --spacing-12: 3rem;     /* 48px */
    --spacing-16: 4rem;     /* 64px */
    --spacing-20: 5rem;     /* 80px */

    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
    --z-toast: 1080;

    /* Otros */
    --focus-ring: 0 0 0 3px rgba(99, 102, 241, 0.4);
}

/* ===== 2. RESET Y BASE ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-weight: var(--font-weight-regular);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
    min-height: 100dvh;
    transition: background var(--transition-base), color var(--transition-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== 3. SELECCIÓN DE TEXTO ===== */
::selection {
    background: var(--color-accent);
    color: white;
}

::-moz-selection {
    background: var(--color-accent);
    color: white;
}

/* ===== 4. SCROLLBAR PERSONALIZADA ===== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-elevated);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb {
    background: var(--color-accent-light);
    border-radius: var(--radius-full);
    transition: background var(--transition-fast);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-accent);
}

/* ===== 5. TIPOGRAFÍA Y ENLACES ===== */
a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-accent-dark);
}

a:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

img,
svg {
    display: block;
    max-width: 100%;
}

/* ===== 6. UTILIDADES ===== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.gradient-text {
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hidden {
    display: none !important;
}

/* ===== 7. ANIMACIONES GLOBALES ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes fadeOutRight {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.4);
    }
    70% {
        box-shadow: 0 0 0 20px rgba(99, 102, 241, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(99, 102, 241, 0);
    }
}

@keyframes bounce {
    0%,
    100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

/* Respetar preferencias del usuario para reducir movimiento */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }
}

/* ===== 8. NAVBAR ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border-light);
    padding: 0.75rem 0;
    transition: padding var(--transition-base),
                box-shadow var(--transition-base),
                background var(--transition-base);
}

.navbar.scrolled {
    padding: 0.5rem 0;
    box-shadow: var(--shadow-md);
    background: rgba(255, 255, 255, 0.98);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-8);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-4);
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-extrabold);
    white-space: nowrap;
}

.logo i {
    font-size: 1.75rem;
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: bounce 2s ease-in-out infinite;
    will-change: transform;
}

.logo .highlight {
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Navegación */
.nav-links {
    display: flex;
    gap: var(--spacing-8);
    align-items: center;
}

.nav-links a {
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
    padding: 0.5rem 0;
    position: relative;
    transition: color var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent-gradient);
    transition: width var(--transition-base);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-accent);
}

.nav-links a:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 4px;
}

/* Acciones */
.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.theme-btn {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border-light);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    user-select: none;
    flex-shrink: 0;
}

.theme-btn:hover {
    background: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
    transform: rotate(15deg);
}

.theme-btn:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.theme-btn:active {
    transform: scale(0.95);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    padding: var(--spacing-2) var(--spacing-4);
    cursor: pointer;
    transition: all var(--transition-base);
    font-weight: var(--font-weight-medium);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    user-select: none;
}

.btn-outline:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline:active {
    transform: scale(0.98);
}

.btn-outline:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* ===== 9. HERO ===== */
.hero {
    padding: calc(72px + var(--spacing-16)) var(--spacing-8) var(--spacing-16);
    text-align: center;
    background: radial-gradient(circle at 0% 0%, rgba(99, 102, 241, 0.08) 0%, transparent 50%);
    animation: fadeIn 0.8s ease-out;
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
}

.hero .badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-2) var(--spacing-4);
    background: rgba(99, 102, 241, 0.15);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-accent);
    margin-bottom: var(--spacing-8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.badge-new {
    background: var(--color-accent);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    animation: pulse 1.5s infinite;
}

.hero h1 {
    font-size: var(--font-size-5xl);
    font-weight: var(--font-weight-extrabold);
    line-height: 1.2;
    margin-bottom: var(--spacing-6);
    letter-spacing: -0.02em;
}

.hero p {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-12);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-16);
    flex-wrap: wrap;
}

.hero-stats .stat {
    text-align: center;
    animation: fadeIn 0.8s ease-out backwards;
}

.hero-stats .stat:nth-child(1) { animation-delay: 0.1s; }
.hero-stats .stat:nth-child(2) { animation-delay: 0.2s; }
.hero-stats .stat:nth-child(3) { animation-delay: 0.3s; }
.hero-stats .stat:nth-child(4) { animation-delay: 0.4s; }

.hero-stats .stat .number {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-extrabold);
    color: var(--color-accent);
}

.hero-stats .stat .label {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

/* ===== 10. TOOL CONTAINER ===== */
.tool-container {
    max-width: 1400px;
    margin: 0 auto var(--spacing-12);
    padding: 0 var(--spacing-8);
}

/* ===== 11. TABS ===== */
.input-tabs {
    display: flex;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-8);
    border-bottom: 2px solid var(--color-border-light);
}

.tab-btn {
    background: transparent;
    border: none;
    padding: var(--spacing-4) var(--spacing-8);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    user-select: none;
}

.tab-btn i {
    font-size: var(--font-size-lg);
}

.tab-btn::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent-gradient);
    transition: width var(--transition-base);
}

.tab-btn:hover {
    color: var(--color-accent);
}

.tab-btn.active {
    color: var(--color-accent);
}

.tab-btn.active::after {
    width: 100%;
}

.tab-btn:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* ===== 12. DROP ZONE ===== */
.drop-zone {
    border: 3px dashed var(--color-accent-light);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-20) var(--spacing-8);
    text-align: center;
    transition: all var(--transition-base);
    background: var(--color-bg-card);
    cursor: pointer;
    animation: fadeIn 0.6s ease-out;
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--color-accent);
    background: rgba(99, 102, 241, 0.05);
    transform: scale(1.01);
}

.drop-zone:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-4);
}

.drop-icon {
    position: relative;
    display: inline-block;
}

.drop-icon i {
    font-size: 5rem;
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.pulse-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.drop-zone h3 {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
}

.drop-zone p {
    color: var(--color-text-secondary);
}

.drop-note {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    margin-top: var(--spacing-2);
}

/* ===== 13. BOTONES ===== */
.btn-primary {
    background: var(--color-accent-gradient);
    border: none;
    border-radius: var(--radius-md);
    padding: var(--spacing-3) var(--spacing-8);
    color: white;
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-3);
    font-size: var(--font-size-base);
    user-select: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.btn-primary:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.btn-primary-small {
    background: var(--color-accent-gradient);
    border: none;
    border-radius: var(--radius-sm);
    padding: var(--spacing-2) var(--spacing-4);
    color: white;
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--font-size-xs);
    user-select: none;
}

.btn-primary-small:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-primary-small:active {
    transform: scale(0.98);
}

.btn-primary-small:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.btn-secondary {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    padding: var(--spacing-2) var(--spacing-4);
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: var(--font-size-sm);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    color: var(--color-text-secondary);
    user-select: none;
}

.btn-secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.btn-secondary:active {
    transform: scale(0.98);
}

.btn-secondary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-secondary:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.btn-outline-small {
    background: transparent;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    padding: var(--spacing-2) var(--spacing-4);
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: var(--font-size-xs);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    color: var(--color-text-secondary);
    user-select: none;
}

.btn-outline-small:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    transform: translateY(-2px);
}

.btn-outline-small:active {
    transform: scale(0.98);
}

.btn-outline-small:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-outline-small:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.btn-convert {
    margin: var(--spacing-4) var(--spacing-6);
    padding: var(--spacing-4);
    background: var(--color-accent-gradient);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-3);
    width: calc(100% - var(--spacing-12));
    position: relative;
    overflow: hidden;
    user-select: none;
}

.btn-convert::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.6s;
}

.btn-convert:hover::before {
    left: 100%;
}

.btn-convert:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
}

.btn-convert:active {
    transform: scale(0.98);
}

.btn-convert:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.btn-convert:disabled::before {
    display: none;
}

.btn-convert:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.btn-icon {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-sm);
    width: 36px;
    height: 36px;
    cursor: pointer;
    transition: all var(--transition-base);
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    user-select: none;
    flex-shrink: 0;
}

.btn-icon:hover {
    background: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
}

.btn-icon:active {
    transform: scale(0.95);
}

.btn-icon:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-icon:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.btn-text {
    background: none;
    border: none;
    color: var(--color-text-tertiary);
    cursor: pointer;
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
    padding: var(--spacing-1);
}

.btn-text:hover {
    color: var(--color-danger);
}

.btn-text:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* ===== 14. TARJETAS (CARDS) ===== */
.card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.card-header {
    padding: var(--spacing-5) var(--spacing-6);
    border-bottom: 1px solid var(--color-border-light);
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.card-header i {
    font-size: var(--font-size-xl);
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.card-header h3 {
    flex: 1;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
}

/* ===== 15. FORMULARIOS Y CONTROLES ===== */
.control-group {
    padding: var(--spacing-5) var(--spacing-6);
    border-bottom: 1px solid var(--color-border-light);
    transition: background var(--transition-fast);
}

.control-group:hover {
    background: rgba(99, 102, 241, 0.02);
}

.control-group label {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-4);
    color: var(--color-text-primary);
}

.control-group label i {
    color: var(--color-accent);
}

/* Inputs y selects */
input[type="text"],
input[type="number"],
input[type="url"],
input[type="email"],
input[type="password"],
select,
textarea {
    font-family: var(--font-family);
    padding: var(--spacing-3) var(--spacing-4);
    border: 2px solid var(--color-border-light);
    border-radius: var(--radius-md);
    background: var(--color-bg-input);
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    width: 100%;
}

input::placeholder,
textarea::placeholder {
    color: var(--color-text-placeholder);
    opacity: 1;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: var(--focus-ring);
}

input:disabled,
select:disabled,
textarea:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Sliders (range) */
input[type="range"] {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: linear-gradient(90deg, var(--color-accent-light) 0%, var(--color-accent) 85%);
    border-radius: 3px;
    outline: none;
    padding: 0;
    border: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--color-accent);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    border: 2px solid white;
    transition: transform var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--color-accent);
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid white;
}

input[type="range"]:focus-visible {
    outline: none;
}

input[type="range"]:focus-visible::-webkit-slider-thumb {
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.4), var(--shadow-md);
}

/* Checkbox toggle (switch) */
.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 26px;
    flex-shrink: 0;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider.round {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-border-medium);
    transition: background var(--transition-base);
    border-radius: 34px;
}

.slider.round::before {
    position: absolute;
    content: '';
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: transform var(--transition-base);
    border-radius: 50%;
}

input:checked + .slider.round {
    background-color: var(--color-accent);
}

input:checked + .slider.round::before {
    transform: translateX(24px);
}

input:focus-visible + .slider.round {
    box-shadow: var(--focus-ring);
}

/* Toggle header */
.toggle-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-4);
}

.toggle-header label {
    margin-bottom: 0;
    flex: 1;
}

/* ===== 16. PROGRESS BARS ===== */
.progress-bar {
    margin: var(--spacing-4) var(--spacing-6) var(--spacing-6);
    height: 4px;
    background: var(--color-border-light);
    border-radius: 2px;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: var(--color-accent-gradient);
    width: 0%;
    transition: width 0.3s ease;
}

.progress-text {
    display: block;
    text-align: center;
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    margin-top: var(--spacing-2);
}

/* ===== 17. BATCH PROCESSING ===== */
.batch-panel {
    margin-top: var(--spacing-8);
    margin-bottom: var(--spacing-8);
    padding: var(--spacing-6);
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    animation: fadeIn 0.5s ease-out;
}

.batch-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-6);
    flex-wrap: wrap;
    gap: var(--spacing-4);
}

.batch-header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.batch-header-left i {
    font-size: var(--font-size-xl);
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.batch-badge {
    background: var(--color-accent-light);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
}

.batch-header-actions {
    display: flex;
    gap: var(--spacing-2);
    flex-wrap: wrap;
}

.batch-stats {
    display: flex;
    gap: var(--spacing-8);
    padding: var(--spacing-4);
    background: var(--color-bg-elevated);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-6);
    flex-wrap: wrap;
}

.batch-stats-item {
    text-align: center;
}

.batch-stats-number {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-accent);
}

.batch-stats-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

.batch-list {
    max-height: 400px;
    overflow-y: auto;
    margin-bottom: var(--spacing-6);
}

.batch-item {
    padding: var(--spacing-3);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-3);
    transition: all var(--transition-base);
    animation: fadeIn 0.3s ease-out;
}

.batch-item.processing {
    border-color: var(--color-accent);
    background: rgba(99, 102, 241, 0.05);
}

.batch-item.completed {
    border-color: var(--color-success);
    background: rgba(16, 185, 129, 0.05);
}

.batch-item.error {
    border-color: var(--color-danger);
    background: rgba(239, 68, 68, 0.05);
}

.batch-item-preview {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.batch-status {
    font-size: var(--font-size-xl);
}

.batch-info {
    flex: 1;
}

.batch-name {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.batch-size {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

.batch-progress {
    margin-top: var(--spacing-2);
    height: 3px;
    background: var(--color-border-light);
    border-radius: 3px;
    overflow: hidden;
}

.batch-progress-bar {
    height: 100%;
    background: var(--color-accent-gradient);
    width: 0%;
    transition: width 0.3s;
}

.batch-actions {
    display: flex;
    gap: var(--spacing-4);
    flex-wrap: wrap;
}

/* ===== 18. FEATURES SECTION ===== */
.features-section {
    margin-top: var(--spacing-16);
    padding: var(--spacing-12) 0;
}

.features-header {
    text-align: center;
    margin-bottom: var(--spacing-12);
}

.features-header h2 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-2);
}

.features-header p {
    color: var(--color-text-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-8);
}

.feature-card {
    text-align: center;
    padding: var(--spacing-8);
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.feature-card i {
    font-size: var(--font-size-3xl);
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-4);
}

.feature-card h3 {
    margin-bottom: var(--spacing-2);
    font-size: var(--font-size-lg);
}

.feature-card p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.feature-card:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* ===== 19. SHORTCUTS INFO ===== */
.shortcuts-info {
    margin-top: var(--spacing-8);
    padding: var(--spacing-4);
    background: var(--color-bg-elevated);
    border-radius: var(--radius-md);
    text-align: center;
}

.shortcuts-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-4);
    flex-wrap: wrap;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.shortcuts-content i {
    color: var(--color-accent);
}

kbd {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-sm);
    padding: 0.2rem 0.6rem;
    font-family: monospace;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    box-shadow: var(--shadow-sm);
}

/* ===== 20. HISTORY ===== */
.history-section {
    margin-top: var(--spacing-12);
    padding: var(--spacing-6);
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    animation: fadeIn 0.6s ease-out;
}

.section-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-6);
}

.section-header i {
    font-size: var(--font-size-xl);
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-header h3 {
    flex: 1;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
}

.history-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: var(--spacing-4);
}

.history-item {
    padding: var(--spacing-3);
    background: var(--color-bg-elevated);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: center;
    position: relative;
}

.history-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.history-item:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.history-item img {
    width: 100%;
    height: 100px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-2);
}

.history-item p {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    margin-bottom: 0.25rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.history-item small {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

.history-delete {
    position: absolute;
    top: 4px;
    right: 4px;
    background: rgba(0, 0, 0, 0.6);
    border: none;
    color: white;
    border-radius: 50%;
    width: 22px;
    height: 22px;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-base), background var(--transition-base);
}

.history-item:hover .history-delete {
    opacity: 1;
}

.history-delete:hover {
    background: var(--color-danger);
    transform: scale(1.1);
}

.history-delete:focus-visible {
    outline: 2px solid white;
    outline-offset: 2px;
}

/* ===== 21. FOOTER ===== */
footer {
    background: var(--color-bg-card);
    margin-top: var(--spacing-16);
    border-top: 1px solid var(--color-border-light);
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-12) var(--spacing-8);
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-12);
}

.footer-logo i {
    font-size: var(--font-size-3xl);
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-logo span {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
}

.footer-tagline {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    margin-top: var(--spacing-2);
}

.footer-links {
    display: flex;
    gap: var(--spacing-16);
    flex-wrap: wrap;
}

.footer-column h4 {
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-4);
    color: var(--color-text-primary);
    font-weight: var(--font-weight-semibold);
}

.footer-column a {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    text-decoration: none;
    margin-bottom: var(--spacing-2);
    transition: color var(--transition-fast), transform var(--transition-fast);
}

.footer-column a:hover {
    color: var(--color-accent);
    transform: translateX(4px);
}

.footer-column a:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.footer-tech {
    display: flex;
    gap: var(--spacing-4);
    align-items: center;
    flex-wrap: wrap;
}

.tech-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--font-size-xs);
    padding: var(--spacing-2) var(--spacing-4);
    background: var(--color-bg-elevated);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.tech-badge:hover {
    transform: translateY(-2px);
    background: var(--color-accent);
    color: white;
}

.tech-badge:hover i {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding: var(--spacing-4);
    border-top: 1px solid var(--color-border-light);
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

.footer-bottom i {
    color: var(--color-danger);
    animation: pulse 1.5s infinite;
}

/* ===== 22. LOADING OVERLAY ===== */
#loadingOverlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-bg-overlay);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: var(--z-modal);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* ===== 23. TOAST CONTAINER ===== */
#toastContainer {
    position: fixed;
    bottom: var(--spacing-4);
    right: var(--spacing-4);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
    max-width: 400px;
    width: 100%;
    pointer-events: none;
}

#toastContainer .toast {
    pointer-events: auto;
    background: var(--color-text-primary);
    color: white;
    padding: var(--spacing-3) var(--spacing-5);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    box-shadow: var(--shadow-lg);
    animation: slideInRight 0.3s ease;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    transition: opacity var(--transition-base), transform var(--transition-base);
}

#toastContainer .toast.toast-success {
    background: var(--color-success);
}
#toastContainer .toast.toast-error {
    background: var(--color-danger);
}
#toastContainer .toast.toast-warning {
    background: var(--color-warning);
}
#toastContainer .toast.toast-info {
    background: var(--color-accent);
}

#toastContainer .toast:focus-visible {
    outline: 2px solid rgba(255, 255, 255, 0.8);
    outline-offset: 2px;
}

/* ===== 24. URL ZONE ===== */
.url-zone {
    border: 2px solid var(--color-border-light);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-12) var(--spacing-8);
    text-align: center;
    transition: all var(--transition-base);
    background: var(--color-bg-card);
    animation: fadeIn 0.6s ease-out;
}

.url-zone:hover {
    border-color: var(--color-accent-light);
    box-shadow: var(--shadow-md);
}

.url-icon i {
    font-size: 4rem;
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-4);
}

.url-zone h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-2);
}

.url-zone p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-6);
}

.url-input-group {
    display: flex;
    gap: var(--spacing-4);
    max-width: 600px;
    margin: 0 auto;
}

.url-input {
    flex: 1;
    padding: var(--spacing-3) var(--spacing-5);
    border: 2px solid var(--color-border-light);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    background: var(--color-bg-input);
    color: var(--color-text-primary);
    transition: all var(--transition-fast);
}

.url-input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: var(--focus-ring);
}

.url-note {
    font-size: var(--font-size-xs);
    margin-top: var(--spacing-4);
    color: var(--color-text-tertiary);
}

.url-examples {
    margin-top: var(--spacing-6);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-3);
    flex-wrap: wrap;
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

.example-btn {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-full);
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-xs);
    cursor: pointer;
    transition: all var(--transition-base);
    color: var(--color-text-secondary);
}

.example-btn:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
    transform: translateY(-2px);
}

.example-btn:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* ===== 25. PROCESSING GRID ===== */
.processing-grid {
    display: grid;
    grid-template-columns: 1fr 0.9fr;
    gap: var(--spacing-8);
    margin-bottom: var(--spacing-12);
}

.preview-card,
.controls-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    animation: fadeIn 0.6s ease-out;
}

.preview-card:hover,
.controls-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-2xl);
}

.canvas-wrapper {
    position: relative;
    background: var(--color-bg-elevated);
    padding: var(--spacing-4);
    text-align: center;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: auto;
}

.preview-canvas {
    max-width: 100%;
    height: auto;
    object-fit: contain;
    cursor: crosshair;
    transition: transform var(--transition-fast);
    border-radius: var(--radius-sm);
}

.zoom-controls {
    position: absolute;
    bottom: var(--spacing-4);
    right: var(--spacing-4);
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-full);
    padding: var(--spacing-2);
    display: flex;
    gap: var(--spacing-1);
}

.zoom-controls button {
    background: transparent;
    border: none;
    color: white;
    cursor: pointer;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    transition: background var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.zoom-controls button:hover {
    background: rgba(255, 255, 255, 0.2);
}

.zoom-controls button:focus-visible {
    outline: 2px solid white;
    outline-offset: 2px;
}

.zoom-controls span {
    color: white;
    min-width: 50px;
    text-align: center;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    line-height: 32px;
}

.image-info {
    padding: var(--spacing-4) var(--spacing-6);
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border-light);
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-2) 0;
    font-size: var(--font-size-sm);
}

.info-row span:first-child {
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
}

.info-row .info-value {
    color: var(--color-text-primary);
    font-weight: var(--font-weight-semibold);
}

/* ===== 26. FORMAT BUTTONS ===== */
.format-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-3);
}

.format-btn {
    padding: var(--spacing-3);
    border: 2px solid var(--color-border-light);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-1);
    user-select: none;
}

.format-btn i {
    font-size: var(--font-size-base);
}

.format-btn .format-badge {
    font-size: var(--font-size-xs);
    background: var(--color-accent);
    color: white;
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-full);
    margin-top: var(--spacing-1);
}

.format-btn.active {
    background: var(--color-accent-gradient);
    border-color: transparent;
    color: white;
    transform: scale(1.02);
}

.format-btn:hover:not(.active) {
    border-color: var(--color-accent);
    transform: translateY(-2px);
}

.format-btn:active:not(.active) {
    transform: scale(0.98);
}

.format-btn:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.format-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* ===== 27. SLIDER LABELS ===== */
.slider-container {
    padding: var(--spacing-2) 0;
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    margin-top: var(--spacing-3);
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

/* ===== 28. QUALITY BADGE ===== */
.badge-quality {
    margin-left: auto;
    font-size: var(--font-size-xs);
    padding: var(--spacing-1) var(--spacing-2);
    border-radius: var(--radius-full);
    background: var(--color-bg-elevated);
    color: var(--color-accent);
    font-weight: var(--font-weight-semibold);
}

.size-preview {
    margin-top: var(--spacing-3);
    padding: var(--spacing-2) var(--spacing-3);
    background: var(--color-bg-elevated);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.size-preview i {
    color: var(--color-accent);
}

.size-compare {
    margin-left: auto;
    font-size: var(--font-size-xs);
    color: var(--color-success);
}

/* ===== 29. RESIZE PANEL ===== */
.resize-panel {
    margin-top: var(--spacing-4);
    padding: var(--spacing-4);
    background: var(--color-bg-elevated);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.resize-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
}

.option-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.option-row label {
    margin-bottom: 0;
    min-width: 60px;
    font-weight: var(--font-weight-medium);
}

.option-row select {
    flex: 1;
    padding: var(--spacing-2) var(--spacing-3);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-sm);
    background: var(--color-bg-input);
    color: var(--color-text-primary);
    cursor: pointer;
    font-size: var(--font-size-sm);
}

.dimension-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-1);
}

.input-group label {
    margin-bottom: 0;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
}

.input-group input {
    padding: var(--spacing-2) var(--spacing-3);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-sm);
    background: var(--color-bg-input);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
}

.input-group .unit {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

.preset-title {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    margin-top: var(--spacing-2);
    color: var(--color-text-secondary);
}

.preset-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-2);
    margin-top: var(--spacing-2);
}

.preset-btn {
    padding: var(--spacing-2) var(--spacing-4);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    cursor: pointer;
    transition: all var(--transition-base);
    user-select: none;
}

.preset-btn:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
    transform: translateY(-2px);
}

.preset-btn:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* ===== 30. FILTER BUTTONS ===== */
.filter-buttons {
    display: flex;
    gap: var(--spacing-2);
    flex-wrap: wrap;
}

.filter-btn {
    padding: var(--spacing-2) var(--spacing-4);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: var(--font-size-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    user-select: none;
}

.filter-btn i {
    font-size: var(--font-size-sm);
}

.filter-btn.active {
    background: var(--color-accent-gradient);
    border-color: transparent;
    color: white;
    transform: scale(1.05);
}

.filter-btn:hover:not(.active) {
    border-color: var(--color-accent);
    transform: translateY(-2px);
}

.filter-btn:active:not(.active) {
    transform: scale(0.98);
}

.filter-btn:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* ===== 31. RESPONSIVE ===== */
@media (max-width: 1024px) {
    .processing-grid {
        grid-template-columns: 1fr;
    }

    .nav-links {
        gap: var(--spacing-4);
    }

    .hero h1 {
        font-size: var(--font-size-4xl);
    }

    .hero-stats {
        gap: var(--spacing-8);
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
        align-items: center;
    }

    .footer-links {
        justify-content: center;
    }

    .footer-tech {
        justify-content: center;
    }

    .format-buttons {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .btn-text {
        display: none;
    }

    .hero {
        padding: calc(72px + var(--spacing-8)) var(--spacing-4) var(--spacing-8);
    }

    .hero h1 {
        font-size: var(--font-size-3xl);
    }

    .hero p {
        font-size: var(--font-size-base);
    }

    .hero-stats {
        gap: var(--spacing-4);
    }

    .tool-container {
        padding: 0 var(--spacing-4);
    }

    .drop-zone {
        padding: var(--spacing-12) var(--spacing-4);
    }

    .input-tabs {
        justify-content: center;
        gap: var(--spacing-2);
    }

    .tab-btn {
        padding: var(--spacing-2) var(--spacing-4);
        font-size: var(--font-size-sm);
    }

    .batch-stats {
        gap: var(--spacing-4);
        justify-content: center;
    }

    .batch-actions {
        flex-direction: column;
    }

    .batch-actions .btn-convert {
        width: 100%;
        margin: 0;
    }

    .shortcuts-content {
        gap: var(--spacing-2);
    }

    .shortcuts-content span:not(:first-child) {
        display: none;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .history-grid {
        grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    }

    .url-input-group {
        flex-direction: column;
    }

    .dimension-inputs {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: var(--font-size-2xl);
    }

    .hero-stats .stat .number {
        font-size: var(--font-size-2xl);
    }

    .tab-btn span {
        display: none;
    }

    .tab-btn i {
        font-size: var(--font-size-xl);
        margin: 0;
    }

    .btn-convert {
        font-size: var(--font-size-sm);
        padding: var(--spacing-3);
        width: calc(100% - var(--spacing-8));
        margin: var(--spacing-3) var(--spacing-4);
    }

    .footer-content {
        padding: var(--spacing-8) var(--spacing-4);
    }

    .footer-links {
        gap: var(--spacing-8);
    }

    .format-buttons {
        grid-template-columns: 1fr 1fr;
    }

    .batch-header {
        flex-direction: column;
        align-items: stretch;
    }

    .batch-header-actions {
        justify-content: center;
    }
}

/* ===== 32. PRINT STYLES ===== */
@media print {
    .navbar,
    .hero,
    .drop-zone,
    .url-zone,
    .input-tabs,
    .batch-panel,
    .features-section,
    footer,
    .zoom-controls,
    .shortcuts-info,
    .controls-card {
        display: none !important;
    }

    .processing-grid {
        display: block !important;
    }

    .preview-canvas {
        max-width: 100% !important;
    }

    body {
        background: white !important;
        color: black !important;
    }
}