/* ===================================
   FRENCH FILTER - Modern Design 2025
   =================================== */

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* Variables CSS */
:root {
    /* Couleurs principales */
    --primary: #4F46E5;
    --primary-light: #6366F1;
    --primary-dark: #4338CA;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-accent: linear-gradient(135deg, #4F46E5 0%, #06b6d4 100%);
    --gradient-soft: linear-gradient(135deg, #667eea15 0%, #764ba215 100%);

    /* Mode clair */
    --bg-primary: #F8FAFC;
    --bg-secondary: #FFFFFF;
    --bg-tertiary: #F1F5F9;
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-tertiary: #94A3B8;
    --border: #E2E8F0;
    --shadow: rgba(15, 23, 42, 0.08);
    --shadow-lg: rgba(15, 23, 42, 0.15);

    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.18);
    --glass-shadow: rgba(31, 38, 135, 0.1);

    /* Autres */
    --radius: 16px;
    --radius-sm: 8px;
    --radius-lg: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Mode sombre */
body.dark-theme {
    --bg-primary: #0F172A;
    --bg-secondary: #1E293B;
    --bg-tertiary: #334155;
    --text-primary: #F8FAFC;
    --text-secondary: #CBD5E1;
    --text-tertiary: #64748B;
    --border: #334155;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-lg: rgba(0, 0, 0, 0.5);

    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: rgba(0, 0, 0, 0.3);
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Background animé subtil */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(79, 70, 229, 0.03) 0%, transparent 50%);
    animation: rotate 30s linear infinite;
    pointer-events: none;
    z-index: -1;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===================================
   HEADER
   =================================== */
header {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    padding: 24px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 20px var(--glass-shadow);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
    gap: 12px;
}

header h1 i {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: 2rem;
}

.controls {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

/* Language Selector */
.language-selector {
    display: flex;
    gap: 8px;
    padding: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.language-selector a {
    transition: var(--transition);
    display: block;
    border-radius: 4px;
    padding: 4px;
}

.language-selector img {
    width: 20px;
    height: 20px;
    display: block;
    border-radius: 3px;
    transition: var(--transition);
}

.language-selector a:hover {
    background: var(--bg-secondary);
    transform: translateY(-2px);
}

/* Theme Toggle */
#theme-toggle {
    background: var(--gradient-accent);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(79, 70, 229, 0.3);
}

#theme-toggle:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
}

#theme-toggle i {
    font-size: 1.1rem;
}

/* ===================================
   MAIN CONTENT
   =================================== */
main {
    padding: 40px 0 80px;
}

/* Sections */
section {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-bottom: 32px;
    box-shadow: 0 10px 40px var(--glass-shadow);
    transition: var(--transition);
}

section:hover {
    transform: translateY(-4px);
    box-shadow: 0 15px 50px var(--shadow-lg);
}

section h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-primary);
}

section h2 i {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: 1.5rem;
}

/* Description Section */
#description-section p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 1.05rem;
}

#description-section ul {
    list-style: none;
    margin: 24px 0;
}

#description-section ul li {
    padding: 12px 0 12px 36px;
    position: relative;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition);
}

#description-section ul li::before {
    content: "\f058";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    position: absolute;
    left: 0;
    color: var(--primary);
    font-size: 1.2rem;
}

#description-section ul li:hover {
    color: var(--text-primary);
    padding-left: 40px;
}

/* ===================================
   FORMS & INPUTS
   =================================== */
#upload-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.file-input, .url-input {
    position: relative;
}

.file-input input[type="file"] {
    display: none;
}

.file-input label, .url-input label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.file-input label[for="m3u-file"] {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 32px;
    background: var(--gradient-soft);
    border: 2px dashed var(--primary);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
    color: var(--primary);
    width: 100%;
    justify-content: center;
}

.file-input label[for="m3u-file"]:hover {
    background: var(--gradient-primary);
    color: white;
    border-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(79, 70, 229, 0.3);
}

.file-input label[for="m3u-file"] i {
    font-size: 1.5rem;
}

.url-input input[type="url"],
#search-input {
    width: 100%;
    padding: 16px 20px;
    background: var(--bg-secondary);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
    color: var(--text-primary);
    transition: var(--transition);
    font-family: inherit;
}

.url-input input[type="url"]:focus,
#search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

/* Buttons */
button[type="submit"],
.btn-submit {
    background: var(--gradient-accent);
    color: white;
    border: none;
    padding: 16px 40px;
    border-radius: var(--radius);
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    box-shadow: 0 8px 25px rgba(79, 70, 229, 0.35);
    width: 100%;
}

button[type="submit"]:hover,
.btn-submit:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(79, 70, 229, 0.5);
}

button[type="submit"]:active,
.btn-submit:active {
    transform: translateY(-1px);
}

.btn-select-all {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 2px solid var(--border);
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-select-all:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-2px);
}

.buttons {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

/* ===================================
   CATEGORIES & CHANNELS
   =================================== */
#search-input {
    margin-bottom: 24px;
}

.categories-container {
    max-height: 60vh;
    overflow-y: auto;
    padding: 16px;
    background: var(--bg-tertiary);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

/* Scrollbar personnalisée */
.categories-container::-webkit-scrollbar {
    width: 10px;
}

.categories-container::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 10px;
}

.categories-container::-webkit-scrollbar-thumb {
    background: var(--gradient-accent);
    border-radius: 10px;
}

.categories-container::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

#categories-list {
    list-style: none;
}

.category-item {
    background: var(--bg-secondary);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 12px;
    transition: var(--transition);
}

.category-item:hover {
    border-color: var(--primary);
    transform: translateX(4px);
    box-shadow: 0 4px 20px var(--shadow);
}

.category-item label {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-primary);
}

.category-item input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--primary);
}

.channel-count {
    color: var(--primary);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    border-bottom: 2px solid transparent;
}

.channel-count:hover {
    color: var(--primary-dark);
    border-bottom-color: var(--primary);
}

.channel-list {
    list-style: none;
    margin: 16px 0 0 32px;
    padding: 16px;
    background: var(--bg-tertiary);
    border-left: 3px solid var(--primary);
    border-radius: var(--radius-sm);
    display: none;
}

.channel-item {
    padding: 8px 12px;
    color: var(--text-secondary);
    transition: var(--transition);
    border-radius: var(--radius-sm);
}

.channel-item:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding-left: 16px;
}

.submit-container {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 2px solid var(--border);
}

/* ===================================
   FOOTER
   =================================== */
footer {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--glass-border);
    padding: 20px 0;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    z-index: 99;
    box-shadow: 0 -4px 20px var(--glass-shadow);
}

footer .container {
    text-align: center;
}

footer p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
}

/* ===================================
   ERROR MESSAGES
   =================================== */
.error {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    color: #991b1b;
    padding: 16px 20px;
    border-radius: var(--radius);
    border-left: 4px solid #dc2626;
    margin-top: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
}

.dark-theme .error {
    background: linear-gradient(135deg, #7f1d1d 0%, #991b1b 100%);
    color: #fecaca;
}

.error i {
    font-size: 1.2rem;
}

/* ===================================
   ANIMATIONS
   =================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

section {
    animation: fadeInUp 0.6s ease-out;
}

/* ===================================
   CHANNEL SELECTION
   =================================== */
.category-header {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.category-header > label {
    width: 100%;
}

.channel-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    padding-left: 32px;
}

.btn-mini {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-mini:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-1px);
}

.channel-counter {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary);
    padding: 4px 12px;
    background: var(--gradient-soft);
    border-radius: 12px;
}

.channel-list {
    margin-top: 12px;
}

.channel-item label {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.channel-item label:hover {
    background: var(--bg-secondary);
}

.channel-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary);
    flex-shrink: 0;
}

.channel-item span {
    flex: 1;
}

/* ===================================
   RESPONSIVE
   =================================== */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        text-align: center;
    }

    header h1 {
        font-size: 1.5rem;
    }

    .controls {
        width: 100%;
        justify-content: center;
    }

    section {
        padding: 24px 20px;
        border-radius: var(--radius);
    }

    section h2 {
        font-size: 1.5rem;
    }

    .buttons {
        flex-direction: column;
    }

    .btn-select-all {
        width: 100%;
    }

    .categories-container {
        max-height: 50vh;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    header h1 {
        font-size: 1.25rem;
    }

    section {
        padding: 20px 16px;
    }

    button[type="submit"],
    .btn-submit {
        padding: 14px 28px;
        font-size: 1rem;
    }
}