/* YTMP3.Chat - Modern Enhanced Theme */
:root {
    /* Modern Color Palette - Ocean Theme */
    --primary-teal: #0d9488;
    --primary-cyan: #0891b2;
    --primary-blue: #2563eb;
    --primary-indigo: #4f46e5;
    --primary-violet: #7c3aed;
    
    --secondary-teal: #14b8a6;
    --secondary-cyan: #22d3ee;
    --secondary-blue: #3b82f6;
    --secondary-indigo: #6366f1;
    --secondary-violet: #a855f7;
    
    --accent-emerald: #059669;
    --accent-green: #16a34a;
    --accent-lime: #65a30d;
    --accent-orange: #ea580c;
    
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --dark: #020617;
    
    /* Modern Gradients - Ocean Theme */
    --gradient-primary: linear-gradient(135deg, var(--primary-teal) 0%, var(--primary-cyan) 50%, var(--primary-blue) 100%);
    --gradient-secondary: linear-gradient(135deg, var(--secondary-teal) 0%, var(--secondary-cyan) 50%, var(--secondary-blue) 100%);
    --gradient-accent: linear-gradient(135deg, var(--accent-emerald) 0%, var(--accent-green) 50%, var(--accent-lime) 100%);
    --gradient-dark: linear-gradient(135deg, var(--gray-800) 0%, var(--gray-900) 50%, var(--dark) 100%);
    --gradient-light: linear-gradient(135deg, var(--white) 0%, var(--gray-50) 50%, var(--gray-100) 100%);
    
    /* Modern Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 20px rgba(13, 148, 136, 0.3);
    --shadow-glow-cyan: 0 0 20px rgba(8, 145, 178, 0.3);
    --shadow-glow-blue: 0 0 20px rgba(37, 99, 235, 0.3);
    
    /* Modern Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Modern Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
    
    /* Modern Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    
    /* Modern Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--gray-700);
    background: var(--gradient-light);
    min-height: 100vh;
    overflow-x: hidden;
}

@keyframes backgroundFloat {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -30px) rotate(120deg); }
    66% { transform: translate(-20px, 20px) rotate(240deg); }
}

/* Modern Navbar */
.navbar {
    background: rgba(255, 255, 255, 0.95) !important;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding: var(--space-4) 0;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.navbar-brand img {
    height: 50px;
    width: auto;
    transition: transform var(--transition-normal);
}

.navbar-brand img:hover {
    transform: scale(1.05);
}

.navbar-nav .nav-link {
    color: var(--gray-700) !important;
    font-weight: 500;
    padding: var(--space-3) var(--space-4) !important;
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
    position: relative;
    margin: 0 var(--space-1);
}

.navbar-nav .nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: all var(--transition-normal);
    transform: translateX(-50%);
    border-radius: var(--radius-full);
}

.navbar-nav .nav-link:hover::before {
    width: 80%;
}

.navbar-nav .nav-link:hover {
    color: var(--primary-teal) !important;
    background: rgba(13, 148, 136, 0.1);
    transform: translateY(-2px);
}

.navbar-nav .nav-link.active {
    color: var(--primary-teal) !important;
    background: rgba(13, 148, 136, 0.15);
    font-weight: 600;
}

/* Modern Language Menu */
.simple-language-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: var(--space-2);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-normal);
    z-index: 1000;
}

@keyframes dropdownSlide {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.simple-language-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    animation: dropdownSlide var(--transition-normal) ease-out;
}

.language-link {
    display: flex;
    align-items: center;
    padding: var(--space-3) var(--space-4);
    color: var(--gray-700);
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
    font-weight: 500;
}

.language-link:hover {
    background: rgba(13, 148, 136, 0.1);
    color: var(--primary-teal);
    transform: translateX(5px);
}

.nav-item {
    position: relative;
}

/* Modern Gradient Backgrounds */
.bg-purple {
    background: var(--gradient-primary) !important;
    position: relative;
    /* overflow: hidden; */
    box-shadow: var(--shadow-lg);
}

.bg-purple::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 25% 25%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
    animation: shimmer 3s ease-in-out infinite;
}

/* Ensure navbar text is visible on gradient background */
.navbar.bg-purple .navbar-nav .nav-link {
    color: rgba(255, 255, 255, 0.9) !important;
    font-weight: 500;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.navbar.bg-purple .navbar-nav .nav-link:hover {
    color: var(--white) !important;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.navbar.bg-purple .navbar-brand {
    color: var(--white) !important;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.navbar.bg-purple .navbar-toggler {
    border-color: rgba(255, 255, 255, 0.5);
}

.navbar.bg-purple .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 0.9%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

@keyframes shimmer {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

/* Modern Button Styling */
.btn-primary {
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-xl);
    padding: var(--space-4) var(--space-8);
    font-weight: 600;
    font-size: var(--font-size-base);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
    color: var(--white);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    min-height: 48px;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-secondary);
    transition: left var(--transition-normal);
    z-index: -1;
}

.btn-primary:hover::before {
    left: 0;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-2xl), var(--shadow-glow);
    color: var(--white);
    text-decoration: none;
}

.btn-primary:active {
    transform: translateY(-1px);
}

.btn-outline-primary {
    background: transparent;
    border: 2px solid var(--primary-teal);
    border-radius: var(--radius-xl);
    padding: var(--space-4) var(--space-8);
    font-weight: 600;
    color: var(--primary-teal);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    min-height: 48px;
}

.btn-outline-primary:hover {
    background: var(--gradient-primary);
    border-color: transparent;
    color: var(--white);
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.btn-light {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border: none;
    border-radius: var(--radius-xl);
    padding: var(--space-4) var(--space-8);
    font-weight: 600;
    color: var(--gray-700);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-lg);
    min-height: 48px;
}

.btn-light:hover {
    background: var(--white);
    transform: translateY(-3px);
    box-shadow: var(--shadow-2xl);
}

/* Modern Card Styling */
.card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-2xl);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    position: relative;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-2xl);
    border-color: rgba(13, 148, 136, 0.3);
}

.card-body {
    padding: var(--space-8);
}

/* Modern Feature Cards */
.feature-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    text-align: center;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
    height: 100%;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-2xl);
}

.feature-card i {
    font-size: 3rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-4);
    display: block;
}

/* Modern Form Controls */
.form-control {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-xl);
    padding: var(--space-4) var(--space-5);
    font-size: var(--font-size-base);
    transition: all var(--transition-normal);
    color: var(--gray-700);
    min-height: 48px;
}

.form-control::placeholder {
    color: var(--gray-400);
}

.form-control:focus {
    background: var(--white);
    border-color: var(--primary-teal);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.1);
    outline: none;
}

.form-select {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-xl);
    padding: var(--space-4) var(--space-5);
    font-size: var(--font-size-base);
    transition: all var(--transition-normal);
    min-height: 48px;
}

.form-select:focus {
    background: var(--white);
    border-color: var(--primary-teal);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.1);
    outline: none;
}

.accordion-button {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border: none;
    border-radius: var(--radius-lg);
    padding: var(--space-4) var(--space-5);
    font-weight: 600;
    color: var(--gray-700);
    transition: all var(--transition-normal);
}

.accordion-button:not(.collapsed) {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: var(--shadow-lg);
}

.accordion-button:focus {
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.1);
}

.accordion-body {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    padding: var(--space-5);
    color: var(--gray-600);
}

/* Modern Text Utilities */
.text-primary {
    color: var(--primary-teal) !important;
}

.bg-primary {
    background: var(--gradient-primary) !important;
}

/* Modern Footer */
footer {
    background: var(--gradient-dark);
    color: var(--gray-300);
    padding: var(--space-16) 0 var(--space-8);
    position: relative;
    overflow: hidden;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--gradient-primary);
}

footer a {
    color: var(--gray-300);
    text-decoration: none;
    transition: all var(--transition-normal);
}

footer a:hover {
    color: var(--white);
    text-decoration: none;
}

/* Modern Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1.2;
}

.display-4 {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.1;
}

.lead {
    font-size: var(--font-size-xl);
    font-weight: 400;
    color: var(--gray-600);
    line-height: 1.6;
}

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

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

.fade-in-up {
    animation: fadeInUp var(--transition-slow) ease-out;
}

.fade-in-left {
    animation: fadeInLeft var(--transition-slow) ease-out;
}

.fade-in-right {
    animation: fadeInRight var(--transition-slow) ease-out;
}

/* Modern Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gradient-secondary);
}

/* Modern Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--white);
    animation: spin 1s ease-in-out infinite;
}

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

/* Modern Glass Effect */
.glass-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-xl);
}

/* Modern Hover Effects */
.hover-lift {
    transition: transform var(--transition-normal);
}

.hover-lift:hover {
    transform: translateY(-5px);
}

/* Modern Text Gradients */
.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.text-success {
    color: var(--accent-emerald) !important;
}

.text-danger {
    color: var(--accent-rose) !important;
}

/* Modern Dropdown Styling */
.dropdown-menu {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: var(--space-2);
}

.dropdown-item {
    border-radius: var(--radius-lg);
    padding: var(--space-3) var(--space-4);
    transition: all var(--transition-normal);
    color: var(--gray-700);
}

.dropdown-item:hover {
    background: rgba(13, 148, 136, 0.1);
    color: var(--primary-teal);
    transform: translateX(5px);
}

/* Modern Input Groups */
.input-group {
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.input-group .form-control {
    border-radius: var(--radius-xl) 0 0 var(--radius-xl);
}

.input-group .btn {
    border-radius: 0 var(--radius-xl) var(--radius-xl) 0;
}

/* Modern Alerts */
.alert {
    border: none;
    border-radius: var(--radius-xl);
    padding: var(--space-4) var(--space-5);
    backdrop-filter: blur(10px);
}

.alert-success {
    background: rgba(5, 150, 105, 0.1);
    color: var(--accent-emerald);
    border-left: 4px solid var(--accent-emerald);
}

.alert-danger {
    background: rgba(244, 63, 94, 0.1);
    color: var(--accent-rose);
    border-left: 4px solid var(--accent-rose);
}

/* Modern Progress Bars */
.progress {
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    height: 8px;
    overflow: hidden;
}

.progress-bar {
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-normal);
}

/* Modern Responsive Design */
@media (max-width: 768px) {
    .display-4 {
        font-size: var(--font-size-4xl);
    }
    
    .lead {
        font-size: var(--font-size-lg);
    }
    
    .navbar-brand img {
        height: 40px;
    }
    
    .feature-card {
        padding: var(--space-6);
    }
    
    .card {
        margin-bottom: var(--space-6);
    }
    
    .navbar-nav .dropdown-menu {
        position: static !important;
        float: none;
        width: auto;
        margin-top: 0;
        background-color: transparent;
        border: 0;
        box-shadow: none;
    }
}

@media (max-width: 991.98px) {
    .navbar-collapse {
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(20px);
        border-radius: var(--radius-xl);
        margin-top: var(--space-4);
        padding: var(--space-4);
        box-shadow: var(--shadow-lg);
    }
    
    .navbar-nav .nav-link {
        margin: var(--space-1) 0;
        text-align: center;
    }
}

/* Modern Focus States */
.btn:focus,
.form-control:focus,
.form-select:focus {
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.1);
    outline: none;
}

/* Modern Selection */
::selection {
    background: rgba(13, 148, 136, 0.2);
    color: var(--gray-900);
}

::-moz-selection {
    background: rgba(13, 148, 136, 0.2);
    color: var(--gray-900);
}

/* Modern Print Styles */
@media print {
    .navbar,
    .btn,
    .dropdown-menu {
        display: none !important;
    }
    
    body {
        background: var(--white) !important;
        color: var(--gray-900) !important;
    }
    
    .card {
        box-shadow: none !important;
        border: 1px solid var(--gray-200) !important;
    }
}