:root {
    --primary-color: #f97316;
    --secondary-color: #fb923c;
    --dark-bg: #4b5563;
    --light-bg: #f8fafc;
    --text-color: #4b5563;
    --card-bg: #ffffff;
    --feature-bg: #f8fafc;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

body.dark-theme {
    --primary-color: #c2410c;
    --secondary-color: #ea580c;
    --dark-bg: #0f172a;
    --light-bg: #1e293b;
    --text-color: #e2e8f0;
    --card-bg: #334155;
    --feature-bg: #0f172a;
}

body.dark-theme .feature-section {
    background: var(--feature-bg);
}

body.dark-theme .feature-card {
    background: var(--card-bg);
    color: var(--text-color);
}

body.dark-theme .demo-section {
    background: var(--light-bg);
}

body.dark-theme .text-muted {
    color: #94a3b8 !important;
}

body.dark-theme h2 {
    color: #f1f5f9;
}

.text-featured {
    color: #3e3e3e !important;
}

.text-muted {
    color: #dfe4eb !important;
}

code {
    font-size: .875em;
    color: #cc7f2d !important;
    word-wrap: break-word;
}

.text-custom {
    opacity: 0.9;
    font-size: 0.9rem;
}

.theme-switch-wrapper {
    position: fixed;
    right: 20px;
    z-index: 998;
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.95);
    padding: 10px 20px;
    border-radius: 50px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

body.dark-theme .theme-switch-wrapper {
    background: rgba(51, 65, 85, 0.95);
}

.theme-switch {
    display: inline-block;
    height: 28px;
    position: relative;
    width: 50px;
    margin: 0 10px;
}

.theme-switch input {
    display: none;
}

.slider {
    background-color: #cbd5e1;
    bottom: 0;
    cursor: pointer;
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
    transition: 0.4s;
    border-radius: 34px;
}

.slider:before {
    background-color: #fff;
    bottom: 4px;
    content: "";
    height: 20px;
    left: 4px;
    position: absolute;
    transition: 0.4s;
    width: 20px;
    border-radius: 50%;
}

input:checked + .slider {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

input:checked + .slider:before {
    transform: translateX(22px);
}

.theme-icon {
    font-size: 1.2rem;
    transition: all 0.3s ease;
}

body.dark-theme .theme-icon {
    color: #e2e8f0;
}

.navbar {
    background: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 999;
    transition: background 0.3s ease;
}

body.dark-theme .navbar {
    background: #1e293b;
}

.navbar .container {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary-color) !important;
    order: 1;
    text-decoration: none;
}

.navbar-toggler {
    order: 2;
    margin-left: 15px;
    border: none;
    padding: 8px;
}

.navbar-toggler:focus {
    box-shadow: none;
}

.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(75, 85, 99, 1)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

body.dark-theme .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(226, 232, 240, 1)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

.navbar-collapse {
    order: 3;
    flex-basis: 100%;
}

.navbar-nav {
    margin-left: 0;
}

.nav-link {
    color: var(--text-color) !important;
    margin: 0 10px;
    transition: all 0.3s ease;
}

.nav-link:hover {
    color: var(--primary-color) !important;
}

.nav-link i {
    font-size: 1.3rem;
}

.nav-link .fa-heart {
    color: #e74c3c;
}

.nav-link:hover .fa-heart {
    color: #c0392b;
    transform: scale(1.1);
}

.dropdown-menu {
    background: white;
    border: none;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    border-radius: 8px;
    padding: 10px 0;
}

body.dark-theme .dropdown-menu {
    background: #334155;
}

.dropdown-item {
    color: var(--text-color);
    padding: 10px 20px;
    transition: all 0.3s ease;
}

.dropdown-item:hover {
    background: rgba(249, 115, 22, 0.1);
    color: var(--primary-color);
}

body.dark-theme .dropdown-item {
    color: #e2e8f0;
}

body.dark-theme .dropdown-item:hover {
    background: rgba(249, 115, 22, 0.1);
}

@media (max-width: 991px) {
    .icon-only {
        display: none;
    }
    .theme-switch-wrapper {
        top: 80px;
    }
}

@media (min-width: 992px) {
    .navbar-collapse {
        flex-basis: auto;
    }
    .navbar-nav {
        margin-left: auto;
    }
    .text-only {
        display: none;
    }
    .icon-only {
        display: inline-block;
    }
    .theme-switch-wrapper {
        top: 20px;
    }
}

.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 100px 0;
    position: relative;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 0;
    transition: opacity 1.5s ease-in-out;
    background-size: cover;
    background-position: center;
}

.hero-background.active {
    opacity: 0.3;
}

.hero-background-1 {
    background-image: url('https://images.unsplash.com/photo-1618401471353-b98afee0b2eb?w=1920&q=80');
}

.hero-background-2 {
    background-image: url('https://images.unsplash.com/photo-1555066931-4365d14bab8c?w=1920&q=80');
}

.hero-background-3 {
    background-image: url('https://images.unsplash.com/photo-1542831371-29b0f74f9713?w=1920&q=80');
}

.hero-background-4 {
    background-image: url('https://images.unsplash.com/photo-1498050108023-c5249f4df085?w=1920&q=80');
}

.hero-background-5 {
    background-image: url('https://images.unsplash.com/photo-1517694712202-14dd9538aa97?w=1920&q=80');
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(249, 115, 22, 0.8) 0%, rgba(251, 146, 60, 0.8) 100%);
    z-index: 1;
    transition: background 0.3s ease;
}

body.dark-theme .hero-overlay {
    background: linear-gradient(135deg, rgba(194, 65, 12, 0.8) 0%, rgba(234, 88, 12, 0.8) 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    opacity: 0;
    transform: translateY(30px);
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    opacity: 0;
    transform: translateY(30px);
}

.hero-buttons {
    opacity: 0;
    transform: translateY(30px);
}

.btn-hero {
    padding: 15px 40px;
    font-size: 1.1rem;
    border-radius: 50px;
    margin: 0 10px;
    transition: all 0.3s ease;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-primary-custom {
    background: white;
    color: var(--primary-color);
    border: none;
}

.btn-primary-custom:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.3);
    background: #4b5563;
    color: white;
}

body.dark-theme .btn-primary-custom:hover {
    background: #1e293b;
    box-shadow: 0 15px 35px rgba(0,0,0,0.5);
}

.btn-outline-custom {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-outline-custom:hover {
    background: white;
    color: var(--primary-color);
    transform: translateY(-3px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.3);
}

body.dark-theme .btn-outline-custom:hover {
    box-shadow: 0 15px 35px rgba(0,0,0,0.5);
}

.feature-section {
    padding: 80px 0;
    background: var(--light-bg);
}

.feature-row {
    margin-bottom: 30px;
}

.feature-card {
    background: white;
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(30px);
    margin-bottom: 30px;
    height: 100%;
    min-height: 280px;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.15);
}

.feature-icon {
    font-size: 3rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1.5rem;
}

.demo-section {
    padding: 80px 0;
    background: white;
}

.code-block {
    background: var(--dark-bg);
    color: #e2e8f0;
    padding: 30px;
    border-radius: 10px;
    font-family: 'Courier New', monospace;
    position: relative;
    opacity: 0;
    transform: translateX(-30px);
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.code-block::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 30px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 10px 10px 0 0;
}

body.dark-theme .code-block::before {
    background: #1e293b;
}

.code-content {
    margin-top: 20px;
}

.demo-preview {
    opacity: 0;
    transform: translateX(30px);
    height: 100%;
}

.demo-preview-card {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    padding: 40px;
    border-radius: 15px;
    color: white;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    height: 100%;
    display: flex;
    flex-direction: column;
    transition: background 0.3s ease;
}

.demo-preview-content {
    background: rgba(255,255,255,0.1);
    border-radius: 10px;
    padding: 20px;
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    flex-grow: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.demo-preview-img {
    width: 100%;
    height: auto;
    max-height: 200px;
    object-fit: cover;
    border-radius: 8px;
    display: block;
}

.stats-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--dark-bg) 0%, #64748b 100%);
    color: white;
}

body.dark-theme .stats-section {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
}

.stat-card {
    text-align: center;
    padding: 30px;
    opacity: 0;
    transform: scale(0.8);
}

.stat-icon {
    font-size: 3rem;
    margin-bottom: 15px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    display: block;
    margin-bottom: 10px;
}

.stat-label {
    font-size: 1.1rem;
    opacity: 0.8;
}

.cta-section {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    text-align: center;
}

.footer {
    background: var(--dark-bg);
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 30px;
    margin-bottom: 30px;
}

.footer-social {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 30px;
}

.footer-social a {
    color: white;
    font-size: 1.5rem;
    transition: all 0.3s ease;
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
}

.footer-social a:hover {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    transform: translateY(-3px);
}

.footer-links {
    text-align: center;
    margin-bottom: 20px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    margin: 0 15px;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: white;
}

.footer-copyright {
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    line-height: 1.8;
}

.footer-copyright a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
}

.footer-copyright a:hover {
    color: white;
}

body.dark-theme .footer {
    background: #0a0f1e;
}

.yagc-logo {
  display: inline-block;
  width: 24px;
  height: 20px;
  background-image: url("/images/yagc-ico.png");
  background-repeat: no-repeat;
  background-size: 24px auto;
}

.github-icon {
    font-size: 2rem;
    color: white;
    transition: all 0.3s ease;
}

.github-icon:hover {
    transform: scale(1.2) rotate(360deg);
}

.footer-brand {
    font-weight: 700;
    color: white;
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    .hero-subtitle {
        font-size: 1.2rem;
    }
    .btn-hero {
        margin: 10px 0;
        display: block;
        width: 100%;
    }
    .footer-links a {
        display: block;
        margin: 10px 0;
    }
    .navbar-collapse {
        background: white;
        padding: 20px;
        border-radius: 10px;
        margin-top: 15px;
        box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    }
    body.dark-theme .navbar-collapse {
        background: #334155;
    }
    .nav-item {
        margin: 5px 0;
    }
    .dropdown-menu {
        border: none;
        box-shadow: none;
        padding-left: 15px;
        background: transparent !important;
    }
    .dropdown-item {
        padding: 8px 15px;
        font-size: 0.95rem;
    }
}