:root {
    /* Color Palette */
    --primary: #3b82f6;
    --primary-rgb: 59, 130, 246;
    --primary-bg: #0a0a0c;
    --secondary-bg: #141418;
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --accent-gold: #f59e0b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.1);

    /* Gradation */
    --grad-main: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    --grad-surface: linear-gradient(180deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0) 100%);
    --grad-premium: linear-gradient(135deg, #f59e0b, #fbbf24);
    --grad-expiring: linear-gradient(135deg, #ef4444, #f87171);

    /* Animation */
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);

    /* Profile & Admin Gradients */
    --profile-gradient: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    --accent-gradient: linear-gradient(90deg, #3b82f6 0%, #2dd4bf 100%);
    --admin-gradient: linear-gradient(90deg, #f59e0b 0%, #fef3c7 100%);
}

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

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

.mobile-only {
    display: none !important;
}

.desktop-only {
    display: block !important;
}

@media (max-width: 768px) {
    .mobile-only {
        display: block !important;
    }

    .desktop-only {
        display: none !important;
    }
}

/* Typography */
h1 {
    font-size: clamp(2.2rem, 8vw, 4rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    word-break: keep-all;
}

h2 {
    font-size: clamp(1.8rem, 5vw, 2.5rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
    word-break: keep-all;
}

h3 {
    font-weight: 700;
    letter-spacing: -0.02em;
    word-break: keep-all;
}

p {
    word-break: keep-all;
    color: var(--text-muted);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    width: 100%;
}

/* Hero Section */
.hero {
    padding: 12rem 0 8rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

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

.tag {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent-blue);
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero p {
    font-size: clamp(1.1rem, 2vw, 1.25rem);
    max-width: 700px;
    margin: 0 auto 3rem;
}

.hero-btns {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 4rem;
}

.hero-image {
    width: 100%;
    max-width: 900px;
    border-radius: 24px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    border: 1px solid var(--glass-border);
}

@media (max-width: 768px) {
    .hero { padding: 8rem 0 4rem; }
    .hero-btns { flex-direction: column; }
    .hero-btns .btn { width: 100%; }
}

/* Education Section */
#education {
    padding: 8rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.edu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.edu-card {
    background: var(--secondary-bg);
    border-radius: 24px;
    padding: 2.5rem;
    border: 1px solid var(--glass-border);
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
}

.edu-card:hover {
    transform: translateY(-10px);
    border-color: var(--accent-blue);
    background: rgba(255, 255, 255, 0.04);
}

.edu-card img {
    width: 100%;
    aspect-ratio: 16/10;
    object-fit: cover;
    border-radius: 16px;
    margin-bottom: 2rem;
}

.edu-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.edu-card p {
    margin-bottom: 2rem;
    flex-grow: 1;
}

.btn-text {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-blue);
    font-weight: 700;
    text-decoration: none;
    transition: var(--transition-smooth);
}

.btn-text:hover {
    gap: 0.8rem;
}

/* AI Studio Section */
#studio {
    padding: 8rem 0;
    background: linear-gradient(to bottom, transparent, rgba(59, 130, 246, 0.03), transparent);
}

.wf-container {
    background: var(--secondary-bg);
    border-radius: 32px;
    padding: 4rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    border: 1px solid var(--glass-border);
}

.wf-visual {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.wf-step {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 20px;
    border: 1px solid transparent;
    transition: var(--transition-smooth);
}

.wf-step.active {
    background: rgba(59, 130, 246, 0.1);
    border-color: rgba(59, 130, 246, 0.3);
    transform: translateX(10px);
}

.wf-step i {
    width: 48px;
    height: 48px;
    background: rgba(59, 130, 246, 0.2);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-blue);
}

@media (max-width: 992px) {
    .wf-container { grid-template-columns: 1fr; gap: 3rem; padding: 2.5rem; }
}

/* Automation Section */
#automation {
    padding: 8rem 0;
}

.auto-container {
    margin-top: 4rem;
}

.studio-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-item {
    background: var(--secondary-bg);
    padding: 3rem 2rem;
    border-radius: 24px;
    border: 1px solid var(--glass-border);
    transition: var(--transition-smooth);
    text-align: center;
}

.feature-item:hover {
    border-color: var(--accent-purple);
    transform: translateY(-5px);
}

.feature-item i {
    width: 64px;
    height: 64px;
    margin-bottom: 2rem;
    color: var(--accent-purple);
}

/* About Section */
.about-section {
    padding: 8rem 0;
}

.brand-story-content {
    padding: 4rem 2rem;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.brand-story-content p {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--text-main);
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 4rem;
}

.value-card {
    background: var(--secondary-bg);
    padding: 3rem 2rem;
    border-radius: 24px;
    border: 1px solid var(--glass-border);
    text-align: center;
}

.value-icon-wrapper {
    margin-bottom: 2rem;
}

/* Header & Nav */
header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 10001;
    padding: 1.5rem 0;
    transition: var(--transition-smooth);
}

header.scrolled {
    background: rgba(10, 10, 12, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 1rem 0;
    border-bottom: 1px solid var(--glass-border);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: var(--text-main);
}

.logo-brand {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.5rem;
    font-weight: 800;
}

.highlight-gd {
    background: var(--grad-main);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-subtitle {
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    list-style: none;
    align-items: center;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition-smooth);
}

.nav-links a:hover {
    color: var(--text-main);
}

.nav-actions {
    display: flex;
    gap: 1rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.8rem 1.8rem;
    border-radius: 12px;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition-smooth);
    text-decoration: none;
    font-size: 0.95rem;
}

.btn-primary {
    background: var(--grad-main);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(59, 130, 246, 0.3);
}

.btn.glass {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    color: white;
}

.btn.glass:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: white;
}

.btn-sm {
    padding: 0.5rem 1.2rem;
    font-size: 0.85rem;
}

/* Mobile Menu */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--primary-bg);
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        border-bottom: 1px solid var(--glass-border);
    }

    .nav-links.active {
        display: flex;
    }

    .mobile-menu-btn {
        display: block;
    }

    .nav-actions.desktop-only {
        display: none !important;
    }
}

/* Utils */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
}

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease-out;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

.skeleton-loading {
    visibility: hidden;
    pointer-events: none;
}

/* Scroll Top Button */
#scrollTopBtn {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--grad-main);
    border: none;
    border-radius: 50%;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-smooth);
    z-index: 999;
}

#scrollTopBtn.show {
    opacity: 1;
    visibility: visible;
}

/* Footer */
footer {
    padding: 6rem 0 3rem;
    border-top: 1px solid var(--glass-border);
    background: #050505;
}

.footer-slogan {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 3rem;
    color: var(--text-main);
}

.footer-content-wrapper {
    display: flex;
    justify-content: space-between;
    gap: 4rem;
    margin-bottom: 4rem;
}

.footer-business-info p {
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-icon {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: var(--transition-smooth);
}

.social-icon:hover {
    background: var(--accent-blue);
    color: white;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    padding-top: 2rem;
    border-top: 1px solid var(--glass-border);
    font-size: 0.85rem;
    color: var(--text-muted);
}

@media (max-width: 768px) {
    .footer-content-wrapper { flex-direction: column; gap: 2rem; }
    .footer-bottom { flex-direction: column; gap: 1rem; text-align: center; }
}