/* ============================================
   MAIN STYLESHEET
   ============================================ */

/* ========== Global Resets ========== */

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: var(--leading-normal);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========== Typography ========== */

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-display);
    font-weight: var(--font-bold);
    line-height: var(--leading-tight);
    margin-bottom: var(--space-2);
}

h1 {
    font-size: var(--text-5xl);
    font-weight: var(--font-extrabold);
}

h2 {
    font-size: var(--text-4xl);
}

h3 {
    font-size: var(--text-3xl);
}

h4 {
    font-size: var(--text-2xl);
}

h5 {
    font-size: var(--text-xl);
}

h6 {
    font-size: var(--text-lg);
}

p {
    margin-bottom: var(--space-2);
    color: var(--color-text-secondary);
}

a {
    color: var(--color-ai-cyan);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-ai-purple);
}

/* ========== Layout ========== */

.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.container-wide {
    width: 100%;
    max-width: 1536px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.section {
    padding: var(--space-12) 0;
    position: relative;
}

.section-sm {
    padding: var(--space-8) 0;
}

.section-lg {
    padding: var(--space-16) 0;
}

/* ========== Grid System ========== */

.grid {
    display: grid;
    gap: var(--space-4);
}

.grid-cols-1 {
    grid-template-columns: repeat(1, 1fr);
}

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

.grid-cols-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-cols-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* ========== Flexbox Utilities ========== */

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.items-center {
    align-items: center;
}

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

.justify-between {
    justify-content: space-between;
}

.gap-1 {
    gap: var(--space-1);
}

.gap-2 {
    gap: var(--space-2);
}

.gap-3 {
    gap: var(--space-3);
}

.gap-4 {
    gap: var(--space-4);
}

.gap-6 {
    gap: var(--space-6);
}

.gap-8 {
    gap: var(--space-8);
}

/* ========== Navigation ========== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
    padding: var(--space-3) 0;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: var(--glass-bg-strong);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-bottom: 1px solid var(--glass-border);
    box-shadow: var(--shadow-lg);
}

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

.logo {
    font-size: var(--text-2xl);
    font-weight: var(--font-extrabold);
    font-family: var(--font-display);
    background: var(--gradient-ai-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: var(--space-6);
    list-style: none;
}

.nav-link {
    color: var(--color-text-secondary);
    font-weight: var(--font-medium);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-ai-primary);
    transition: width var(--transition-base);
}

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

.nav-link:hover::after {
    width: 100%;
}

.nav-link.active {
    color: var(--color-ai-cyan);
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-1);
}

.menu-toggle span {
    width: 28px;
    height: 3px;
    background: var(--gradient-ai-primary);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

/* ========== Hero Section ========== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding-top: var(--space-12);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
}

.hero-title {
    font-size: var(--text-6xl);
    font-weight: var(--font-extrabold);
    margin-bottom: var(--space-4);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: var(--text-xl);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
    line-height: var(--leading-relaxed);
}

/* ========== Buttons ========== */

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    text-decoration: none;
    font-family: var(--font-primary);
}

.btn-primary {
    background: var(--gradient-ai-primary);
    color: var(--color-text-primary);
    box-shadow: var(--shadow-glow-cyan);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow-cyan), var(--shadow-xl);
}

.btn-secondary {
    background: var(--glass-bg-strong);
    color: var(--color-text-primary);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(var(--glass-blur));
}

.btn-secondary:hover {
    background: var(--glass-bg);
    border-color: var(--color-ai-cyan);
    box-shadow: var(--shadow-glow-cyan);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-lg);
}

/* ========== Cards ========== */

.card {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    padding: var(--space-6);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--gradient-ai-primary);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.card:hover {
    transform: translateY(-8px);
    border-color: var(--color-ai-cyan);
    box-shadow: var(--shadow-glow-cyan), var(--shadow-xl);
}

.card:hover::before {
    opacity: 1;
}

.card-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-ai-primary);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-3);
    font-size: var(--text-3xl);
}

.card-title {
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    margin-bottom: var(--space-2);
    color: var(--color-text-primary);
}

.card-description {
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
}

/* ========== Section Headers ========== */

.section-header {
    text-align: center;
    margin-bottom: var(--space-10);
}

.section-title {
    font-size: var(--text-5xl);
    font-weight: var(--font-extrabold);
    margin-bottom: var(--space-3);
}

.section-subtitle {
    font-size: var(--text-xl);
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

/* ========== Responsive Design ========== */

@media (max-width: 1024px) {
    h1 {
        font-size: var(--text-4xl);
    }

    .hero-title {
        font-size: var(--text-5xl);
    }

    .section-title {
        font-size: var(--text-4xl);
    }

    .grid-cols-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    .grid-cols-3 {
        grid-template-columns: repeat(2, 1fr);
    }
}

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

    .menu-toggle {
        display: flex;
    }

    .nav-links.mobile-active {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        background: var(--glass-bg-strong);
        backdrop-filter: blur(var(--glass-blur));
        padding: var(--space-4);
        border-bottom: 1px solid var(--glass-border);
    }

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

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

    .section-title {
        font-size: var(--text-3xl);
    }

    .grid-cols-2,
    .grid-cols-3,
    .grid-cols-4 {
        grid-template-columns: 1fr;
    }

    .section {
        padding: var(--space-8) 0;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    .container {
        padding: 0 var(--space-2);
    }

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

    .btn-lg {
        padding: var(--space-3) var(--space-5);
        font-size: var(--text-base);
    }
}

/* ========== Scroll Animations ========== */

.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.scroll-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

.scroll-reveal-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.scroll-reveal-left.revealed {
    opacity: 1;
    transform: translateX(0);
}

.scroll-reveal-right {
    opacity: 0;
    transform: translateX(50px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.scroll-reveal-right.revealed {
    opacity: 1;
    transform: translateX(0);
}

/* Stagger animation delays */
.scroll-reveal:nth-child(1) {
    transition-delay: 0ms;
}

.scroll-reveal:nth-child(2) {
    transition-delay: 100ms;
}

.scroll-reveal:nth-child(3) {
    transition-delay: 200ms;
}

.scroll-reveal:nth-child(4) {
    transition-delay: 300ms;
}

.scroll-reveal:nth-child(5) {
    transition-delay: 400ms;
}

.scroll-reveal:nth-child(6) {
    transition-delay: 500ms;
}