/* ==========================================================================
   Template: Syncflow - Real-time Collaboration Platform
   Version: 1.0.0
   Inspired by: Linear, Notion
   ========================================================================== */

:root {
    /* Brand Colors - Purple/Blue Modern */
    --primary: #8b5cf6;
    --primary-light: #a78bfa;
    --primary-dark: #7c3aed;
    --secondary: #3b82f6;
    --accent: #ec4899;
    --success: #22c55e;
    --warning: #eab308;
    --error: #ef4444;

    /* Dark Theme */
    --bg-primary: #0a0a0b;
    --bg-secondary: #111113;
    --bg-tertiary: #1a1a1f;
    --bg-elevated: #222228;

    --text-primary: #f5f5f7;
    --text-secondary: #9ca3af;
    --text-tertiary: #6b7280;
    --text-muted: #4b5563;

    --border-primary: #1f1f24;
    --border-secondary: #2d2d35;
    --border-focus: var(--primary);

    /* Typography */
    --text-hero: clamp(3rem, 8vw, 5.5rem);
    --text-display: clamp(2.25rem, 5vw, 3.5rem);
    --text-h1: clamp(1.875rem, 4vw, 2.5rem);
    --text-h2: clamp(1.5rem, 3vw, 2rem);
    --text-h3: clamp(1.25rem, 2vw, 1.5rem);
    --text-body: 1rem;
    --text-small: 0.875rem;
    --text-xs: 0.75rem;

    /* 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;
    --space-32: 8rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.25rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 50px rgba(139, 92, 246, 0.25);
    --shadow-glow-lg: 0 0 80px rgba(139, 92, 246, 0.3);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 500ms cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #fafafa;
    --bg-tertiary: #f4f4f5;
    --bg-elevated: #ffffff;
    --text-primary: #18181b;
    --text-secondary: #52525b;
    --text-tertiary: #71717a;
    --border-primary: #e4e4e7;
    --border-secondary: #d4d4d8;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

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

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(10, 10, 11, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-primary);
}

[data-theme="light"] .nav {
    background: rgba(255, 255, 255, 0.85);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    padding: 0 var(--space-6);
    max-width: 1280px;
    margin: 0 auto;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.nav-links {
    display: none;
    gap: var(--space-8);
}

@media (min-width: 768px) {
    .nav-links { display: flex; }
}

.nav-link {
    font-size: var(--text-small);
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-size: var(--text-small);
    font-weight: 500;
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-base);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 14px rgba(139, 92, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-secondary);
}

.btn-secondary:hover {
    background: var(--bg-elevated);
    border-color: var(--border-focus);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

.btn-ghost:hover {
    color: var(--text-primary);
}

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

.btn-icon {
    padding: var(--space-2);
}

/* Container */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.section { padding: var(--space-24) 0; }
.section-lg { padding: var(--space-32) 0; }

/* Hero */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-gradient {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
}

.hero-gradient-1 {
    width: 600px;
    height: 600px;
    top: -100px;
    right: -100px;
    background: var(--primary);
}

.hero-gradient-2 {
    width: 500px;
    height: 500px;
    bottom: -100px;
    left: 10%;
    background: var(--secondary);
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(139, 92, 246, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(139, 92, 246, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, black 20%, transparent 100%);
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-full);
    font-size: var(--text-small);
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
}

.hero-badge-new {
    padding: var(--space-1) var(--space-2);
    background: var(--primary);
    color: white;
    font-size: var(--text-xs);
    font-weight: 600;
    border-radius: var(--radius-sm);
}

.hero-title {
    font-size: var(--text-hero);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-6);
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 650px;
    margin: 0 auto var(--space-10);
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    flex-wrap: wrap;
    margin-bottom: var(--space-16);
}

.hero-image {
    position: relative;
    margin-top: var(--space-12);
}

.hero-mockup {
    border-radius: var(--radius-2xl);
    border: 1px solid var(--border-primary);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
    overflow: hidden;
    background: var(--bg-secondary);
}

/* Cards */
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    transition: all var(--transition-base);
}

.card:hover {
    border-color: var(--border-secondary);
}

.card-feature {
    position: relative;
}

.card-feature:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: var(--space-6);
}

@media (min-width: 768px) {
    .features-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
    .features-grid { grid-template-columns: repeat(3, 1fr); }
}

.feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-4);
}

.feature-icon svg {
    width: 24px;
    height: 24px;
    color: white;
}

.feature-title {
    font-size: var(--text-h3);
    font-weight: 600;
    margin-bottom: var(--space-3);
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Gradient Text */
.text-gradient {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Footer */
.footer {
    border-top: 1px solid var(--border-primary);
    padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-8);
    margin-bottom: var(--space-12);
}

@media (min-width: 768px) {
    .footer-grid { grid-template-columns: 2fr repeat(3, 1fr); }
}

.footer-brand { grid-column: span 2; }
@media (min-width: 768px) { .footer-brand { grid-column: span 1; } }

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    margin-bottom: var(--space-4);
}

.footer-description {
    color: var(--text-secondary);
    font-size: var(--text-small);
    max-width: 280px;
}

.footer-title {
    font-weight: 600;
    margin-bottom: var(--space-4);
}

.footer-links { list-style: none; }

.footer-link {
    display: block;
    padding: var(--space-2) 0;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--text-small);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    padding-top: var(--space-8);
    border-top: 1px solid var(--border-primary);
}

@media (min-width: 768px) {
    .footer-bottom { flex-direction: row; justify-content: space-between; align-items: center; }
}

.footer-copyright {
    font-size: var(--text-small);
    color: var(--text-tertiary);
}

/* Animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.stagger-1 { transition-delay: 0.1s; }
.stagger-2 { transition-delay: 0.2s; }
.stagger-3 { transition-delay: 0.3s; }
.stagger-4 { transition-delay: 0.4s; }
.stagger-5 { transition-delay: 0.5s; }
.stagger-6 { transition-delay: 0.6s; }

.hover-lift {
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.hover-lift:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* Utilities */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

::selection {
    background: var(--primary);
    color: white;
}

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--border-secondary); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
    .reveal { opacity: 1; transform: none; }
}

/* Pricing */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: var(--space-6);
    max-width: 1000px;
    margin: 0 auto;
}

@media (min-width: 768px) {
    .pricing-grid { grid-template-columns: repeat(3, 1fr); }
}

.pricing-card {
    position: relative;
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
}

.pricing-card.featured {
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    padding: var(--space-1) var(--space-4);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    font-size: var(--text-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
}

.pricing-name {
    font-size: var(--text-h3);
    font-weight: 600;
    margin-bottom: var(--space-2);
}

.pricing-description {
    font-size: var(--text-small);
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
}

.pricing-price {
    display: flex;
    align-items: baseline;
    gap: var(--space-1);
    margin-bottom: var(--space-6);
}

.pricing-amount {
    font-size: 3rem;
    font-weight: 700;
}

.pricing-period {
    color: var(--text-tertiary);
}

.pricing-features {
    list-style: none;
    margin-bottom: var(--space-8);
}

.pricing-feature {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) 0;
    font-size: var(--text-small);
    color: var(--text-secondary);
}

.pricing-feature svg {
    width: 16px;
    height: 16px;
    color: var(--success);
    flex-shrink: 0;
}