/* ═══════════════════════════════════════════════════
   UrbanFlow — Design System
   A handcrafted, editorial-grade landing page.
   ═══════════════════════════════════════════════════ */

/* ─── Design Tokens ─── */
:root {
    --c-bg:         #0c0c0e;
    --c-bg-warm:    #111113;
    --c-surface:    #1a1a1e;
    --c-border:     rgba(255, 255, 255, 0.06);
    --c-text:       #e8e6e3;
    --c-text-dim:   #7a7876;
    --c-text-muted: #4a4845;
    --c-accent:     #c8ff00;
    --c-accent-dim: rgba(200, 255, 0, 0.12);
    --c-teal:       #3dffd2;
    --c-warm:       #ff9f43;

    --f-serif:      'Playfair Display', Georgia, 'Times New Roman', serif;
    --f-sans:       'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;

    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);

    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 8rem;
    --space-2xl: 12rem;

    --radius: 16px;
    --radius-lg: 24px;
}

/* ─── Reset ─── */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    background: var(--c-bg);
    color: var(--c-text);
    font-family: var(--f-sans);
    font-size: 16px;
    line-height: 1.7;
    overflow-x: hidden;
    cursor: none;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    display: block;
}

ul {
    list-style: none;
}

em {
    font-family: var(--f-serif);
    font-style: italic;
    color: var(--c-accent);
}

::selection {
    background: var(--c-accent);
    color: var(--c-bg);
}

/* ─── Film Grain Overlay ─── */
.grain {
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 9999;
    animation: grain 0.5s steps(1) infinite;
}

@keyframes grain {
    0%, 100% { transform: translate(0, 0) }
    10% { transform: translate(-5%, -10%) }
    20% { transform: translate(-15%, 5%) }
    30% { transform: translate(7%, -25%) }
    40% { transform: translate(-5%, 25%) }
    50% { transform: translate(-15%, 10%) }
    60% { transform: translate(15%, 0%) }
    70% { transform: translate(0%, 15%) }
    80% { transform: translate(3%, 35%) }
    90% { transform: translate(-10%, 10%) }
}

/* ─── Custom Cursor ─── */
.cursor-dot {
    width: 6px;
    height: 6px;
    background: var(--c-accent);
    border-radius: 50%;
    position: fixed;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 10000;
    transform: translate(-50%, -50%);
    transition: width 0.2s, height 0.2s, background 0.2s;
}

.cursor-ring {
    width: 40px;
    height: 40px;
    border: 1.5px solid rgba(200, 255, 0, 0.3);
    border-radius: 50%;
    position: fixed;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 10000;
    transform: translate(-50%, -50%);
    transition: width 0.3s var(--ease-out-expo), 
                height 0.3s var(--ease-out-expo), 
                border-color 0.3s;
}

.cursor-dot.hovering {
    width: 12px;
    height: 12px;
    background: var(--c-teal);
}

.cursor-ring.hovering {
    width: 60px;
    height: 60px;
    border-color: rgba(61, 255, 210, 0.3);
}

/* ─── Navigation ─── */
#main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem clamp(2rem, 5vw, 4rem);
    z-index: 100;
    transition: all 0.4s var(--ease-out-expo);
}

#main-nav.scrolled {
    padding: 1rem clamp(2rem, 5vw, 4rem);
    background: rgba(12, 12, 14, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--c-border);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    font-size: 1.1rem;
    letter-spacing: -0.02em;
}

.logo-mark {
    color: var(--c-accent);
    font-size: 1.2rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2.5rem;
}

.nav-link {
    font-size: 0.875rem;
    color: var(--c-text-dim);
    transition: color 0.3s;
    letter-spacing: 0.02em;
}

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

.nav-link--cta {
    color: var(--c-accent);
    font-weight: 500;
}

.nav-link--cta:hover {
    color: var(--c-teal);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 200;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 1.5px;
    background: var(--c-text);
    transition: all 0.3s var(--ease-out-expo);
    transform-origin: center;
}

.nav-toggle.active span:first-child {
    transform: rotate(45deg) translate(2.5px, 2.5px);
}

.nav-toggle.active span:last-child {
    transform: rotate(-45deg) translate(2.5px, -2.5px);
}

.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--c-bg);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    z-index: 99;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s var(--ease-out-expo);
}

.mobile-menu.active {
    opacity: 1;
    pointer-events: all;
}

.mobile-link {
    font-size: 2rem;
    font-weight: 300;
    color: var(--c-text-dim);
    transition: color 0.3s;
}

.mobile-link:hover {
    color: var(--c-accent);
}

/* ─── Hero Section ─── */
#hero {
    position: relative;
    height: 100vh;
    min-height: 700px;
    display: flex;
    align-items: flex-end;
    padding: 0 clamp(2rem, 5vw, 4rem) clamp(4rem, 8vh, 8rem);
    overflow: hidden;
}

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

.hero-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center 40%;
    transform: scale(1.1);
    transition: transform 8s var(--ease-out-expo);
}

body.loaded .hero-img {
    transform: scale(1);
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background: 
        linear-gradient(to top, var(--c-bg) 0%, rgba(12,12,14,0.7) 40%, rgba(12,12,14,0.2) 70%, rgba(12,12,14,0.4) 100%),
        linear-gradient(to right, var(--c-bg) 0%, transparent 50%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
}

.hero-eyebrow {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--c-accent);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

h1 {
    font-family: var(--f-sans);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 600;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
}

.hero-line {
    display: block;
}

.hero-body {
    font-size: clamp(1rem, 1.5vw, 1.2rem);
    color: var(--c-text-dim);
    max-width: 540px;
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 1.5rem;
    align-items: center;
    flex-wrap: wrap;
}

/* ─── Buttons ─── */
.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 2rem;
    border: 1px solid var(--c-accent);
    color: var(--c-accent);
    border-radius: 100px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.4s var(--ease-out-expo);
    letter-spacing: 0.01em;
}

.btn-outline:hover {
    background: var(--c-accent);
    color: var(--c-bg);
    transform: translateY(-2px);
    box-shadow: 0 10px 40px rgba(200, 255, 0, 0.2);
}

.btn-ghost {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 0;
    color: var(--c-text-dim);
    font-size: 0.9rem;
    font-weight: 400;
    transition: color 0.3s;
}

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

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.1rem 2.5rem;
    background: var(--c-accent);
    color: var(--c-bg);
    border-radius: 100px;
    font-size: 0.95rem;
    font-weight: 600;
    transition: all 0.4s var(--ease-out-expo);
    letter-spacing: -0.01em;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 50px rgba(200, 255, 0, 0.25);
}

.btn-primary svg {
    transition: transform 0.3s var(--ease-out-expo);
}

.btn-primary:hover svg {
    transform: translate(3px, -3px);
}

/* ─── Scroll Indicator ─── */
.scroll-indicator {
    position: absolute;
    right: clamp(2rem, 5vw, 4rem);
    bottom: clamp(2rem, 5vh, 4rem);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    z-index: 2;
}

.scroll-line {
    width: 1px;
    height: 60px;
    background: linear-gradient(to bottom, var(--c-accent), transparent);
    animation: scroll-pulse 2s ease-in-out infinite;
}

@keyframes scroll-pulse {
    0%, 100% { opacity: 1; transform: scaleY(1); }
    50% { opacity: 0.3; transform: scaleY(0.6); transform-origin: top; }
}

/* ─── About Section ─── */
.section-about {
    padding: var(--space-2xl) clamp(2rem, 5vw, 4rem);
    border-top: 1px solid var(--c-border);
}

.about-container {
    max-width: 800px;
    margin: 0 auto;
}

.about-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--c-text-muted);
    margin-bottom: 2rem;
}

.about-heading {
    font-family: var(--f-sans);
    font-size: clamp(2rem, 4vw, 3.2rem);
    font-weight: 600;
    line-height: 1.25;
    letter-spacing: -0.02em;
    margin-bottom: 3rem;
}

.about-body {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.about-body p {
    color: var(--c-text-dim);
    font-size: 1.05rem;
    line-height: 1.85;
}

/* ─── Capabilities Section ─── */
.section-caps {
    padding: var(--space-xl) clamp(2rem, 5vw, 4rem) var(--space-2xl);
}

.cap-header {
    max-width: 1200px;
    margin: 0 auto var(--space-xl);
}

.cap-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--c-text-muted);
}

.cap-block {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(2rem, 5vw, 6rem);
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-lg) 0;
    border-top: 1px solid var(--c-border);
}

.cap-block--reverse {
    direction: rtl;
}

.cap-block--reverse > * {
    direction: ltr;
}

.cap-visual {
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
}

.cap-visual img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    transition: transform 0.8s var(--ease-out-expo);
}

.cap-visual:hover img {
    transform: scale(1.05);
}

.cap-visual::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, transparent 60%, rgba(12,12,14,0.5) 100%);
    pointer-events: none;
}

.cap-number {
    display: block;
    font-size: 0.8rem;
    color: var(--c-accent);
    font-weight: 500;
    margin-bottom: 1rem;
    letter-spacing: 0.05em;
}

.cap-title {
    font-size: clamp(1.5rem, 3vw, 2.2rem);
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

.cap-desc {
    color: var(--c-text-dim);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.cap-details {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.cap-details li {
    color: var(--c-text-dim);
    font-size: 0.9rem;
    padding-left: 1.25rem;
    position: relative;
}

.cap-details li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--c-accent);
    font-size: 0.8rem;
}

/* ─── Metrics Section ─── */
.section-metrics {
    padding: var(--space-2xl) clamp(2rem, 5vw, 4rem);
    background: var(--c-bg-warm);
    border-top: 1px solid var(--c-border);
    border-bottom: 1px solid var(--c-border);
}

.metrics-inner {
    max-width: 1200px;
    margin: 0 auto;
}

.metrics-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--c-text-muted);
    margin-bottom: var(--space-xl);
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.metric {
    text-align: left;
}

.metric-value {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 600;
    letter-spacing: -0.03em;
    line-height: 1;
    margin-bottom: 0.75rem;
    color: var(--c-text);
    font-variant-numeric: tabular-nums;
}

.metric-label {
    font-size: 0.85rem;
    color: var(--c-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* ─── Tech Stack Section ─── */
.section-stack {
    padding: var(--space-2xl) clamp(2rem, 5vw, 4rem);
}

.stack-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(3rem, 6vw, 8rem);
    align-items: start;
}

.stack-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--c-text-muted);
    margin-bottom: 2rem;
}

.stack-heading {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 1.5rem;
}

.stack-desc {
    color: var(--c-text-dim);
    line-height: 1.8;
}

.stack-items {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.stack-item {
    padding: 2rem;
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    transition: all 0.4s var(--ease-out-expo);
}

.stack-item:hover {
    border-color: var(--c-accent);
    transform: translateY(-4px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.stack-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.stack-name {
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

.stack-role {
    font-size: 0.8rem;
    color: var(--c-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* ─── Footer ─── */
.section-footer {
    padding: var(--space-2xl) clamp(2rem, 5vw, 4rem) var(--space-lg);
    text-align: center;
}

.footer-content {
    max-width: 600px;
    margin: 0 auto var(--space-xl);
}

.footer-heading {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 600;
    letter-spacing: -0.03em;
    margin-bottom: 1rem;
}

.footer-body {
    color: var(--c-text-dim);
    font-size: 1.1rem;
    margin-bottom: 2.5rem;
}

.footer-bottom {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.8rem;
    color: var(--c-text-muted);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--c-border);
}

.footer-bottom a {
    color: var(--c-text-dim);
    transition: color 0.3s;
}

.footer-bottom a:hover {
    color: var(--c-accent);
}

.footer-dot {
    opacity: 0.3;
}

/* ─── Reveal Animations ─── */
.reveal-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s var(--ease-out-expo), 
                transform 0.8s var(--ease-out-expo);
}

.reveal-scale {
    opacity: 0;
    transform: scale(0.95);
    transition: opacity 0.8s var(--ease-out-expo), 
                transform 0.8s var(--ease-out-expo);
}

.reveal-up.visible,
.reveal-scale.visible {
    opacity: 1;
    transform: translateY(0) scale(1);
}

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }

/* ─── Responsive ─── */
@media (max-width: 1024px) {
    .cap-block,
    .cap-block--reverse {
        grid-template-columns: 1fr;
        direction: ltr;
    }

    .cap-visual img {
        height: 300px;
    }

    .stack-container {
        grid-template-columns: 1fr;
    }

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

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

    .nav-toggle {
        display: flex;
    }

    #hero {
        min-height: 600px;
        padding-bottom: 3rem;
    }

    h1 {
        font-size: clamp(2rem, 8vw, 3rem);
    }

    .hero-body {
        font-size: 1rem;
    }

    .cap-visual img {
        height: 250px;
    }

    .stack-items {
        grid-template-columns: 1fr;
    }

    .metrics-grid {
        grid-template-columns: 1fr 1fr;
    }

    .cursor-dot,
    .cursor-ring {
        display: none;
    }

    body {
        cursor: auto;
    }
}

@media (max-width: 480px) {
    .metrics-grid {
        grid-template-columns: 1fr;
    }

    .hero-actions {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* ─── Smooth Page Load ─── */
body:not(.loaded) .hero-content > * {
    opacity: 0;
    transform: translateY(30px);
}

body.loaded .hero-content > * {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.8s var(--ease-out-expo), 
                transform 0.8s var(--ease-out-expo);
}

body.loaded .hero-eyebrow { transition-delay: 0.3s; }
body.loaded h1 { transition-delay: 0.5s; }
body.loaded .hero-body { transition-delay: 0.7s; }
body.loaded .hero-actions { transition-delay: 0.9s; }
body.loaded .scroll-indicator { transition-delay: 1.3s; }