/* ==========================================================================
   Smoko Labs — Shared Design System
   ========================================================================== */

/* --- Google Fonts (must be first rule) --- */
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;1,9..40,300;1,9..40,400&family=Instrument+Serif:ital@0;1&family=JetBrains+Mono:wght@300;400;500&display=swap');

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

/* ==========================================================================
   Design Tokens — Light Mode (default)
   ========================================================================== */
:root {
    --bg-primary: #F5F0E8;
    --bg-secondary: #FAF7F2;
    --bg-dark: #1A1815;
    --text-primary: #1A1815;
    --text-secondary: #5A554D;
    --text-meta: #8B7D5E;
    --accent: #C4572A;
    --accent-light: #D4734A;
    --teal: #3A7D6E;
    --border: #D5CFC3;
    --surface: #FAF7F2;
    --logo-stroke: #1A1815;
    --logo-text: #1A1815;
}

/* ==========================================================================
   System Dark Mode
   ========================================================================== */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #1A1815;
        --bg-secondary: #22201C;
        --text-primary: #F5F0E8;
        --text-secondary: #A89A7B;
        --text-meta: #A89A7B;
        --border: rgba(245, 240, 232, 0.1);
        --surface: rgba(255, 255, 255, 0.04);
        --logo-stroke: #F5F0E8;
        --logo-text: #F5F0E8;
    }
}

/* ==========================================================================
   Manual Theme Overrides
   ========================================================================== */
[data-theme="light"] {
    --bg-primary: #F5F0E8;
    --bg-secondary: #FAF7F2;
    --text-primary: #1A1815;
    --text-secondary: #5A554D;
    --text-meta: #8B7D5E;
    --border: #D5CFC3;
    --surface: #FAF7F2;
    --logo-stroke: #1A1815;
    --logo-text: #1A1815;
}

[data-theme="dark"] {
    --bg-primary: #1A1815;
    --bg-secondary: #22201C;
    --text-primary: #F5F0E8;
    --text-secondary: #A89A7B;
    --text-meta: #A89A7B;
    --border: rgba(245, 240, 232, 0.1);
    --surface: rgba(255, 255, 255, 0.04);
    --logo-stroke: #F5F0E8;
    --logo-text: #F5F0E8;
}

/* ==========================================================================
   Base Body Styles
   ========================================================================== */
body {
    font-family: 'DM Sans', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.6;
}

/* ==========================================================================
   Typography Utilities
   ========================================================================== */
.font-serif {
    font-family: 'Instrument Serif', serif;
}

.font-mono {
    font-family: 'JetBrains Mono', monospace;
}

/* ==========================================================================
   Shared Section Styles
   ========================================================================== */
.section-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.section-label::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}

.section-title {
    font-family: 'Instrument Serif', serif;
    font-size: clamp(1.8rem, 3.5vw, 2.6rem);
    font-weight: 400;
    line-height: 1.25;
    margin-bottom: 0.75rem;
}

.section-intro {
    font-family: 'DM Sans', sans-serif;
    font-size: 0.95rem;
    font-weight: 300;
    color: var(--text-meta);
    line-height: 1.7;
}

/* ==========================================================================
   Scroll Reveal
   ========================================================================== */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.visible {
    opacity: 1;
    transform: none;
}

/* ==========================================================================
   Noise Overlay (for dark sections)
   ========================================================================== */
.noise-overlay {
    position: relative;
}

.noise-overlay::after {
    content: '';
    position: absolute;
    inset: 0;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    pointer-events: none;
}

/* ==========================================================================
   Navigation
   ========================================================================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: background 0.3s, backdrop-filter 0.3s;
}

.nav.scrolled {
    background: rgba(245, 240, 232, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

@media (prefers-color-scheme: dark) {
    .nav.scrolled {
        background: rgba(26, 24, 21, 0.85);
    }
}

[data-theme="dark"] .nav.scrolled {
    background: rgba(26, 24, 21, 0.85);
}

[data-theme="light"] .nav.scrolled {
    background: rgba(245, 240, 232, 0.85);
}

/* Nav over dark hero — light text until scrolled */
.nav--over-hero .nav-logo,
.nav--over-hero .nav-wordmark {
    color: #F5F0E8;
}

.nav--over-hero .nav-links a {
    color: #A89A7B;
}

.nav--over-hero .nav-links a:hover,
.nav--over-hero .nav-links a.active {
    color: #F5F0E8;
}

.nav--over-hero .theme-toggle {
    color: #A89A7B;
}

.nav--over-hero .theme-toggle:hover {
    color: #F5F0E8;
}

.nav--over-hero .nav-hamburger span {
    background: #F5F0E8;
}

/* Once scrolled, revert to theme-aware colors */
.nav--over-hero.scrolled .nav-logo,
.nav--over-hero.scrolled .nav-wordmark {
    color: var(--logo-text);
}

.nav--over-hero.scrolled .nav-links a {
    color: var(--text-secondary);
}

.nav--over-hero.scrolled .nav-links a:hover,
.nav--over-hero.scrolled .nav-links a.active {
    color: var(--accent);
}

.nav--over-hero.scrolled .theme-toggle {
    color: var(--text-secondary);
}

.nav--over-hero.scrolled .theme-toggle:hover {
    color: var(--accent);
}

.nav--over-hero.scrolled .nav-hamburger span {
    background: var(--text-primary);
}

.nav-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 1.25rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* --- Nav Logo --- */
.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
    color: var(--logo-text);
}

.nav-logo svg {
    width: 28px;
    height: 28px;
}

.nav-wordmark {
    font-family: 'Instrument Serif', serif;
    font-size: 1.1rem;
    font-weight: 400;
    color: var(--logo-text);
}

.nav-wordmark span {
    color: var(--accent);
}

/* --- Nav Links --- */
.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    text-decoration: none;
    color: var(--text-secondary);
    transition: color 0.25s;
}

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

.nav-links a.active {
    color: var(--accent);
}

/* --- Theme Toggle --- */
.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: color 0.25s;
    border-radius: 4px;
}

.theme-toggle:hover {
    color: var(--accent);
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
}

/* Sun icon hidden in dark mode, moon icon hidden in light mode */
.theme-toggle .icon-sun {
    display: block;
}

.theme-toggle .icon-moon {
    display: none;
}

@media (prefers-color-scheme: dark) {
    .theme-toggle .icon-sun {
        display: none;
    }
    .theme-toggle .icon-moon {
        display: block;
    }
}

[data-theme="dark"] .theme-toggle .icon-sun {
    display: none;
}

[data-theme="dark"] .theme-toggle .icon-moon {
    display: block;
}

[data-theme="light"] .theme-toggle .icon-sun {
    display: block;
}

[data-theme="light"] .theme-toggle .icon-moon {
    display: none;
}

/* --- Hamburger --- */
.nav-hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-hamburger span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 1px;
    transition: transform 0.3s, opacity 0.3s;
}

.nav-hamburger.open span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.nav-hamburger.open span:nth-child(2) {
    opacity: 0;
}

.nav-hamburger.open span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

/* --- Mobile Nav --- */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 5;
        background: var(--bg-primary);
        flex-direction: column;
        align-items: center;
        gap: 0;
        padding: 5rem 2rem 2rem;
        transform: translateY(-100%);
        transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
        border-bottom: 1px solid var(--border);
    }

    .nav-links.open {
        transform: translateY(0);
    }

    .nav-links a {
        font-size: 0.8rem;
        padding: 1rem 0;
        width: 100%;
        text-align: center;
        border-bottom: 1px solid var(--border);
    }

    .nav-links a:last-of-type {
        border-bottom: none;
    }

    .theme-toggle {
        margin-top: 1rem;
    }

    .nav-hamburger {
        display: flex;
        z-index: 10;
    }
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
    background: var(--bg-dark);
    color: #F5F0E8;
    padding: 4rem 2rem 2rem;
    position: relative;
}

.footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    text-align: center;
}

.footer-logo {
    font-family: 'Instrument Serif', serif;
    font-size: 1.4rem;
    font-weight: 400;
    color: #F5F0E8;
    margin-bottom: 0.5rem;
}

.footer-logo span {
    color: var(--accent);
}

.footer-tagline {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: #8B7D5E;
    margin-bottom: 2rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2.5rem;
}

.footer-links a {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    text-decoration: none;
    color: #A89A7B;
    transition: color 0.25s;
}

.footer-links a:hover {
    color: #F5F0E8;
}

.footer-copyright {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6rem;
    letter-spacing: 0.1em;
    color: rgba(245, 240, 232, 0.3);
    padding-top: 2rem;
    border-top: 1px solid rgba(245, 240, 232, 0.08);
}

/* ==========================================================================
   Responsive Basics
   ========================================================================== */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
}

@media (max-width: 768px) {
    .nav-inner {
        padding: 1rem 1.25rem;
    }

    .footer {
        padding: 3rem 1.25rem 1.5rem;
    }

    .footer-links {
        flex-direction: column;
        gap: 1rem;
    }
}