/* ============================================
   continua.club — Bauhaus Coastal Retreat
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    --canvas: #faf6ee;
    --surface: #e8dfd0;
    --coastal-air: #d4e4ea;
    --primary-text: #2b3a42;
    --body-text: #4a5a62;
    --muted: #8a9da8;
    --accent-warm: #c47a4e;
    --accent-cool: #3d8a8a;
    --rule-lines: #a3b8c2;
    --neutral-mid: #f0ede6;
    --cool-end: #e6ecf0;
    --scroll-temp: 0;
    --nav-height: 56px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Libre Franklin', sans-serif;
    font-weight: 300;
    color: var(--body-text);
    background-color: var(--canvas);
    line-height: 1.72;
    overflow-x: hidden;
    transition: background-color 0.8s ease;
}

/* --- Paper Grain Texture Overlay --- */
.paper-grain {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.025;
    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)'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 256px 256px;
}

/* --- Navigation --- */
.nav-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 clamp(1.5rem, 4vw, 3rem);
    background: rgba(250, 246, 238, 0.92);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 1000;
}

.nav-wordmark {
    font-family: 'Bebas Neue', sans-serif;
    font-size: 1.2rem;
    letter-spacing: 0.06em;
    color: var(--primary-text);
    text-transform: uppercase;
}

.nav-hamburger {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    position: relative;
    z-index: 1001;
}

.hamburger-line {
    display: block;
    height: 2px;
    background-color: var(--primary-text);
    transition: all 0.3s ease;
}

.hamburger-line--1 { width: 28px; }
.hamburger-line--2 { width: 22px; }
.hamburger-line--3 { width: 16px; }

.nav-hamburger.active .hamburger-line--1 {
    transform: translateY(7px) rotate(45deg);
    width: 28px;
}
.nav-hamburger.active .hamburger-line--2 {
    opacity: 0;
    width: 0;
}
.nav-hamburger.active .hamburger-line--3 {
    transform: translateY(-7px) rotate(-45deg);
    width: 28px;
}

.nav-hamburger.active .hamburger-line {
    background-color: var(--canvas);
}

/* --- Navigation Panel --- */
.nav-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    height: 100vh;
    height: 100dvh;
    background: var(--primary-text);
    z-index: 999;
    transform: translateX(100%);
    transition: transform 400ms cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-panel.open {
    transform: translateX(0);
}

.nav-panel-accent {
    position: absolute;
    left: 32px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--accent-warm);
}

.nav-panel-links {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-family: 'Bebas Neue', sans-serif;
    font-size: 2rem;
    letter-spacing: 0.06em;
    color: var(--canvas);
    text-decoration: none;
    text-transform: uppercase;
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 300ms ease, transform 300ms ease, color 200ms ease;
}

.nav-panel.open .nav-link {
    opacity: 1;
    transform: translateX(0);
}

.nav-panel.open .nav-link:nth-child(1) { transition-delay: 100ms; }
.nav-panel.open .nav-link:nth-child(2) { transition-delay: 160ms; }
.nav-panel.open .nav-link:nth-child(3) { transition-delay: 220ms; }
.nav-panel.open .nav-link:nth-child(4) { transition-delay: 280ms; }
.nav-panel.open .nav-link:nth-child(5) { transition-delay: 340ms; }
.nav-panel.open .nav-link:nth-child(6) { transition-delay: 400ms; }

.nav-link:hover {
    color: var(--accent-warm);
}

.nav-link-shape {
    flex-shrink: 0;
    transition: transform 300ms ease;
}

.nav-link:hover .nav-link-shape {
    transform: rotate(15deg) scale(1.2);
}

/* --- Hero Section --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(180deg, var(--canvas) 0%, var(--coastal-air) 100%);
    overflow: hidden;
    padding-top: var(--nav-height);
}

.hero-bg-shapes {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.hero-shape {
    position: absolute;
    opacity: 0;
    animation: heroShapeFadeIn 1.5s ease forwards;
}

.hero-shape--circle {
    top: 8%;
    right: 10%;
    opacity: 0;
    animation: heroShapeFadeIn 1.5s ease 0.5s forwards, driftCircle 30s infinite linear;
}

.hero-shape--triangle {
    bottom: 12%;
    left: 8%;
    transform: rotate(30deg);
    opacity: 0;
    animation: heroShapeFadeIn 1.5s ease 0.7s forwards, driftTriangle 30s infinite linear;
}

.hero-shape--square {
    top: 40%;
    left: 25%;
    transform: rotate(12deg);
    opacity: 0;
    animation: heroShapeFadeIn 1.5s ease 0.9s forwards, driftSquare 30s infinite linear;
}

@keyframes heroShapeFadeIn {
    to { opacity: 0.06; }
}

@keyframes driftCircle {
    0%, 100% { transform: translate(0, 0); }
    25% { transform: translate(10px, -15px); }
    50% { transform: translate(-8px, -20px); }
    75% { transform: translate(15px, -5px); }
}

@keyframes driftTriangle {
    0%, 100% { transform: rotate(30deg) translate(0, 0); }
    25% { transform: rotate(30deg) translate(-12px, 8px); }
    50% { transform: rotate(30deg) translate(10px, 15px); }
    75% { transform: rotate(30deg) translate(-5px, -10px); }
}

@keyframes driftSquare {
    0%, 100% { transform: rotate(12deg) translate(0, 0); }
    25% { transform: rotate(12deg) translate(8px, 12px); }
    50% { transform: rotate(12deg) translate(-15px, 5px); }
    75% { transform: rotate(12deg) translate(10px, -8px); }
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
}

.hero-title {
    font-family: 'Bebas Neue', sans-serif;
    font-size: clamp(5rem, 14vw, 12rem);
    font-weight: 400;
    color: var(--primary-text);
    letter-spacing: 0.06em;
    line-height: 1;
    display: inline-flex;
}

.hero-letter {
    display: inline-block;
    opacity: 0;
    transform: translateY(20px);
    animation: letterSlideUp 0.5s ease forwards;
}

@keyframes letterSlideUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-subtitle {
    display: block;
    text-align: right;
    font-family: 'DM Mono', monospace;
    font-size: 0.7rem;
    letter-spacing: 0.04em;
    color: var(--muted);
    opacity: 0;
    animation: subtitleFadeIn 0.6s ease 1.2s forwards;
    padding-right: 0.1em;
}

@keyframes subtitleFadeIn {
    to { opacity: 1; }
}

.hero-scroll-cue {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
    animation: scrollCueBounce 2.5s ease-in-out infinite 2s;
    opacity: 0.6;
}

@keyframes scrollCueBounce {
    0%, 100% { transform: translateX(-50%) translateY(0) rotate(180deg); }
    50% { transform: translateX(-50%) translateY(8px) rotate(180deg); }
}

/* --- Section Dividers --- */
.section-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    padding: 1rem 0;
    width: 85vw;
    max-width: 1200px;
    margin: 0 auto;
}

.divider-line {
    flex: 1;
    border: none;
    height: 1px;
    background: var(--rule-lines);
}

.divider-marker {
    flex-shrink: 0;
}

/* --- Stacked Sections (General) --- */
.stacked-section {
    width: 85vw;
    max-width: 1200px;
    margin: 0 auto;
    padding-block: clamp(4rem, 8vh, 8rem);
}

.section-heading {
    font-family: 'Bebas Neue', sans-serif;
    font-size: clamp(3.5rem, 9vw, 8rem);
    font-weight: 400;
    color: var(--primary-text);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    line-height: 1.05;
    margin-bottom: 1.5rem;
}

.section-body {
    font-family: 'Libre Franklin', sans-serif;
    font-weight: 300;
    font-size: clamp(1rem, 1.8vw, 1.2rem);
    line-height: 1.72;
    color: var(--body-text);
    max-width: 62ch;
    margin-bottom: 1rem;
}

.section-caption {
    font-family: 'DM Mono', monospace;
    font-size: 0.8rem;
    letter-spacing: 0.04em;
    color: var(--muted);
    display: block;
    margin-top: 1.5rem;
}

.section-geo {
    display: block;
    margin-bottom: 1.5rem;
}

.section-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: 'Libre Franklin', sans-serif;
    font-weight: 500;
    font-size: clamp(1rem, 1.8vw, 1.2rem);
    color: var(--accent-warm);
    text-decoration: none;
    margin-top: 1.5rem;
    transition: gap 300ms ease;
}

.section-link:hover {
    gap: 0.8rem;
}

.link-triangle {
    transition: transform 300ms ease;
}

.section-link:hover .link-triangle {
    transform: translateX(3px);
}

/* --- Stagger Animation (applied via JS) --- */
.stagger-group > * {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.stagger-group.visible > *:nth-child(1) {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 0ms;
}

.stagger-group.visible > *:nth-child(2) {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 80ms;
}

.stagger-group.visible > *:nth-child(3) {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 160ms;
}

.stagger-group.visible > *:nth-child(4) {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 240ms;
}

.stagger-group.visible > *:nth-child(5) {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 320ms;
}

.stagger-group.visible > *:nth-child(6) {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 400ms;
}

/* --- Albers Grid Layout --- */
.section-albers {
    display: flex;
    justify-content: center;
}

.albers-frame {
    padding: 24px;
}

.albers-frame--outer {
    background: var(--surface);
}

.albers-frame--outer.albers-frame--alt {
    background: var(--coastal-air);
}

.albers-frame--middle {
    background: var(--coastal-air);
}

.albers-frame--middle.albers-frame--alt {
    background: var(--surface);
}

.albers-frame--inner {
    background: var(--canvas);
    padding: clamp(2rem, 4vw, 3rem);
}

/* --- Kandinsky Diagonal Layout --- */
.kandinsky-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: clamp(2rem, 4vw, 3rem);
    align-items: center;
}

.kandinsky-shape {
    display: flex;
    align-items: center;
    justify-content: center;
}

.kandinsky-svg {
    transform: rotate(15deg);
    transition: transform 600ms ease;
    margin: 0;
}

.kandinsky-text {
    display: flex;
    flex-direction: column;
}

/* --- Moholy Balance Layout --- */
.moholy-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

.moholy-title {
    font-size: clamp(4rem, 10vw, 9rem);
}

.moholy-geo-cluster {
    display: grid;
    grid-template-columns: 1fr 2fr 1fr;
    grid-template-rows: 1fr 2fr 1fr;
    gap: 1rem;
    max-width: 400px;
    height: 200px;
}

.moholy-shape--1 {
    grid-column: 1;
    grid-row: 1;
    justify-self: start;
    align-self: start;
}

.moholy-shape--2 {
    grid-column: 2;
    grid-row: 2;
    justify-self: end;
    align-self: center;
}

.moholy-shape--3 {
    grid-column: 3;
    grid-row: 1;
    justify-self: end;
    align-self: end;
}

.moholy-shape--4 {
    grid-column: 1;
    grid-row: 3;
    justify-self: center;
    align-self: end;
}

.moholy-text {
    max-width: 62ch;
}

/* --- Composition Panel --- */
.composition-panel {
    width: 85vw;
    max-width: 1200px;
    margin: 0 auto;
    padding-block: clamp(4rem, 8vh, 8rem);
}

.composition-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.composition-title {
    text-align: center;
}

.composition-canvas {
    position: relative;
    width: 100%;
    max-width: 700px;
    height: 400px;
    margin: 2rem auto;
}

.comp-shape {
    position: absolute;
    transition: transform 600ms ease;
    cursor: default;
}

.comp-shape--large-circle {
    top: 10%;
    left: 5%;
}

.comp-shape--tri-1 {
    top: 15%;
    right: 15%;
    transform: rotate(-10deg);
}

.comp-shape--tri-2 {
    top: 55%;
    right: 25%;
    transform: rotate(20deg);
}

.comp-shape--tri-3 {
    bottom: 10%;
    left: 40%;
    transform: rotate(-25deg);
}

.comp-shape--med-square {
    bottom: 5%;
    right: 10%;
    transform: rotate(8deg);
}

.comp-shape--small-circle {
    top: 60%;
    left: 15%;
}

.composition-text {
    max-width: 62ch;
    text-align: center;
}

/* --- Footer --- */
.site-footer {
    padding: clamp(3rem, 6vh, 5rem) clamp(1.5rem, 4vw, 3rem);
    text-align: center;
    border-top: 1px solid var(--rule-lines);
}

.footer-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-text {
    font-family: 'Bebas Neue', sans-serif;
    font-size: 1.4rem;
    letter-spacing: 0.06em;
    color: var(--primary-text);
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.footer-caption {
    font-family: 'DM Mono', monospace;
    font-size: 0.8rem;
    letter-spacing: 0.04em;
    color: var(--muted);
}

/* --- Background Triangle Textures --- */
.stacked-section {
    position: relative;
}

.stacked-section::before {
    content: '';
    position: absolute;
    top: -50px;
    right: -30px;
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, var(--accent-warm) 0%, transparent 50%);
    clip-path: polygon(50% 0%, 100% 100%, 0% 100%);
    opacity: 0.04;
    transform: rotate(25deg);
    pointer-events: none;
    z-index: 0;
}

.stacked-section:nth-child(odd)::before {
    left: -30px;
    right: auto;
    transform: rotate(-15deg);
}

.section-content,
.kandinsky-grid,
.moholy-layout,
.composition-wrapper {
    position: relative;
    z-index: 1;
}

/* --- Responsive: Mobile --- */
@media (max-width: 768px) {
    .stacked-section {
        width: 100%;
        padding-inline: 1.5rem;
    }

    .section-divider {
        width: 100%;
        padding-inline: 1.5rem;
    }

    .composition-panel {
        width: 100%;
        padding-inline: 1.5rem;
    }

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

    .kandinsky-shape {
        order: -1;
    }

    .kandinsky-svg {
        width: 80px;
        height: 80px;
        transform: rotate(15deg);
    }

    .hero-bg-shapes {
        display: none;
    }

    .albers-frame {
        padding: 12px;
    }

    .albers-frame--inner {
        padding: 1.5rem;
    }

    .moholy-title {
        font-size: clamp(3rem, 10vw, 5rem);
    }

    .composition-canvas {
        height: 300px;
    }

    .comp-shape--large-circle {
        width: 120px;
        height: 120px;
    }

    .nav-panel-accent {
        left: 16px;
    }

    .section-heading {
        font-size: clamp(2.5rem, 8vw, 5rem);
    }
}

/* --- Hover triangle indicator for interactive elements --- */
.section-link::before {
    content: '';
    display: none;
}

/* Smooth scrolling for anchor links */
html {
    scroll-padding-top: var(--nav-height);
}