/* ================================================
   diplomatic.day — Styles
   Palette: Creamy Pastel with Oceanic Accents
   Typography: Space Grotesk / DM Sans / IBM Plex Mono
   ================================================ */

/* --- CSS Custom Properties --- */
:root {
    --bg-primary: #F5F0E8;        /* Diplomatic Cream */
    --bg-secondary: #EDE4D8;      /* Parchment Blush */
    --text-primary: #4A3F35;      /* Espresso Ink */
    --text-secondary: #B8977E;    /* Warm Caramel */
    --accent-primary: #5B9EA6;    /* Adriatic Teal */
    --accent-secondary: #A8D5BA;  /* Shore Foam */
    --highlight: #E8B89D;         /* Sunset Apricot */
    --highlight-bright: #F0C4A8;  /* Bright Apricot */
    --deep-anchor: #2C3E50;       /* Midnight Diplomat */

    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'DM Sans', sans-serif;
    --font-mono: 'IBM Plex Mono', monospace;

    --ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(1rem, 1.2vw + 0.4rem, 1.25rem);
    line-height: 1.72;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Linen weave texture overlay */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    background:
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 3px,
            rgba(74, 63, 53, 0.015) 3px,
            rgba(74, 63, 53, 0.015) 4px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 3px,
            rgba(74, 63, 53, 0.015) 3px,
            rgba(74, 63, 53, 0.015) 4px
        );
}

/* --- Progress Bar --- */
#progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 6px;
    z-index: 10000;
    background: rgba(245, 240, 232, 0.8);
    backdrop-filter: blur(4px);
}

#progress-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

/* --- Opening Overture --- */
.section-overture {
    position: relative;
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-primary);
    overflow: hidden;
}

.overture-content {
    text-align: center;
    z-index: 2;
    transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

.overture-label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.overture-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(3rem, 8vw + 0.5rem, 7rem);
    letter-spacing: 0.02em;
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.1;
}

.overture-subtitle {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(1rem, 1.5vw + 0.3rem, 1.35rem);
    color: var(--text-secondary);
    max-width: 420px;
    margin: 0 auto;
    line-height: 1.6;
}

.overture-scroll-hint {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 4;
    opacity: 0.6;
    animation: scrollHintPulse 2s ease-in-out infinite;
}

@keyframes scrollHintPulse {
    0%, 100% { opacity: 0.6; transform: translateX(-50%) translateY(0); }
    50% { opacity: 0.3; transform: translateX(-50%) translateY(6px); }
}

.scroll-dot {
    animation: scrollDotBounce 2s ease-in-out infinite;
}

@keyframes scrollDotBounce {
    0%, 100% { cy: 12; }
    50% { cy: 26; }
}

.overture-divider-hint {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 300px;
    z-index: 3;
}

#divider-emergence {
    width: 100%;
    height: 100%;
}

/* --- Bilateral Canvas (Split-Screen Grid) --- */
.bilateral-canvas {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 40px 1fr;
    min-height: 100vh;
    background-color: var(--bg-primary);
    transition: grid-template-columns 0.6s var(--ease-smooth);
}

.bilateral-canvas.converging {
    grid-template-columns: 1fr 0px 0fr;
}

/* Panel Columns */
.panel-column {
    position: relative;
}

.panel-column-left {
    grid-column: 1;
    background-color: var(--bg-primary);
}

.panel-column-right {
    grid-column: 3;
    background-color: var(--bg-secondary);
}

/* Wave-Form Divider */
.wave-divider-col {
    grid-column: 2;
    position: relative;
    width: 40px;
    z-index: 10;
    transition: opacity 0.6s var(--ease-smooth);
}

.bilateral-canvas.converging .wave-divider-col {
    opacity: 0;
}

.wave-svg-sticky {
    position: sticky;
    top: 0;
    width: 40px;
    height: 100vh;
}

/* --- Dialogue Panels --- */
.dialogue-panel {
    padding: 6rem 4rem;
}

.dialogue-panel.panel-left {
    position: relative;
    z-index: 1;
}

.dialogue-panel.panel-right {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

/* Wave Interference Background Texture for left panels */
.dialogue-panel.panel-left::after {
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background:
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 20px,
            rgba(91, 158, 166, 0.02) 20px,
            rgba(91, 158, 166, 0.02) 21px
        ),
        repeating-linear-gradient(
            60deg,
            transparent,
            transparent 25px,
            rgba(168, 213, 186, 0.015) 25px,
            rgba(168, 213, 186, 0.015) 26px
        );
    opacity: 0.6;
}

.dialogue-panel.panel-left > * {
    position: relative;
    z-index: 2;
}

/* --- Section Typography --- */
.section-label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.section-headline {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2.5rem, 6vw + 0.5rem, 5.5rem);
    letter-spacing: 0.02em;
    color: var(--text-primary);
    margin-bottom: 2rem;
    line-height: 1.15;
}

.section-body {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(1rem, 1.2vw + 0.4rem, 1.25rem);
    line-height: 1.72;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    max-width: 540px;
}

.section-body:last-child {
    margin-bottom: 0;
}

/* Emphasized passages */
.section-body em {
    font-weight: 500;
    font-style: normal;
    color: var(--accent-primary);
}

/* --- Circular Ripple Marks Behind Key Statements --- */
.dialogue-panel.panel-left .section-body:first-of-type {
    position: relative;
}

.dialogue-panel.panel-left .section-body:first-of-type::before {
    content: '';
    position: absolute;
    top: 50%;
    left: -2rem;
    width: 200%;
    height: 200%;
    transform: translate(-20%, -50%);
    background:
        radial-gradient(circle at 50% 50%, transparent 20%, rgba(168, 213, 186, 0.04) 21%, transparent 22%),
        radial-gradient(circle at 50% 50%, transparent 30%, rgba(168, 213, 186, 0.035) 31%, transparent 32%),
        radial-gradient(circle at 50% 50%, transparent 40%, rgba(168, 213, 186, 0.03) 41%, transparent 42%),
        radial-gradient(circle at 50% 50%, transparent 50%, rgba(168, 213, 186, 0.025) 51%, transparent 52%),
        radial-gradient(circle at 50% 50%, transparent 60%, rgba(168, 213, 186, 0.02) 61%, transparent 62%);
    pointer-events: none;
    z-index: -1;
}

/* --- Nature Images (CSS-Generated) --- */
.nature-image {
    position: relative;
    width: 100%;
    max-width: 460px;
    aspect-ratio: 4 / 3;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.image-overlay {
    position: absolute;
    inset: 0;
    mix-blend-mode: multiply;
    z-index: 2;
}

.wave-texture {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 3;
    pointer-events: none;
}

.image-caption {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

/* Estuary Image: Tidal blending */
.estuary-image {
    background: linear-gradient(
        135deg,
        var(--bg-primary) 0%,
        var(--highlight) 25%,
        var(--accent-primary) 50%,
        var(--accent-secondary) 75%,
        var(--bg-secondary) 100%
    );
}

.estuary-image .image-overlay {
    background: radial-gradient(
        ellipse at 40% 60%,
        rgba(91, 158, 166, 0.3) 0%,
        rgba(168, 213, 186, 0.2) 40%,
        transparent 70%
    );
}

.ripple-pattern {
    position: absolute;
    inset: 0;
    z-index: 1;
    background:
        radial-gradient(circle at 35% 45%, transparent 20%, rgba(91, 158, 166, 0.08) 21%, transparent 22%),
        radial-gradient(circle at 35% 45%, transparent 30%, rgba(91, 158, 166, 0.06) 31%, transparent 32%),
        radial-gradient(circle at 35% 45%, transparent 40%, rgba(91, 158, 166, 0.04) 41%, transparent 42%),
        radial-gradient(circle at 35% 45%, transparent 50%, rgba(91, 158, 166, 0.03) 51%, transparent 52%),
        radial-gradient(circle at 65% 55%, transparent 15%, rgba(232, 184, 157, 0.08) 16%, transparent 17%),
        radial-gradient(circle at 65% 55%, transparent 25%, rgba(232, 184, 157, 0.06) 26%, transparent 27%),
        radial-gradient(circle at 65% 55%, transparent 35%, rgba(232, 184, 157, 0.04) 36%, transparent 37%);
}

/* Canopy Image: Crown shyness */
.canopy-image {
    background: linear-gradient(
        160deg,
        var(--accent-secondary) 0%,
        #8BC4A0 20%,
        var(--bg-primary) 50%,
        #8BC4A0 80%,
        var(--accent-secondary) 100%
    );
}

.canopy-image .image-overlay {
    background: linear-gradient(
        180deg,
        rgba(168, 213, 186, 0.4) 0%,
        rgba(245, 240, 232, 0.6) 50%,
        rgba(168, 213, 186, 0.4) 100%
    );
}

.crown-shyness-pattern {
    position: absolute;
    inset: 0;
    z-index: 1;
    background:
        radial-gradient(ellipse at 20% 20%, var(--accent-secondary) 0%, transparent 35%),
        radial-gradient(ellipse at 80% 15%, var(--accent-secondary) 0%, transparent 30%),
        radial-gradient(ellipse at 15% 75%, var(--accent-secondary) 0%, transparent 32%),
        radial-gradient(ellipse at 85% 80%, var(--accent-secondary) 0%, transparent 28%),
        radial-gradient(ellipse at 50% 50%, var(--bg-primary) 0%, transparent 25%);
    opacity: 0.7;
}

.canopy-branches {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 3;
    pointer-events: none;
}

/* Wave Pattern Image: Interference */
.wave-pattern-image {
    background: linear-gradient(
        45deg,
        var(--bg-secondary) 0%,
        var(--accent-primary) 100%
    );
}

.wave-pattern-image .image-overlay {
    background: radial-gradient(
        circle at 50% 50%,
        rgba(91, 158, 166, 0.2) 0%,
        transparent 60%
    );
}

.interference-pattern {
    position: absolute;
    inset: 0;
    z-index: 1;
    background:
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 8px,
            rgba(91, 158, 166, 0.12) 8px,
            rgba(91, 158, 166, 0.12) 9px
        ),
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 12px,
            rgba(168, 213, 186, 0.08) 12px,
            rgba(168, 213, 186, 0.08) 13px
        ),
        repeating-linear-gradient(
            -30deg,
            transparent,
            transparent 10px,
            rgba(232, 184, 157, 0.06) 10px,
            rgba(232, 184, 157, 0.06) 11px
        );
}

/* Sand Ripple Image */
.sand-ripple-image {
    background: linear-gradient(
        180deg,
        var(--bg-primary) 0%,
        var(--bg-secondary) 40%,
        var(--highlight) 80%,
        var(--bg-primary) 100%
    );
}

.sand-ripple-image .image-overlay {
    background: radial-gradient(
        ellipse at 50% 30%,
        rgba(245, 240, 232, 0.3) 0%,
        transparent 50%
    );
}

.sand-pattern {
    position: absolute;
    inset: 0;
    z-index: 1;
    background:
        repeating-linear-gradient(
            175deg,
            transparent,
            transparent 4px,
            rgba(184, 151, 126, 0.15) 4px,
            rgba(184, 151, 126, 0.15) 5px,
            transparent 5px,
            transparent 9px
        ),
        repeating-linear-gradient(
            178deg,
            transparent,
            transparent 6px,
            rgba(184, 151, 126, 0.08) 6px,
            rgba(184, 151, 126, 0.08) 7px,
            transparent 7px,
            transparent 13px
        );
}

/* Constellation Image */
.constellation-image {
    background: linear-gradient(
        135deg,
        var(--deep-anchor) 0%,
        #3A5068 40%,
        #2C3E50 70%,
        #1A2A3A 100%
    );
}

.constellation-image .image-overlay {
    background: radial-gradient(
        circle at 50% 50%,
        rgba(91, 158, 166, 0.08) 0%,
        transparent 60%
    );
}

.constellation-pattern {
    position: absolute;
    inset: 0;
    z-index: 1;
    background:
        radial-gradient(circle at 17% 17%, rgba(245, 240, 232, 0.12) 0%, transparent 1.5%),
        radial-gradient(circle at 39% 35%, rgba(245, 240, 232, 0.08) 0%, transparent 1%),
        radial-gradient(circle at 70% 23%, rgba(245, 240, 232, 0.1) 0%, transparent 1.2%),
        radial-gradient(circle at 83% 58%, rgba(245, 240, 232, 0.07) 0%, transparent 0.8%),
        radial-gradient(circle at 30% 75%, rgba(245, 240, 232, 0.09) 0%, transparent 1%),
        radial-gradient(circle at 57% 52%, rgba(245, 240, 232, 0.14) 0%, transparent 1.5%),
        radial-gradient(circle at 87% 87%, rgba(245, 240, 232, 0.08) 0%, transparent 1%);
}

.constellation-svg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 3;
    pointer-events: none;
}

/* --- Convergence Sections --- */
.convergence-section {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 80vh;
    padding: 8rem 4rem;
    background: var(--bg-primary);
    overflow: hidden;
}

.convergence-radial-bg {
    position: absolute;
    inset: 0;
    background: radial-gradient(
        circle at 50% 50%,
        var(--highlight) 0%,
        var(--bg-secondary) 25%,
        var(--bg-primary) 60%
    );
    opacity: 0;
    transition: opacity 1.2s var(--ease-smooth);
}

.convergence-section.in-view .convergence-radial-bg {
    opacity: 1;
}

.convergence-wave-top,
.convergence-wave-bottom {
    width: 100%;
    height: 10px;
    position: absolute;
    z-index: 2;
}

.convergence-wave-top {
    top: 0;
}

.convergence-wave-bottom {
    bottom: 0;
}

.convergence-wave-top svg,
.convergence-wave-bottom svg {
    width: 100%;
    height: 100%;
}

.convergence-content {
    text-align: center;
    max-width: 800px;
    position: relative;
    z-index: 3;
}

.convergence-statement {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2rem, 4vw + 0.5rem, 3.5rem);
    letter-spacing: 0.02em;
    color: var(--text-primary);
    line-height: 1.3;
    margin-top: 1.5rem;
}

/* --- Closing Accord --- */
#closing-accord {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 8rem 4rem;
    background: linear-gradient(
        180deg,
        var(--bg-primary) 0%,
        var(--bg-secondary) 100%
    );
}

.closing-content {
    text-align: center;
    max-width: 700px;
}

.closing-statement {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2rem, 4vw + 0.5rem, 3.5rem);
    letter-spacing: 0.02em;
    color: var(--text-primary);
    line-height: 1.3;
    margin-top: 1.5rem;
    margin-bottom: 4rem;
}

.closing-signature {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.signature-domain {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--accent-primary);
    letter-spacing: 0.02em;
}

.signature-note {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

/* --- Footer --- */
#site-footer {
    background-color: var(--deep-anchor);
    padding: 3rem 4rem;
    text-align: center;
    position: relative;
}

.footer-wave {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 30px;
    transform: translateY(-50%);
}

.footer-wave svg {
    width: 100%;
    height: 100%;
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.footer-text {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: rgba(245, 240, 232, 0.6);
}

.footer-divider {
    color: rgba(245, 240, 232, 0.3);
    font-size: 1rem;
}

/* --- Fade-Reveal Animation --- */
.fade-reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

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

/* --- Link Hover Wave Underline --- */
a {
    color: var(--accent-primary);
    text-decoration: none;
    position: relative;
    display: inline-block;
}

a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 3px;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 6'%3E%3Cpath d='M0 3 Q 12.5 0, 25 3 Q 37.5 6, 50 3 Q 62.5 0, 75 3 Q 87.5 6, 100 3' fill='none' stroke='%235B9EA6' stroke-width='1.5'/%3E%3C/svg%3E") repeat-x;
    background-size: 50px 6px;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s var(--ease-out);
}

a:hover::after {
    transform: scaleX(1);
}

/* --- Scrollbar Styling --- */
.panel-column::-webkit-scrollbar {
    width: 4px;
}

.panel-column::-webkit-scrollbar-track {
    background: transparent;
}

.panel-column::-webkit-scrollbar-thumb {
    background: var(--bg-secondary);
    border-radius: 2px;
}

.panel-column::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* --- Right panel parallax offset container --- */
.panel-column-right .dialogue-panel {
    transition: transform 0.1s linear;
}

/* --- Responsive: Mobile (< 768px) --- */
@media (max-width: 768px) {
    .bilateral-canvas {
        display: flex;
        flex-direction: column;
    }

    .wave-divider-col {
        width: 100%;
        height: 40px;
        order: 0;
    }

    .wave-svg-sticky {
        width: 100%;
        height: 40px;
        position: relative;
    }

    .panel-column-left {
        order: 1;
    }

    .panel-column-right {
        order: 2;
    }

    .dialogue-panel {
        padding: 4rem 2rem;
    }

    .convergence-section {
        padding: 6rem 2rem;
    }

    #closing-accord {
        padding: 6rem 2rem;
    }

    .section-headline {
        font-size: clamp(2rem, 5vw + 0.5rem, 3.5rem);
    }

    .convergence-statement,
    .closing-statement {
        font-size: clamp(1.5rem, 3vw + 0.5rem, 2.5rem);
    }

    #site-footer {
        padding: 2rem;
    }

    .footer-content {
        flex-direction: column;
        gap: 0.5rem;
    }

    .footer-divider {
        display: none;
    }

    .overture-scroll-hint {
        bottom: 2rem;
    }
}

/* --- Small mobile (< 480px) --- */
@media (max-width: 480px) {
    .dialogue-panel {
        padding: 3rem 1.5rem;
    }

    .convergence-section {
        padding: 4rem 1.5rem;
    }

    #closing-accord {
        padding: 4rem 1.5rem;
    }

    .nature-image {
        max-width: 100%;
    }
}

/* --- Reduced motion --- */
@media (prefers-reduced-motion: reduce) {
    .fade-reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }

    .convergence-radial-bg {
        transition: none;
    }

    .overture-scroll-hint {
        animation: none;
    }

    .scroll-dot {
        animation: none;
    }
}