/* ============================================
   plotgrapher.com - Translucent Frost / Aqueous Minimalism
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    --glacial-white: #e8eff6;
    --frost-glass: #f0f4f8;
    --deep-ink: #1a2a3a;
    --slate-mist: #607888;
    --ember-glow: #e8734a;
    --still-water: #4a9ec8;
    --sunrise-peach: #f5c4a1;
    --ice-edge: #c8d8e8;
    --abyss-navy: #0d1b2a;
    --bg-depth: #e8eff6;
    --bg-depth-deep: #dbe5f0;
    --caustic-opacity: 0.04;
}

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

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

body {
    font-family: 'Inter', sans-serif;
    font-weight: 400;
    font-size: clamp(1rem, 1.8vw, 1.15rem);
    line-height: 1.75;
    color: var(--deep-ink);
    background-color: var(--bg-depth);
    overflow-x: hidden;
    position: relative;
    min-height: 100vh;
}

/* --- Caustic Light Background Layer --- */
#caustic-layer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 0;
    pointer-events: none;
    opacity: var(--caustic-opacity);
    will-change: opacity;
}

#caustic-layer svg {
    width: 100%;
    height: 100%;
}

/* --- Bubble Particle Field --- */
#bubble-field {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1;
    pointer-events: none;
    overflow: hidden;
}

.bubble {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
    will-change: transform, opacity;
}

/* --- Click Particle Container --- */
#click-particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 5;
    pointer-events: none;
    overflow: hidden;
}

.click-particle {
    position: absolute;
    width: 3px;
    height: 3px;
    border-radius: 50%;
    pointer-events: none;
    will-change: transform, opacity;
    transition: transform 1.5s cubic-bezier(0.25, 0.1, 0.25, 1),
                opacity 1.5s cubic-bezier(0.25, 0.1, 0.25, 1);
}

/* --- Hero Section --- */
#hero {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 2rem;
}

.hero-title {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 500;
    font-size: clamp(3rem, 8vw, 7rem);
    letter-spacing: -0.02em;
    color: var(--deep-ink);
    text-shadow: 0 1px 2px rgba(0, 20, 60, 0.06);
    background: linear-gradient(180deg, var(--deep-ink) 0%, #243444 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    opacity: 0;
    filter: blur(8px);
    transform: translateY(12px);
    transition: opacity 1000ms cubic-bezier(0.25, 0.1, 0.25, 1),
                filter 1000ms cubic-bezier(0.25, 0.1, 0.25, 1),
                transform 1000ms cubic-bezier(0.25, 0.1, 0.25, 1);
}

.hero-title.revealed {
    opacity: 1;
    filter: blur(0);
    transform: translateY(0);
}

.hero-tagline {
    font-family: 'Inter', sans-serif;
    font-weight: 400;
    font-size: clamp(1rem, 2vw, 1.3rem);
    color: var(--slate-mist);
    text-transform: lowercase;
    margin-top: 1rem;
    opacity: 0;
    filter: blur(8px);
    transform: translateY(12px);
    transition: opacity 1000ms cubic-bezier(0.25, 0.1, 0.25, 1),
                filter 1000ms cubic-bezier(0.25, 0.1, 0.25, 1),
                transform 1000ms cubic-bezier(0.25, 0.1, 0.25, 1);
}

.hero-tagline.revealed {
    opacity: 1;
    filter: blur(0);
    transform: translateY(0);
}

/* --- Content Panels (Frosted Glass) --- */
.content-panel {
    position: relative;
    z-index: 2;
    width: 80vw;
    max-width: 900px;
    margin: 8vh auto;
    padding: clamp(2rem, 5vw, 4rem);
    background: rgba(240, 244, 248, 0.72);
    backdrop-filter: blur(16px) saturate(1.2);
    -webkit-backdrop-filter: blur(16px) saturate(1.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 8px 32px rgba(0, 20, 60, 0.08);
    border-radius: 2px;
    overflow: hidden;
    /* Gentle floating animation */
    animation: panelFloat 6s ease-in-out infinite;
    /* Scroll reveal initial state */
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 800ms cubic-bezier(0.25, 0.1, 0.25, 1),
                transform 800ms cubic-bezier(0.25, 0.1, 0.25, 1);
}

.content-panel.visible {
    opacity: 1;
    transform: translateY(0);
}

@keyframes panelFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-4px); }
}

.content-panel.visible {
    animation: panelFloat 6s ease-in-out infinite;
}

/* --- Panel Labels --- */
.panel-label {
    display: block;
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 300;
    font-size: clamp(0.75rem, 1.2vw, 0.9rem);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--slate-mist);
    margin-bottom: 1rem;
}

/* --- Panel Headings --- */
.content-panel h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 500;
    font-size: clamp(1.6rem, 3.5vw, 2.8rem);
    letter-spacing: -0.02em;
    color: var(--deep-ink);
    text-shadow: 0 1px 2px rgba(0, 20, 60, 0.06);
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

/* --- Panel Body Text --- */
.content-panel p {
    font-family: 'Inter', sans-serif;
    font-weight: 400;
    font-size: clamp(1rem, 1.8vw, 1.15rem);
    line-height: 1.75;
    color: var(--deep-ink);
    max-width: 38em;
}

/* --- Panel Dividers --- */
.panel-divider {
    width: 100%;
    height: 1px;
    background: rgba(0, 80, 120, 0.1);
    margin: 1.5rem 0;
}

/* --- Plot Line SVG Decorations --- */
.plot-line {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 60px;
    pointer-events: none;
    z-index: -1;
    opacity: 0;
}

.plot-line path {
    stroke-dasharray: 2000;
    stroke-dashoffset: 2000;
    transition: stroke-dashoffset 2s cubic-bezier(0.25, 0.1, 0.25, 1);
}

.content-panel.visible .plot-line {
    opacity: 1;
}

.content-panel.visible .plot-line path {
    stroke-dashoffset: 0;
}

/* --- CTA Link --- */
.cta-link {
    display: inline-block;
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 500;
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    color: var(--ember-glow);
    text-decoration: none;
    position: relative;
    padding: 0.5rem 1rem;
    cursor: pointer;
}

.cta-link::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    border: 2px solid var(--ember-glow);
    opacity: 0;
    transform: translate(-50%, -50%) scale(1);
    pointer-events: none;
}

.cta-link:hover::after {
    animation: sonarPing 600ms cubic-bezier(0.25, 0.1, 0.25, 1) forwards;
}

/* --- Pulse-Attention Sonar Ping --- */
@keyframes sonarPing {
    0% {
        opacity: 0.3;
        transform: translate(-50%, -50%) scale(1);
    }
    100% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(2);
    }
}

/* --- Interactive elements pulse --- */
a, button {
    position: relative;
}

/* --- Final CTA Panel --- */
.content-panel-final {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 20vh;
    text-align: center;
}

/* --- Footer --- */
#site-footer {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 4rem 2rem 3rem;
}

.footer-text {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 300;
    font-size: clamp(0.75rem, 1.2vw, 0.9rem);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--abyss-navy);
    opacity: 0.5;
}

/* --- Bubble Keyframes --- */
@keyframes bubbleRise {
    0% {
        transform: translateY(100vh) translateX(0);
        opacity: 0;
    }
    5% {
        opacity: var(--bubble-opacity, 0.4);
    }
    95% {
        opacity: var(--bubble-opacity, 0.4);
    }
    100% {
        transform: translateY(-20px) translateX(var(--bubble-drift, 20px));
        opacity: 0;
    }
}

@keyframes bubbleOscillate {
    0%, 100% { transform: translateX(0); }
    50% { transform: translateX(var(--bubble-drift, 15px)); }
}

/* --- Responsive: below 768px --- */
@media (max-width: 768px) {
    .content-panel {
        width: 94vw;
        padding: clamp(1.2rem, 4vw, 2rem);
    }

    .plot-line {
        display: none;
    }

    #caustic-layer {
        /* Static on mobile - handled by JS stopping animation */
    }
}

/* --- Selection Color --- */
::selection {
    background: rgba(74, 158, 200, 0.2);
    color: var(--deep-ink);
}