/* ppuzzle.org — Frutiger Aero HUD Instrument Design */

/* ===== RESET & BASE ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'Source Sans 3', sans-serif;
    font-weight: 400;
    color: #c8dde8;
    background: #0a1e2e;
    overflow-x: hidden;
    line-height: 1.65;
    letter-spacing: 0.01em;
    -webkit-font-smoothing: antialiased;
}

/* ===== Z-LAYER 0: BACKGROUND ===== */
#background-layer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    background: linear-gradient(175deg, #0a1e2e 0%, #0f2a3a 40%, #132e3f 70%, #0d2535 100%);
}

#background-layer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 1px,
            rgba(139, 104, 66, 0.015) 1px,
            rgba(139, 104, 66, 0.015) 2px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(139, 104, 66, 0.01) 2px,
            rgba(139, 104, 66, 0.01) 4px
        );
    mix-blend-mode: multiply;
    pointer-events: none;
}

#background-layer::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at 30% 20%, rgba(107, 178, 210, 0.04) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 80%, rgba(60, 207, 170, 0.02) 0%, transparent 50%);
    pointer-events: none;
}

/* ===== Z-LAYER 1: PARTICLE LAYER ===== */
#particle-layer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
    overflow: hidden;
}

.bokeh-particle {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(107, 178, 210, 0.12) 0%, transparent 70%);
    pointer-events: none;
}

/* ===== Z-LAYER 3: HUD BRACKETS ===== */
.hud-bracket {
    position: fixed;
    z-index: 10;
    animation: bracketPulse 4s ease-in-out infinite;
}

.hud-bracket-tl { top: 24px; left: 24px; }
.hud-bracket-tr { top: 24px; right: 24px; }
.hud-bracket-bl { bottom: 72px; left: 24px; }
.hud-bracket-br { bottom: 72px; right: 24px; }

@keyframes bracketPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.02); }
}

/* ===== Z-LAYER 4: WATER DROPLETS ===== */
.water-droplet {
    position: fixed;
    z-index: 15;
    border-radius: 50%;
    background: radial-gradient(ellipse at 30% 30%, rgba(255,255,255,0.4) 0%, rgba(107, 178, 210, 0.15) 40%, transparent 70%);
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    pointer-events: none;
}

.water-droplet-1 {
    width: 8px;
    height: 8px;
    top: 15%;
    right: 12%;
    animation: dropletSlide1 15s linear infinite;
}

.water-droplet-2 {
    width: 6px;
    height: 6px;
    top: 35%;
    left: 8%;
    animation: dropletSlide2 20s linear infinite;
    animation-delay: -5s;
}

.water-droplet-3 {
    width: 10px;
    height: 10px;
    top: 55%;
    right: 30%;
    opacity: 0.7;
}

@keyframes dropletSlide1 {
    0% { transform: translateY(0); opacity: 0.8; }
    80% { opacity: 0.6; }
    100% { transform: translateY(120px); opacity: 0; }
}

@keyframes dropletSlide2 {
    0% { transform: translateY(0); opacity: 0.7; }
    80% { opacity: 0.5; }
    100% { transform: translateY(150px); opacity: 0; }
}

/* ===== SCROLL CONTAINER ===== */
#scroll-container {
    position: relative;
    z-index: 5;
}

.hud-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 80px 24px;
}

/* ===== SECTION 1: CALIBRATION ===== */
#calibration-content {
    text-align: center;
    opacity: 0;
    animation: calibrationFadeIn 2s cubic-bezier(0.4, 0, 0.2, 1) 0.5s forwards;
}

.display-title {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    font-size: clamp(3.5rem, 9vw, 7rem);
    color: #e8f0f6;
    letter-spacing: 0.02em;
    line-height: 1.1;
    margin-bottom: 0.4em;
    text-shadow: 0 0 40px rgba(107, 178, 210, 0.2);
}

.subtitle-text {
    font-family: 'Source Sans 3', sans-serif;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.15em;
    color: #8ca8b8;
}

@keyframes calibrationFadeIn {
    0% { opacity: 0; transform: translateY(10px); }
    100% { opacity: 1; transform: translateY(0); }
}

/* ===== GLASS PANEL (Frosted) ===== */
.glass-panel {
    position: relative;
    background: rgba(15, 42, 58, 0.6);
    backdrop-filter: blur(16px) saturate(1.3) brightness(1.05);
    -webkit-backdrop-filter: blur(16px) saturate(1.3) brightness(1.05);
    border: 1px solid rgba(107, 178, 210, 0.15);
    border-radius: 12px;
    box-shadow:
        inset 0 1px 0 rgba(255,255,255,0.08),
        0 8px 32px rgba(0,0,0,0.3);
    background-image: linear-gradient(135deg, rgba(200, 221, 232, 0.08) 0%, rgba(107, 178, 210, 0.04) 100%);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1), transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.glass-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, rgba(200, 221, 232, 0.15) 30%, rgba(200, 221, 232, 0.15) 70%, transparent 100%);
    border-radius: 12px 12px 0 0;
}

.glass-panel-center {
    width: 60%;
    max-width: 800px;
    max-height: 70vh;
    overflow-y: auto;
    display: flex;
}

.glass-panel-left {
    width: 40%;
    max-width: 520px;
    max-height: 65vh;
    overflow-y: auto;
    display: flex;
}

.glass-panel-wide {
    width: 70%;
    max-width: 900px;
    max-height: 75vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

/* ===== LEATHER BEZEL BORDER ===== */
.panel-leather-border {
    position: absolute;
    left: 0;
    top: 12px;
    bottom: 12px;
    width: 3px;
    background: linear-gradient(180deg, #8b6842 0%, #5a3d28 100%);
    border-radius: 2px;
}

.panel-inner {
    padding: 32px 36px 32px 42px;
    flex: 1;
}

/* ===== CHAPTER LABELS & TITLES ===== */
.chapter-label {
    font-family: 'Source Sans 3', sans-serif;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    color: #8ca8b8;
    display: block;
    margin-bottom: 8px;
}

.chapter-title {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    font-size: clamp(2rem, 5vw, 3rem);
    color: #e8f0f6;
    letter-spacing: 0.02em;
    line-height: 1.1;
    margin-bottom: 24px;
}

.chapter-body p {
    font-family: 'Source Sans 3', sans-serif;
    font-weight: 400;
    font-size: clamp(0.95rem, 1.8vw, 1.15rem);
    color: #c8dde8;
    line-height: 1.65;
    letter-spacing: 0.01em;
    margin-bottom: 16px;
}

.chapter-body p strong {
    font-weight: 600;
    color: #e8f0f6;
}

/* ===== CHAPTER 02: INFO CHIPS ===== */
#section-chapter02 {
    flex-direction: row;
    gap: 40px;
    flex-wrap: wrap;
}

.info-chips-group {
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-self: center;
}

.info-chip {
    background: rgba(15, 42, 58, 0.6);
    backdrop-filter: blur(12px) saturate(1.2);
    -webkit-backdrop-filter: blur(12px) saturate(1.2);
    border: 1px solid rgba(107, 178, 210, 0.15);
    border-radius: 20px;
    padding: 8px 20px;
    min-width: 200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.5s cubic-bezier(0.4, 0, 0.2, 1), transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow:
        inset 0 1px 0 rgba(255,255,255,0.06),
        0 4px 16px rgba(0,0,0,0.2);
}

.info-chip.visible {
    opacity: 1;
    transform: translateX(0);
}

.info-chip-1.visible { transition-delay: 0s; }
.info-chip-2.visible { transition-delay: 0.3s; }
.info-chip-3.visible { transition-delay: 0.6s; }

.chip-label {
    font-family: 'Source Sans 3', sans-serif;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.65rem;
    letter-spacing: 0.15em;
    color: #8ca8b8;
}

.chip-value {
    font-family: 'Share Tech Mono', monospace;
    font-size: clamp(0.85rem, 1.4vw, 1rem);
    letter-spacing: 0.08em;
    color: #6bb2d2;
    font-variant-numeric: tabular-nums;
}

/* ===== CHAPTER 03: PUZZLE ASSEMBLY ===== */
.puzzle-assembly-container {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.puzzle-svg {
    width: 100%;
    max-width: 350px;
    height: auto;
}

.puzzle-piece {
    fill: none;
    stroke: #6bb2d2;
    stroke-width: 1.5;
    opacity: 0.7;
    transition: transform 8s cubic-bezier(0.4, 0, 0.2, 1);
}

.puzzle-piece.scattered {
    opacity: 0.5;
}

.puzzle-piece.assembled {
    opacity: 0.9;
}

/* Individual scattered transforms */
.piece-1.scattered { transform: translate(-60px, -40px) rotate(15deg); }
.piece-2.scattered { transform: translate(40px, -60px) rotate(-20deg); }
.piece-3.scattered { transform: translate(70px, 30px) rotate(10deg); }
.piece-4.scattered { transform: translate(-30px, 50px) rotate(-15deg); }
.piece-5.scattered { transform: translate(50px, -45px) rotate(25deg); }
.piece-6.scattered { transform: translate(-55px, 35px) rotate(-10deg); }
.piece-7.scattered { transform: translate(35px, 55px) rotate(30deg); }
.piece-8.scattered { transform: translate(-40px, -55px) rotate(-25deg); }
.piece-9.scattered { transform: translate(65px, 40px) rotate(20deg); }
.piece-10.scattered { transform: translate(-50px, -30px) rotate(-30deg); }
.piece-11.scattered { transform: translate(45px, 50px) rotate(15deg); }
.piece-12.scattered { transform: translate(-35px, 60px) rotate(-20deg); }
.piece-13.scattered { transform: translate(55px, -50px) rotate(10deg); }
.piece-14.scattered { transform: translate(-60px, 45px) rotate(-15deg); }
.piece-15.scattered { transform: translate(30px, -35px) rotate(25deg); }
.piece-16.scattered { transform: translate(-45px, -60px) rotate(-10deg); }

.piece-1.assembled,
.piece-2.assembled,
.piece-3.assembled,
.piece-4.assembled,
.piece-5.assembled,
.piece-6.assembled,
.piece-7.assembled,
.piece-8.assembled,
.piece-9.assembled,
.piece-10.assembled,
.piece-11.assembled,
.piece-12.assembled,
.piece-13.assembled,
.piece-14.assembled,
.piece-15.assembled,
.piece-16.assembled {
    transform: translate(0, 0) rotate(0deg);
}

/* ===== CHAPTER 04: SPLIT PANELS ===== */
.glass-panel-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2px;
    width: 70%;
    max-width: 900px;
}

.glass-panel-split .glass-panel {
    border-radius: 12px;
    max-height: 65vh;
    overflow-y: auto;
    display: flex;
}

.glass-panel-split .split-left {
    border-radius: 12px 0 0 12px;
}

.glass-panel-split .split-right {
    border-radius: 0 12px 12px 0;
}

/* ===== SECTION 6: STANDBY ===== */
#standby-message {
    text-align: center;
    opacity: 0;
    transition: opacity 3s cubic-bezier(0.4, 0, 0.2, 1);
}

#standby-message.visible {
    opacity: 1;
}

#standby-message.dimmed {
    opacity: 0.2;
    transition: opacity 5s cubic-bezier(0.4, 0, 0.2, 1);
}

.standby-text {
    font-family: 'Share Tech Mono', monospace;
    font-size: clamp(0.85rem, 2vw, 1.1rem);
    color: #3ccfaa;
    letter-spacing: 0.08em;
    font-variant-numeric: tabular-nums;
}

/* ===== STATUS BAR ===== */
#status-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 48px;
    background: rgba(15, 30, 45, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-top: 1px solid rgba(107, 178, 210, 0.15);
    border-image: linear-gradient(90deg, #5a3d28, #8b6842, #5a3d28) 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 48px;
    z-index: 20;
    padding: 0 24px;
}

.status-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.status-label {
    font-family: 'Source Sans 3', sans-serif;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.6rem;
    letter-spacing: 0.15em;
    color: #8ca8b8;
}

.status-value {
    font-family: 'Share Tech Mono', monospace;
    font-weight: 400;
    font-size: clamp(0.75rem, 1.2vw, 0.9rem);
    letter-spacing: 0.08em;
    color: #6bb2d2;
    font-variant-numeric: tabular-nums;
    min-width: 100px;
}

/* ===== SCROLLBAR STYLING ===== */
.glass-panel::-webkit-scrollbar {
    width: 4px;
}

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

.glass-panel::-webkit-scrollbar-thumb {
    background: rgba(107, 178, 210, 0.2);
    border-radius: 2px;
}

/* ===== RESPONSIVE (below 768px) ===== */
@media (max-width: 768px) {
    .hud-bracket svg {
        width: 40px;
        height: 40px;
    }
    .hud-bracket-tl { top: 12px; left: 12px; }
    .hud-bracket-tr { top: 12px; right: 12px; }
    .hud-bracket-bl { bottom: 60px; left: 12px; }
    .hud-bracket-br { bottom: 60px; right: 12px; }

    .glass-panel-center,
    .glass-panel-left,
    .glass-panel-wide {
        width: 90%;
        max-width: none;
        backdrop-filter: blur(8px) saturate(1.2);
        -webkit-backdrop-filter: blur(8px) saturate(1.2);
    }

    .glass-panel-split {
        grid-template-columns: 1fr;
        width: 90%;
        max-width: none;
    }

    .glass-panel-split .split-left {
        border-radius: 12px 12px 0 0;
    }

    .glass-panel-split .split-right {
        border-radius: 0 0 12px 12px;
    }

    #section-chapter02 {
        flex-direction: column;
        align-items: center;
    }

    .info-chips-group {
        flex-direction: column;
        align-items: center;
    }

    .status-item-depth,
    .status-item-pieces {
        display: none;
    }

    .panel-inner {
        padding: 24px 20px 24px 28px;
    }

    .hud-section {
        padding: 60px 16px;
    }
}

/* ===== BRACKET STANDBY ANIMATION ===== */
.hud-bracket.standby {
    transition: all 3s cubic-bezier(0.4, 0, 0.2, 1);
}

.hud-bracket-tl.standby { transform: translate(10px, 10px) scale(1); }
.hud-bracket-tr.standby { transform: translate(-10px, 10px) scale(1); }
.hud-bracket-bl.standby { transform: translate(10px, -10px) scale(1); }
.hud-bracket-br.standby { transform: translate(-10px, -10px) scale(1); }

/* ===== STATUS BAR FROZEN STATE ===== */
#status-bar.frozen {
    opacity: 0.5;
    transition: opacity 2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== HOVER & ALERT STATES ===== */
.glass-panel:hover {
    border-color: rgba(168, 212, 226, 0.25);
}

.info-chip:hover {
    border-color: #a8d4e2;
}

.status-value.alert {
    color: #e06050;
}