/* ============================================
   cbdc.study - Pop-Art Research Gallery
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    --polar-wash: #F0F5FA;
    --abyssal-navy: #0B1D3A;
    --ink-navy: #1A2A4A;
    --signal-coral: #FF6B6B;
    --beacon-yellow: #FFD93D;
    --depth-teal: #1B6B8A;
    --seafoam-mist: #C1D7E8;
    --trench-black: #060D18;

    --font-display: 'Anton', sans-serif;
    --font-body: 'IBM Plex Serif', serif;
    --font-mono: 'Space Mono', monospace;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--polar-wash);
    color: var(--ink-navy);
    overflow-x: hidden;
    line-height: 1.65;
    letter-spacing: 0.005em;
    font-size: clamp(0.95rem, 1.1vw, 1.1rem);
}

/* --- Particle Canvas --- */
#particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1000;
}

/* --- Currency Wallpaper --- */
.currency-wallpaper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    opacity: 0.06;
    background-image:
        url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='80' height='80' viewBox='0 0 80 80'%3E%3Ctext x='40' y='50' text-anchor='middle' font-size='36' font-family='Arial' fill='%23C1D7E8' transform='rotate(-12 40 40)'%3E%24%3C/text%3E%3C/svg%3E"),
        url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='80' height='80' viewBox='0 0 80 80'%3E%3Ctext x='40' y='50' text-anchor='middle' font-size='36' font-family='Arial' fill='%23C1D7E8' transform='rotate(8 40 40)'%3E%E2%82%AC%3C/text%3E%3C/svg%3E");
    background-size: 160px 160px, 160px 160px;
    background-position: 0 0, 80px 80px;
}

/* ============================================
   MASTHEAD
   ============================================ */
#masthead {
    position: relative;
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--polar-wash);
    overflow: hidden;
    z-index: 1;
}

.masthead-inner {
    text-align: center;
    position: relative;
    z-index: 2;
}

.masthead-title {
    font-family: var(--font-display);
    font-size: clamp(5rem, 12vw, 10rem);
    text-transform: uppercase;
    letter-spacing: 0.02em;
    line-height: 0.95;
    display: inline-block;
}

.masthead-title .letter {
    display: inline-block;
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.masthead-title .letter.visible {
    opacity: 1;
    transform: translateY(0);
}

.letter-c1 { color: var(--signal-coral); }
.letter-b { color: var(--depth-teal); }
.letter-d { color: var(--beacon-yellow); }
.letter-c2 { color: var(--abyssal-navy); }

.masthead-subtitle {
    font-family: var(--font-body);
    font-style: italic;
    font-weight: 500;
    font-size: clamp(1.2rem, 2vw, 2rem);
    color: #5B8FA8;
    margin-top: 0.2em;
    opacity: 0;
    transition: opacity 0.6s ease;
}

.masthead-subtitle.visible {
    opacity: 1;
}

.masthead-line {
    width: 0;
    height: 2px;
    background-color: var(--abyssal-navy);
    margin: 1.5rem auto;
    transition: width 1s ease;
}

.masthead-line.visible {
    width: 100%;
    max-width: 800px;
}

.masthead-tagline {
    font-family: var(--font-mono);
    font-size: clamp(0.7rem, 0.85vw, 0.85rem);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #5B8FA8;
    margin-top: 1rem;
    overflow: hidden;
}

.tagline-text {
    display: inline-block;
    clip-path: inset(0 100% 0 0);
    transition: clip-path 1.5s cubic-bezier(0.25, 0.1, 0.25, 1);
}

.tagline-text.visible {
    clip-path: inset(0 0% 0 0);
}

/* Benday dot overlay */
.benday-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    background-image: radial-gradient(circle, var(--seafoam-mist) 1px, transparent 1px);
    background-size: 8px 8px;
    opacity: 0.08;
}

/* ============================================
   PORTFOLIO GRID
   ============================================ */
#portfolio-grid {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 24px 60px;
}

/* --- Grid Cell Base --- */
.grid-cell {
    position: relative;
    overflow: hidden;
    min-height: 220px;
    transition: border-color 0.2s ease;
}

.grid-cell .cell-content {
    position: relative;
    z-index: 2;
    height: 100%;
}

/* Cell entrance animation */
.grid-cell {
    opacity: 0;
    transform: translateY(15px);
    transition: opacity 0.3s ease, transform 0.3s ease, border-color 0.2s ease;
}

.grid-cell.cell-visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Span classes --- */
.span-col-2 {
    grid-column: span 2;
}

.span-row-2 {
    grid-row: span 2;
}

/* ============================================
   RESEARCH CARD
   ============================================ */
.research-card {
    background-color: var(--polar-wash);
    border: 4px solid var(--abyssal-navy);
    padding: 24px;
    display: flex;
    flex-direction: column;
}

.research-card .cell-content {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.research-card:hover {
    border-color: var(--signal-coral);
}

.research-card .benday-overlay {
    opacity: 0.08;
    transition: opacity 0.2s ease;
}

.research-card:hover .benday-overlay {
    opacity: 0.20;
}

.cell-heading {
    font-family: var(--font-display);
    font-size: clamp(1.6rem, 3.5vw, 2.8rem);
    text-transform: uppercase;
    letter-spacing: 0.02em;
    line-height: 0.95;
    color: var(--abyssal-navy);
    margin-bottom: 12px;
}

.cell-abstract {
    font-family: var(--font-body);
    font-size: clamp(0.85rem, 1vw, 1rem);
    line-height: 1.55;
    color: var(--ink-navy);
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Speech bubble tag */
.speech-bubble-tag {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    align-self: flex-end;
}

.speech-bubble-tag .tag-text {
    font-family: var(--font-mono);
    font-size: clamp(0.6rem, 0.75vw, 0.75rem);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--polar-wash);
    background-color: var(--signal-coral);
    padding: 4px 10px;
    border: 3px solid var(--trench-black);
    border-radius: 12px;
}

.bubble-tail {
    display: block;
    margin-top: -2px;
}

/* ============================================
   DATA PANEL
   ============================================ */
.data-panel {
    background-color: var(--abyssal-navy);
    border: 4px solid var(--trench-black);
    padding: 32px 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

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

.data-number {
    font-family: var(--font-display);
    font-size: clamp(4rem, 10vw, 9rem);
    text-transform: uppercase;
    letter-spacing: 0.02em;
    line-height: 0.95;
    color: var(--signal-coral);
}

.data-number.data-yellow {
    color: var(--beacon-yellow);
}

.data-caption {
    font-family: var(--font-mono);
    font-size: clamp(0.65rem, 0.8vw, 0.8rem);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--seafoam-mist);
    margin-top: 8px;
}

/* ============================================
   QUOTE BLOCK
   ============================================ */
.quote-block {
    background-color: var(--signal-coral);
    border: 4px solid var(--trench-black);
    padding: 28px 20px 36px;
    display: flex;
    flex-direction: column;
    position: relative;
}

.quote-block .cell-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.quote-text {
    font-family: var(--font-display);
    font-size: clamp(1.2rem, 2.5vw, 2rem);
    text-transform: uppercase;
    letter-spacing: 0.02em;
    line-height: 1.05;
    color: var(--polar-wash);
    margin-bottom: 12px;
}

.quote-attribution {
    font-family: var(--font-body);
    font-style: italic;
    font-size: clamp(0.75rem, 0.9vw, 0.9rem);
    color: var(--polar-wash);
    opacity: 0.85;
}

.speech-bubble-tail-large {
    position: absolute;
    bottom: -14px;
    left: 30px;
    z-index: 3;
}

/* ============================================
   DIAGRAM CELL
   ============================================ */
.diagram-cell {
    background-color: var(--polar-wash);
    border: 4px solid var(--trench-black);
    padding: 20px;
}

.diagram-cell .cell-content {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.diagram-heading {
    font-size: clamp(1.4rem, 2.5vw, 2.2rem);
    margin-bottom: 12px;
    text-align: center;
}

.diagram-svg {
    width: 100%;
    max-width: 500px;
    height: auto;
}

.diagram-draw {
    opacity: 0;
    transition: opacity 0.4s ease;
}

.diagram-cell.cell-visible .diagram-draw {
    opacity: 1;
}

/* Stagger diagram elements */
.diagram-cell.cell-visible .diagram-draw:nth-child(1) { transition-delay: 0.1s; }
.diagram-cell.cell-visible .diagram-draw:nth-child(2) { transition-delay: 0.2s; }
.diagram-cell.cell-visible .diagram-draw:nth-child(3) { transition-delay: 0.3s; }
.diagram-cell.cell-visible .diagram-draw:nth-child(4) { transition-delay: 0.4s; }
.diagram-cell.cell-visible .diagram-draw:nth-child(5) { transition-delay: 0.5s; }
.diagram-cell.cell-visible .diagram-draw:nth-child(6) { transition-delay: 0.15s; }
.diagram-cell.cell-visible .diagram-draw:nth-child(7) { transition-delay: 0.25s; }
.diagram-cell.cell-visible .diagram-draw:nth-child(8) { transition-delay: 0.35s; }
.diagram-cell.cell-visible .diagram-draw:nth-child(9) { transition-delay: 0.45s; }
.diagram-cell.cell-visible .diagram-draw:nth-child(10) { transition-delay: 0.55s; }
.diagram-cell.cell-visible .diagram-draw:nth-child(11) { transition-delay: 0.6s; }
.diagram-cell.cell-visible .diagram-draw:nth-child(12) { transition-delay: 0.65s; }
.diagram-cell.cell-visible .diagram-draw:nth-child(13) { transition-delay: 0.7s; }
.diagram-cell.cell-visible .diagram-draw:nth-child(14) { transition-delay: 0.75s; }
.diagram-cell.cell-visible .diagram-draw:nth-child(15) { transition-delay: 0.8s; }
.diagram-cell.cell-visible .diagram-draw:nth-child(16) { transition-delay: 0.85s; }
.diagram-cell.cell-visible .diagram-draw:nth-child(17) { transition-delay: 0.3s; }
.diagram-cell.cell-visible .diagram-draw:nth-child(18) { transition-delay: 0.4s; }
.diagram-cell.cell-visible .diagram-draw:nth-child(19) { transition-delay: 0.5s; }
.diagram-cell.cell-visible .diagram-draw:nth-child(20) { transition-delay: 0.6s; }
.diagram-cell.cell-visible .diagram-draw:nth-child(21) { transition-delay: 0.7s; }
.diagram-cell.cell-visible .diagram-draw:nth-child(22) { transition-delay: 0.75s; }
.diagram-cell.cell-visible .diagram-draw:nth-child(23) { transition-delay: 0.8s; }
.diagram-cell.cell-visible .diagram-draw:nth-child(24) { transition-delay: 0.85s; }
.diagram-cell.cell-visible .diagram-draw:nth-child(25) { transition-delay: 0.9s; }

/* ============================================
   SKELETON CELLS
   ============================================ */
.skeleton-cell {
    background-color: var(--polar-wash);
    border: 4px solid var(--seafoam-mist);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    cursor: default;
    /* Skeletons are always visible */
    opacity: 1 !important;
    transform: none !important;
}

.skeleton-line {
    height: 14px;
    background-color: var(--seafoam-mist);
    border-radius: 4px;
    animation: skeleton-pulse 1.8s ease-in-out infinite;
}

.skeleton-line-long { width: 90%; }
.skeleton-line-medium { width: 65%; }
.skeleton-line-short { width: 40%; }

.skeleton-block {
    height: 60px;
    background-color: var(--seafoam-mist);
    border-radius: 4px;
    animation: skeleton-pulse 1.8s ease-in-out infinite;
    animation-delay: 0.3s;
}

@keyframes skeleton-pulse {
    0% { opacity: 0.4; }
    50% { opacity: 0.8; }
    100% { opacity: 0.4; }
}

.skeleton-cell:hover .skeleton-line,
.skeleton-cell:hover .skeleton-block {
    background-color: var(--signal-coral);
    transition: background-color 0.15s ease;
}

/* ============================================
   FOOTER
   ============================================ */
#site-footer {
    position: relative;
    z-index: 1;
    background-color: var(--abyssal-navy);
    padding: 30px 24px;
}

.footer-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 4px;
    max-width: 1440px;
    margin: 0 auto;
}

.footer-cell {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--depth-teal);
    transition: border-color 0.2s ease, background-color 0.2s ease;
}

.footer-cell:hover {
    border-color: var(--signal-coral);
    background-color: rgba(255, 107, 107, 0.1);
}

.footer-cell-accent {
    width: auto;
    padding: 0 16px;
    background-color: var(--signal-coral);
    border-color: var(--signal-coral);
}

.footer-cell-accent:hover {
    background-color: var(--beacon-yellow);
    border-color: var(--beacon-yellow);
}

.footer-icon {
    font-family: var(--font-display);
    font-size: 1.4rem;
    color: var(--seafoam-mist);
}

.footer-word {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--seafoam-mist);
    text-align: center;
}

.footer-cell-accent .footer-word {
    color: var(--polar-wash);
    font-weight: 700;
}

/* ============================================
   OVERLAY MENU
   ============================================ */
.overlay-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(11, 29, 58, 0.97);
    z-index: 900;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: translateY(100%);
    transition: transform 0.4s ease-out;
    pointer-events: none;
}

.overlay-menu.menu-open {
    transform: translateY(0);
    pointer-events: auto;
}

.menu-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    width: 90%;
    max-width: 600px;
}

.menu-cell {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 120px;
    border: 3px solid var(--trench-black);
    text-decoration: none;
    transition: transform 0.2s ease, border-color 0.2s ease;
    position: relative;
    overflow: hidden;
}

.menu-cell:hover {
    transform: scale(1.04);
    border-color: var(--beacon-yellow);
}

.menu-cell-1 { background-color: var(--signal-coral); }
.menu-cell-2 { background-color: var(--depth-teal); }
.menu-cell-3 { background-color: var(--beacon-yellow); }
.menu-cell-4 { background-color: var(--abyssal-navy); border-color: var(--depth-teal); }
.menu-cell-5 { background-color: var(--signal-coral); }
.menu-cell-6 { background-color: var(--depth-teal); }

/* Benday dots on menu cells */
.menu-cell::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(circle, rgba(6, 13, 24, 0.12) 2px, transparent 2px);
    background-size: 12px 12px;
    pointer-events: none;
}

.menu-label {
    font-family: var(--font-display);
    font-size: clamp(1.4rem, 3vw, 2.2rem);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--polar-wash);
    position: relative;
    z-index: 2;
}

.menu-cell-3 .menu-label {
    color: var(--trench-black);
}

/* ============================================
   MENU TOGGLE BUTTON
   ============================================ */
.menu-toggle {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background-color: var(--signal-coral);
    border: none;
    cursor: pointer;
    z-index: 950;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    transition: transform 0.3s ease;
    box-shadow: none;
}

.menu-toggle:hover {
    transform: scale(1.08);
}

.menu-toggle.menu-active {
    transform: rotate(90deg);
}

.hamburger-line {
    display: block;
    width: 24px;
    height: 3px;
    background-color: var(--polar-wash);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.menu-toggle.menu-active .hamburger-line:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.menu-toggle.menu-active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.menu-toggle.menu-active .hamburger-line:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* ============================================
   RESPONSIVE
   ============================================ */

/* Tablet */
@media (max-width: 1199px) and (min-width: 768px) {
    #portfolio-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 8px;
    }

    .span-col-2 {
        grid-column: span 2;
    }
}

/* Mobile */
@media (max-width: 767px) {
    #portfolio-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 6px;
        padding: 0 12px 40px;
    }

    .span-col-2 {
        grid-column: span 2;
    }

    .span-row-2 {
        grid-row: span 1;
    }

    .grid-cell {
        min-height: 180px;
    }

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

    .menu-toggle {
        bottom: 16px;
        right: auto;
        left: 50%;
        transform: translateX(-50%);
    }

    .menu-toggle.menu-active {
        transform: translateX(-50%) rotate(90deg);
    }

    .menu-toggle:hover {
        transform: translateX(-50%) scale(1.08);
    }

    .menu-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-cell {
        width: 48px;
        height: 48px;
    }

    .footer-icon {
        font-size: 1.1rem;
    }

    .footer-word {
        font-size: 0.5rem;
    }
}

/* ============================================
   REDUCED MOTION
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .masthead-title .letter {
        opacity: 1;
        transform: none;
    }

    .masthead-subtitle {
        opacity: 1;
    }

    .masthead-line {
        width: 100%;
        max-width: 800px;
    }

    .tagline-text {
        clip-path: none;
    }

    .grid-cell {
        opacity: 1;
        transform: none;
    }

    .diagram-draw {
        opacity: 1;
    }

    #particle-canvas {
        display: none;
    }
}