/* climate time machine styles */

/* variables */
:root {
    --bg-primary: #0f172a;
    --bg-secondary: rgba(15, 23, 42, 0.75);
    --bg-glass: rgba(15, 23, 42, 0.55);
    --border-glass: rgba(148, 163, 184, 0.15);
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #38bdf8;
    --accent-glow: rgba(56, 189, 248, 0.25);
    --temp-cold: #2166ac;
    --temp-warm: #b2182b;
    --co2-color: #22d3ee;
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --shadow-glow: 0 0 40px rgba(56, 189, 248, 0.08);
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
}

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

html, body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
    height: 100%;
    width: 100%;
}

/* full-screen globe container */
#viz-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

/* info panel */
/* fixed height so it doesn't resize with content */
#info-panel {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 10;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-glass);
    padding: 24px 22px;
    border-radius: var(--radius-lg);
    width: 300px;
    box-shadow: var(--shadow-glow);
    transition: opacity var(--transition-normal);
}

#app-title {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 2px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* year display */
#year-display {
    margin: 8px 0 14px;
}

#current-year {
    font-size: 2.8rem;
    font-weight: 300;
    letter-spacing: -0.04em;
    line-height: 1;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
    transition: color var(--transition-normal);
}

/* stats */
#stats {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 14px;
}

.stat-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 7px 10px;
    background: rgba(255, 255, 255, 0.04);
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
}

.stat-label {
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.stat-value {
    font-size: 0.95rem;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

.stat-value.warm {
    color: var(--temp-warm);
}

.stat-value.cool {
    color: var(--temp-cold);
}

.stat-value.co2 {
    color: var(--co2-color);
}

/* birth year section */
#birth-year-section {
    border-top: 1px solid var(--border-glass);
    padding-top: 12px;
}

#birth-year-section label {
    font-size: 0.68rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-secondary);
    display: block;
    margin-bottom: 6px;
}

#birth-year-form {
    display: flex;
    gap: 6px;
}

#birth-year-input {
    flex: 1;
    padding: 7px 10px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 0.82rem;
    font-variant-numeric: tabular-nums;
    outline: none;
    transition: border-color var(--transition-fast);
    /* remove spinner arrows on number input */
    -moz-appearance: textfield;
}

#birth-year-input::-webkit-outer-spin-button,
#birth-year-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

#birth-year-input::placeholder {
    color: var(--text-muted);
}

#birth-year-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

#birth-year-btn {
    padding: 7px 14px;
    background: var(--accent);
    color: var(--bg-primary);
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-family);
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition-fast), transform var(--transition-fast);
}

#birth-year-btn:hover {
    background: #7dd3fc;
    transform: scale(1.04);
}

#birth-year-btn:active {
    transform: scale(0.97);
}

/* birth year stats */
#birth-year-stats {
    margin-top: 8px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    animation: birthStatsIn 0.4s ease;
}

@keyframes birthStatsIn {
    from {
        opacity: 0;
        transform: translateY(-4px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.birth-stat-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 6px 10px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-sm);
}

.birth-stat-label {
    font-size: 0.68rem;
    color: var(--text-muted);
}

.birth-stat-value {
    font-size: 0.85rem;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    color: var(--text-primary);
}

#birth-temp-diff {
    color: var(--temp-warm);
}

#birth-co2-diff {
    color: var(--co2-color);
}

/* sparkline charts */
#sparklines {
    position: fixed;
    left: 24px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 10;
    display: flex;
    flex-direction: column;
    gap: 16px;
    width: 280px;
}

.sparkline-chart {
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 12px 14px 8px;
    box-shadow: var(--shadow-glow);
}

.sparkline-label {
    font-size: 0.62rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.sparkline-unit {
    font-weight: 400;
    color: var(--text-muted);
    text-transform: none;
}

.sparkline-chart svg {
    width: 100%;
    height: 120px;
    display: block;
    overflow: visible;
}

/* svg styles */
.sparkline-baseline {
    stroke: var(--text-muted);
    stroke-width: 1;
    stroke-dasharray: 3 3;
    opacity: 0.4;
}

.sparkline-path {
    fill: none;
    stroke-width: 1.5;
    stroke-linejoin: round;
    stroke-linecap: round;
}

.sparkline-dot {
    transition: cx 60ms ease, cy 60ms ease;
}

.sparkline-value-label {
    font-family: var(--font-family);
    font-size: 10px;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

/* bottom controls */
#controls {
    position: fixed;
    bottom: 56px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-glass);
    padding: 12px 24px;
    border-radius: 50px;
    box-shadow: var(--shadow-glow);
    min-width: 420px;
}

/* play / pause button */
#play-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid var(--accent);
    background: transparent;
    color: var(--accent);
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all var(--transition-fast);
    line-height: 1;
    padding-left: 2px; /* optical centering for ▶ */
}

#play-btn:hover {
    background: var(--accent);
    color: var(--bg-primary);
}

#play-btn:active {
    transform: scale(0.92);
}

#play-btn.playing {
    background: var(--accent);
    color: var(--bg-primary);
    padding-left: 0;
}

/* custom range slider */
#year-slider {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    background: linear-gradient(to right, var(--temp-cold), var(--text-muted) 50%, var(--temp-warm));
    border-radius: 3px;
    outline: none;
    cursor: pointer;
}

/* webkit thumb */
#year-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--text-primary);
    border: 3px solid var(--accent);
    box-shadow: 0 0 10px var(--accent-glow);
    cursor: grab;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

#year-slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: 0 0 16px var(--accent-glow);
}

#year-slider::-webkit-slider-thumb:active {
    cursor: grabbing;
    transform: scale(1.1);
}

/* firefox thumb */
#year-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--text-primary);
    border: 3px solid var(--accent);
    box-shadow: 0 0 10px var(--accent-glow);
    cursor: grab;
}

#year-slider::-moz-range-track {
    height: 6px;
    background: linear-gradient(to right, var(--temp-cold), var(--text-muted) 50%, var(--temp-warm));
    border-radius: 3px;
    border: none;
}

/* slider year label */
#slider-year-label {
    font-size: 0.85rem;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    color: var(--text-secondary);
    min-width: 40px;
    text-align: right;
}

/* footer */
#footer {
    position: fixed;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    text-align: center;
    font-size: 0.68rem;
    color: var(--text-muted);
    max-width: 600px;
    line-height: 1.5;
}

#footer a {
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

#footer a:hover {
    color: #7dd3fc;
}

#data-callout {
    margin-bottom: 4px;
}

#data-callout p {
    font-style: italic;
}

#data-callout cite {
    font-style: normal;
}

/* mobile responsive */
@media (max-width: 768px) {
    #info-panel {
        top: auto;
        bottom: 140px;
        right: 12px;
        left: 12px;
        width: auto;
        padding: 18px 14px;
    }

    #app-title {
        font-size: 1rem;
    }

    #current-year {
        font-size: 2rem;
    }

    #controls {
        bottom: 80px;
        min-width: 0;
        width: calc(100% - 24px);
        padding: 10px 16px;
    }

    #footer {
        bottom: 6px;
        font-size: 0.6rem;
        padding: 0 12px;
    }

    #keyboard-hints {
        display: none;
    }

    #sparklines {
        display: none;
    }
}

/* loading overlay */
#loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 100;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.8s ease, visibility 0.8s ease;
}

#loading-overlay.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

#loading-content {
    text-align: center;
}

#loading-globe {
    font-size: 4rem;
    animation: loadingSpin 2s linear infinite;
    margin-bottom: 16px;
}

@keyframes loadingSpin {
    from { transform: rotateY(0deg); }
    to { transform: rotateY(360deg); }
}

#loading-text {
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--text-secondary);
    letter-spacing: 0.04em;
    animation: loadingPulse 1.5s ease-in-out infinite;
}

@keyframes loadingPulse {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

/* speed button */
#speed-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1.5px solid var(--border-glass);
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-family);
    font-size: 0.7rem;
    font-weight: 600;
    cursor: pointer;
    flex-shrink: 0;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

#speed-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

#speed-btn:active {
    transform: scale(0.92);
}

/* keyboard hints */
#keyboard-hints {
    position: fixed;
    bottom: 56px;
    left: 24px;
    z-index: 10;
    display: flex;
    flex-direction: column;
    gap: 6px;
    opacity: 0.7;
    transition: opacity 1s ease;
    animation: hintsIn 0.6s ease 1s both;
}

#keyboard-hints.faded {
    opacity: 0;
}

.hint-key {
    display: inline-block;
    padding: 4px 10px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border-glass);
    border-radius: 6px;
    font-family: var(--font-family);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
    min-width: 44px;
    text-align: center;
    margin-right: 8px;
}

.hint-action {
    font-size: 0.72rem;
    color: var(--text-muted);
    font-weight: 400;
}

@keyframes hintsIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 0.7; transform: translateY(0); }
}

/* scrollbar */
#info-panel::-webkit-scrollbar {
    width: 4px;
}

#info-panel::-webkit-scrollbar-track {
    background: transparent;
}

#info-panel::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 2px;
}