/* styles.css - The Algorithm Mirror
   Refined dark/aurora design system. Structure & hooks unchanged;
   this is a visual + UX pass only. */

/* ============================================================
   Design tokens
   ============================================================ */
:root {
    /* Surfaces */
    --bg: #07070c;
    --surface-1: rgba(255, 255, 255, 0.028);
    --surface-2: rgba(255, 255, 255, 0.05);
    --surface-3: rgba(255, 255, 255, 0.08);
    --panel: rgba(12, 12, 18, 0.92);

    /* Borders */
    --border: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.16);

    /* Text */
    --text: #f4f4f8;
    --text-2: #a9abbd;
    --text-3: #6f7186;

    /* Brand */
    --accent-a: #667eea;
    --accent-b: #764ba2;
    --accent: #818cf8;
    --accent-soft: rgba(102, 126, 234, 0.14);
    --accent-line: rgba(102, 126, 234, 0.32);
    --grad: linear-gradient(135deg, var(--accent-a) 0%, var(--accent-b) 100%);

    /* Status */
    --success: #34d399;
    --warning: #fbbf24;
    --danger: #f87171;

    /* Radii */
    --r-sm: 8px;
    --r: 12px;
    --r-lg: 16px;
    --r-xl: 22px;

    /* Elevation */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 24px 70px rgba(0, 0, 0, 0.5);
    --glow: 0 0 0 1px var(--accent-line), 0 16px 40px rgba(102, 126, 234, 0.22);

    /* Motion */
    --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
    --t: 200ms var(--ease);
    --t-slow: 420ms var(--ease);

    /* Type */
    --font-display: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;

    /* Layout */
    --nav-h: 74px;
    --panel-w: 400px;
}

/* ============================================================
   Reset & base
   ============================================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html { -webkit-text-size-adjust: 100%; }

body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--text);
    overflow-x: hidden;
    line-height: 1.6;
    font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

/* Ambient aurora backdrop for the app shell */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background:
        radial-gradient(60% 55% at 82% 12%, rgba(118, 75, 162, 0.16), transparent 60%),
        radial-gradient(50% 50% at 10% 8%, rgba(102, 126, 234, 0.14), transparent 55%);
}

button, input, select { font-family: inherit; }

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 6px;
}
:focus:not(:focus-visible) { outline: none; }

/* ============================================================
   Upload screen
   ============================================================ */
#upload-screen {
    position: fixed;
    inset: 0;
    background:
        radial-gradient(70% 60% at 50% 0%, rgba(118, 75, 162, 0.22), transparent 60%),
        linear-gradient(160deg, #08080f 0%, #12122a 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    transition: opacity var(--t-slow), visibility var(--t-slow);
    padding: 24px;
}

#upload-screen.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.upload-container {
    text-align: center;
    max-width: 620px;
    width: 100%;
    padding: 40px;
    animation: fadeInUp 0.7s var(--ease) both;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(22px); }
    to   { opacity: 1; transform: translateY(0); }
}

.upload-container h1 {
    font-family: var(--font-display);
    font-size: clamp(38px, 6vw, 56px);
    line-height: 1.05;
    letter-spacing: -0.02em;
    margin-bottom: 18px;
    background: linear-gradient(135deg, #fff 0%, var(--accent-a) 55%, var(--accent-b) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 700;
}

.upload-container > p {
    color: var(--text-2);
    margin-bottom: 40px;
    font-size: clamp(15px, 2vw, 19px);
    max-width: 46ch;
    margin-inline: auto;
}

.upload-box {
    position: relative;
    border: 1.5px dashed var(--border-strong);
    border-radius: var(--r-xl);
    padding: 56px 40px;
    cursor: pointer;
    transition: transform var(--t), border-color var(--t), background var(--t), box-shadow var(--t);
    background: var(--surface-1);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

.upload-box:hover {
    border-color: var(--accent-a);
    background: var(--accent-soft);
    transform: translateY(-3px);
    box-shadow: var(--glow);
}

.upload-box.dragover {
    border-color: var(--accent-b);
    border-style: solid;
    background: rgba(118, 75, 162, 0.14);
    transform: scale(1.01);
    box-shadow: var(--glow);
}

.upload-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 22px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: var(--grad);
    color: #fff;
    box-shadow: 0 12px 28px rgba(102, 126, 234, 0.4);
    animation: floaty 4s ease-in-out infinite;
}
.upload-icon svg { width: 28px; height: 28px; display: block; }

@keyframes floaty {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-6px); }
}

.upload-text {
    font-family: var(--font-display);
    font-size: 21px;
    font-weight: 600;
    letter-spacing: -0.01em;
    margin-bottom: 10px;
}

.upload-subtext {
    color: var(--text-3);
    font-size: 14px;
    line-height: 1.7;
}
.upload-subtext small { color: #55566a; }

.sample-data-btn {
    margin-top: 28px;
    padding: 13px 26px;
    background: transparent;
    border: 1px solid var(--border-strong);
    color: var(--text-2);
    border-radius: var(--r);
    cursor: pointer;
    transition: all var(--t);
    font-size: 14px;
    font-weight: 500;
}

.sample-data-btn:hover {
    border-color: var(--accent-a);
    color: #fff;
    background: var(--accent-soft);
    transform: translateY(-2px);
}

/* ============================================================
   Navigation
   ============================================================ */
.nav {
    background: rgba(8, 8, 12, 0.72);
    backdrop-filter: blur(16px) saturate(140%);
    -webkit-backdrop-filter: blur(16px) saturate(140%);
    border-bottom: 1px solid var(--border);
    padding: 0 32px;
    height: var(--nav-h);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 18px;
    position: fixed;
    inset: 0 0 auto 0;
    z-index: 100;
}

.nav-title {
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.01em;
    white-space: nowrap;
    background: var(--grad);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.view-tabs {
    display: flex;
    gap: 6px;
    padding: 5px;
    background: var(--surface-1);
    border: 1px solid var(--border);
    border-radius: 999px;
    flex-wrap: wrap;
    justify-content: center;
}

.tab-btn {
    padding: 9px 18px;
    background: transparent;
    border: none;
    color: var(--text-2);
    border-radius: 999px;
    cursor: pointer;
    transition: color var(--t), background var(--t), box-shadow var(--t);
    font-size: 13.5px;
    font-weight: 500;
    white-space: nowrap;
}

.tab-btn:hover { color: #fff; background: var(--surface-2); }

.tab-btn.active {
    background: var(--grad);
    color: #fff;
    box-shadow: 0 6px 18px rgba(102, 126, 234, 0.35);
}

.nav-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.action-btn {
    padding: 9px 16px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: var(--r-sm);
    cursor: pointer;
    transition: background var(--t), transform var(--t), border-color var(--t);
    font-size: 13px;
    font-weight: 500;
    white-space: nowrap;
}

.action-btn:hover {
    background: var(--surface-3);
    border-color: var(--border-strong);
    transform: translateY(-1px);
}
.action-btn:active { transform: translateY(0); }

/* ============================================================
   Main content
   ============================================================ */
.main-content {
    margin-top: var(--nav-h);
    display: flex;
    height: calc(100vh - var(--nav-h));
    position: relative;
    z-index: 1;
}

.visualization-container {
    flex: 1;
    position: relative;
    background:
        radial-gradient(80% 80% at 50% 40%, rgba(102, 126, 234, 0.05), transparent 70%),
        #07070c;
    min-width: 0;
}

#particle-canvas { width: 100%; height: 100%; }
#particle-canvas canvas { display: block; }

#pixel-portrait-container {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px;
}

#pixel-canvas {
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: crosshair;
    image-rendering: pixelated;
    image-rendering: -moz-crisp-edges;
    image-rendering: crisp-edges;
    max-width: 100%;
    max-height: 100%;
    box-shadow: var(--shadow-lg);
}

/* ============================================================
   Metrics panel
   ============================================================ */
.metrics-panel {
    width: var(--panel-w);
    flex-shrink: 0;
    background: var(--panel);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-left: 1px solid var(--border);
    padding: 26px 24px 40px;
    overflow-y: auto;
    max-height: calc(100vh - var(--nav-h));
    scrollbar-width: thin;
    scrollbar-color: var(--accent-line) transparent;
}

.metrics-panel::-webkit-scrollbar { width: 9px; }
.metrics-panel::-webkit-scrollbar-track { background: transparent; }
.metrics-panel::-webkit-scrollbar-thumb {
    background: var(--accent-line);
    border-radius: 999px;
    border: 3px solid transparent;
    background-clip: content-box;
}
.metrics-panel::-webkit-scrollbar-thumb:hover { background: rgba(102, 126, 234, 0.55); background-clip: content-box; }

.metrics-section {
    margin-bottom: 18px;
    padding: 20px;
    background: var(--surface-1);
    border-radius: var(--r-lg);
    border: 1px solid var(--border);
    transition: border-color var(--t);
}
.metrics-section:hover { border-color: var(--border-strong); }

.metrics-title {
    font-size: 11px;
    text-transform: uppercase;
    color: var(--text-3);
    margin-bottom: 14px;
    letter-spacing: 1.6px;
    font-weight: 600;
}

.metric-item {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 12px;
    margin: 11px 0;
    font-size: 14px;
}

.metric-label { color: var(--text-2); }

.metric-value {
    font-weight: 600;
    color: var(--text);
    font-variant-numeric: tabular-nums;
    font-feature-settings: 'tnum';
}

.metric-bar {
    margin: 8px 0 4px;
    height: 6px;
    background: rgba(255, 255, 255, 0.07);
    border-radius: 999px;
    overflow: hidden;
}

.metric-bar-fill {
    height: 100%;
    width: 0;
    background: var(--grad);
    border-radius: 999px;
    transition: width var(--t-slow);
}

/* ============================================================
   Time selector
   ============================================================ */
.time-selector {
    margin-bottom: 18px;
    padding: 20px;
    background: var(--accent-soft);
    border: 1px solid var(--accent-line);
    border-radius: var(--r-lg);
}

.time-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.time-btn {
    padding: 10px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    color: var(--text-2);
    border-radius: var(--r-sm);
    cursor: pointer;
    transition: all var(--t);
    font-size: 13px;
    font-weight: 500;
}

.time-btn:hover { background: var(--surface-3); color: #fff; }

.time-btn.active {
    background: rgba(102, 126, 234, 0.28);
    border-color: var(--accent-a);
    color: #fff;
    box-shadow: inset 0 0 0 1px rgba(102, 126, 234, 0.3);
}

.period-info { margin-top: 10px; font-size: 12px; color: var(--text-3); }

.year-comparison {
    margin-bottom: 18px;
    padding: 20px;
    background: var(--surface-1);
    border: 1px solid var(--border);
    border-radius: var(--r-lg);
}

/* ============================================================
   AI insights
   ============================================================ */
.ai-insights {
    margin-top: 18px;
    padding: 20px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.12) 0%, rgba(118, 75, 162, 0.12) 100%);
    border: 1px solid var(--accent-line);
    border-radius: var(--r-lg);
}

.ai-insights-title {
    font-family: var(--font-display);
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 9px;
}

.ai-icon {
    width: 18px;
    height: 18px;
    background: var(--grad);
    border-radius: 50%;
    display: inline-block;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.18);
    animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.18); }
    50%      { box-shadow: 0 0 0 6px rgba(102, 126, 234, 0.06); }
}

#ai-settings-btn {
    margin-left: auto;
    background: none;
    border: none;
    color: var(--accent);
    cursor: pointer;
    font-size: 14px;
    padding: 4px;
    border-radius: 6px;
    transition: background var(--t), transform var(--t);
}
#ai-settings-btn:hover { background: var(--surface-2); transform: rotate(35deg); }

#api-key-section {
    margin-bottom: 15px;
    padding: 12px;
    background: rgba(0, 0, 0, 0.35);
    border: 1px solid var(--border);
    border-radius: var(--r-sm);
}

#api-key-input {
    width: 100%;
    padding: 9px 10px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--r-sm);
    color: #fff;
    font-size: 12px;
    margin-bottom: 8px;
    transition: border-color var(--t);
}
#api-key-input:focus { border-color: var(--accent-a); outline: none; }

#api-key-section button {
    transition: filter var(--t), transform var(--t);
}
#api-key-section button:hover { filter: brightness(1.12); transform: translateY(-1px); }

.ai-insight-text {
    font-size: 13px;
    line-height: 1.7;
    color: var(--text-2);
    margin-bottom: 10px;
}

.ai-warning {
    padding: 11px;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.22);
    border-radius: var(--r-sm);
    margin-top: 10px;
    font-size: 13px;
    color: var(--danger);
}

.ai-suggestion {
    padding: 11px;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.22);
    border-radius: var(--r-sm);
    margin-top: 10px;
    font-size: 13px;
    color: var(--success);
}

/* ============================================================
   Explanation section
   ============================================================ */
.explanation-section {
    margin-top: 18px;
    padding: 20px;
    background: var(--surface-1);
    border-radius: var(--r-lg);
    border: 1px solid var(--border);
}

.explanation-toggle {
    width: 100%;
    padding: 12px;
    background: transparent;
    border: 1px solid var(--accent-line);
    color: var(--accent);
    border-radius: var(--r-sm);
    cursor: pointer;
    transition: all var(--t);
    font-size: 14px;
    font-weight: 500;
}

.explanation-toggle:hover { background: var(--accent-soft); border-color: var(--accent-a); }

.metric-explanations {
    margin-top: 18px;
    padding: 16px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--r-sm);
    font-size: 13px;
    line-height: 1.8;
}

.explanation-item {
    margin-bottom: 14px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border);
}
.explanation-item:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }

.explanation-term { font-weight: 600; color: var(--accent); margin-bottom: 5px; }
.explanation-text { color: var(--text-2); }

/* ============================================================
   Hover tooltip
   ============================================================ */
#hover-info {
    position: fixed;
    background: rgba(10, 10, 16, 0.96);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--border-strong);
    border-radius: var(--r-sm);
    padding: 12px 14px;
    pointer-events: none;
    z-index: 200;
    max-width: 300px;
    box-shadow: var(--shadow);
    animation: tipIn 120ms var(--ease);
}

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

.hover-title { font-weight: 600; margin-bottom: 5px; color: #fff; font-size: 14px; }
.hover-details { font-size: 12px; color: var(--text-2); line-height: 1.5; }

/* ============================================================
   Loading
   ============================================================ */
.loading {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-3);
    font-size: 14px;
    padding: 18px;
    justify-content: center;
}

.loading-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--surface-3);
    border-top-color: var(--accent-a);
    border-radius: 50%;
    animation: spin 0.9s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ============================================================
   Abstract-art controls (built at runtime by main.js)
   ============================================================ */
#abstract-controls-wrapper {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}
#abstract-type-select {
    padding: 9px 12px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: var(--r-sm);
    font-size: 13px;
    cursor: pointer;
}
#abstract-type-select:focus { border-color: var(--accent-a); outline: none; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1024px) {
    :root { --panel-w: 340px; }
    .nav { padding: 0 20px; }
}

@media (max-width: 768px) {
    .main-content {
        flex-direction: column;
        height: auto;
    }

    .visualization-container {
        height: 56vh;
        min-height: 340px;
    }

    .metrics-panel {
        width: 100%;
        max-height: none;
        border-left: none;
        border-top: 1px solid var(--border);
    }

    .nav {
        flex-wrap: wrap;
        height: auto;
        padding: 12px 16px;
        gap: 10px;
    }
    :root { --nav-h: 120px; }

    .nav-title { font-size: 18px; width: 100%; text-align: center; }
    .view-tabs, .nav-actions { flex: 1 1 100%; }

    .tab-btn { padding: 8px 14px; font-size: 12.5px; }
    .action-btn { padding: 8px 12px; font-size: 12px; }
}

@media (max-width: 420px) {
    .upload-container { padding: 24px 8px; }
    .upload-box { padding: 40px 22px; }
    .time-buttons { grid-template-columns: 1fr; }
}

/* ============================================================
   Motion preferences
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
        scroll-behavior: auto !important;
    }
}