:root {
    --bg-color: #323437;
    --main-color: #e2b714;
    --accent-color: #CCFF00;
    --caret-color: #e2b714;
    --sub-color: #646669;
    --text-color: #d1d0c5;
    --error-color: #da3333;
    --correct-color: #91d18b;
    --active-bg: rgba(100, 102, 105, 0.15);
    --font-family: 'JetBrains Mono', 'Consolas', monospace;

    /* Glassmorphism Presets */
    --box-bg: rgba(44, 46, 49, 0.6);
    --box-border: rgba(100, 102, 105, 0.2);
    --box-blur: blur(8px);

    /* Typography Scaling */
    --fs-s: 1.1rem;
    --fs-m: 1.35rem;
    --fs-l: 1.7rem;
    --active-fs: var(--fs-m);
    --f: 1; /* Phase 7.9: Discrete Scale Factor */
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: #000; /* Deep black background for desktop isolation */
    color: var(--text-color);
    font-family: var(--font-family);
    margin: 0;
    padding: 0;
    height: 100vh;
    width: 100vw;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    user-select: none;
}

#app-shell {
    width: 100%;
    max-width: 600px;
    min-width: 360px;
    height: 100vh;
    background-color: var(--bg-color);
    display: flex;
    flex-direction: column;
    padding: 20px;
    gap: 16px;
    box-shadow: 0 0 100px rgba(0, 0, 0, 0.5);
    position: relative;
    overflow: hidden;
}

/* TIER 1: HEADER BOX */
.header-box {
    flex-shrink: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 24px;
    background: var(--box-bg);
    border: 1px solid var(--box-border);
    backdrop-filter: var(--box-blur);
    border-radius: 12px;
}

.branding {
    font-size: 0.9rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    color: var(--sub-color);
}

.timer-capsule {
    background: var(--bg-color);
    padding: 4px 16px;
    border-radius: 20px;
    border: 1px solid var(--box-border);
    font-weight: bold;
    color: var(--accent-color);
    font-size: 1.2rem;
    font-variant-numeric: tabular-nums;
    min-width: 60px;
    text-align: center;
    display: flex;
    align-items: center;
    gap: 8px;
}

.timer-label {
    font-size: 0.65rem;
    color: var(--sub-color);
    font-weight: 800;
    letter-spacing: 0.1em;
}

/* TIER 2: ACTION BOX (Immersive Zone) */
.action-box {
    flex: 1;
    background: rgba(30, 30, 30, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: var(--box-blur);
    border-radius: 12px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    overflow: hidden;
    min-height: 0; /* Allow flex shrinking */
}

#source-container {
    flex: 1;
    overflow: hidden;
    position: relative;
    display: flex;
    align-items: center; /* Center words vertically in elastic space */
    justify-content: center;
}

#source-words {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.8em;
    font-size: var(--active-fs);
    line-height: 1.5;
    transition: transform 0.3s ease;
    max-height: 100%;
}

.word-ref {
    color: var(--sub-color);
    padding: 0 4px;
    border-radius: 4px;
    white-space: nowrap;
}
.word-ref.active { color: var(--text-color); background: var(--active-bg); }
.word-ref.finished { opacity: 0.35; }
.word-ref.error { border-bottom: 2px solid var(--error-color); }
.char-ref.correct { color: var(--correct-color); }
.char-ref.incorrect { color: var(--error-color); }

#typing-input {
    height: 60px; /* Locked functional height */
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    padding: 0 12px;
    margin-top: 16px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: text;
}

#typing-input:focus {
    outline: none;
    border-color: rgba(204, 255, 0, 0.4);
    box-shadow: 0 0 15px rgba(204, 255, 0, 0.25);
    background: rgba(0, 0, 0, 0.3);
}

#typing-field {
    font-size: calc(var(--active-fs) * 1.5);
    display: flex;
    align-items: center;
    gap: 0;
    position: relative;
}

#caret {
    position: absolute;
    width: 2px;
    height: 1.4em;
    background: var(--caret-color);
    left: 0;
    transition: transform 0.1s ease-out;
    animation: blink 1s infinite;
    z-index: 10;
}
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }

/* MASTER RESULT MODAL */
#results-overlay {
    position: fixed;
    inset: 0;
    background: rgba(18, 18, 18, 0.95);
    z-index: 9999;
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    animation: overlayFade 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    padding: calc(20px * var(--f));
}
@keyframes overlayFade { from { opacity: 0; transform: scale(0.95); } to { opacity: 1; transform: scale(1); } }

.result-modal {
    background: #1e1f21;
    border: 1px solid var(--box-border);
    box-shadow: 0 0 40px rgba(0, 0, 0, 0.4);
    border-radius: 12px;
    width: 95%;
    max-width: 500px; /* Slightly wider to accommodate 5 cards comfortably */
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 10000;
}

.metric-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
    width: 100%;
}

.label-stack {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: calc(28px * var(--f));
    margin-bottom: calc(1px * var(--f));
    overflow: hidden;
}

.abbr {
    font-size: 0.8rem;
    font-weight: 900;
    color: var(--text-color);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    line-height: 1;
}

.desc {
    font-size: clamp(0.45rem, 0.5rem * var(--f), 0.65rem); /* Boosted legibility */
    color: var(--sub-color);
    text-transform: uppercase;
    letter-spacing: 0.02em;
    line-height: 1.1;
    text-wrap: balance;
    white-space: normal;
    text-align: center;
    opacity: 0.8;
}

.metric-card {
    background: rgba(255, 255, 255, 0.03);
    padding: calc(6px * var(--f)) calc(8px * var(--f));
    border-radius: 6px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    border: calc(1px * var(--f)) solid rgba(255, 255, 255, 0.1);
    min-width: 0;
    min-height: calc(68px * var(--f)); /* Extreme density */
    box-sizing: border-box;
}

.metric-value {
    font-size: 1.6rem; /* Boosted focal point */
    font-weight: 900;
    color: var(--text-color);
    line-height: 1;
}

.metric-value.highlight {
    color: var(--accent-color);
    font-size: 2.0rem; /* Aggressive prominence */
    line-height: 1;
}

.metric-card.primary {
    border-color: rgba(204, 255, 0, 0.2);
    background: rgba(204, 255, 0, 0.03);
}

/* CONFACT ROW - Triple Anchor Symmetry */
.confact-row {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    width: 100%;
    padding: 8px 12px;
    background: rgba(0, 0, 0, 0.15);
    border-radius: 8px;
    border: 1px solid var(--box-border);
}

.confact-item {
    font-size: 0.7rem;
    color: var(--sub-color);
    font-weight: bold;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.confact-item.left { text-align: left; }
.confact-item.center { 
    text-align: center;
    color: var(--text-color);
    font-family: var(--font-family);
    letter-spacing: 0.1em;
}
.confact-item.right { text-align: right; }

.confact-item span {
    color: var(--text-color);
}

/* KEYBOARD HEATMAP SHELL */
#keyboard-heatmap-shell {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 16px;
    background: rgba(0, 0, 0, 0.25);
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    width: 100%; /* Align to grid edges */
}

.kb-row {
    display: flex;
    gap: 4px;
    height: 12px;
}

.key {
    background: rgba(255, 255, 255, 0.08);
    border-radius: 3px;
    flex: 1;
    transition: background-color 0.6s cubic-bezier(0.16, 1, 0.3, 1), 
                box-shadow 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    border: 1px solid rgba(255, 255, 255, 0.02);
    position: relative;
    overflow: hidden;
}

.key::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, transparent 50%);
    pointer-events: none;
}

.key.double { flex: 2; }
.key.onehalf { flex: 1.5; }
.key.shift { flex: 2.2; }
.key.space { flex: 6; }

/* ACTION FOOTER - Symmetrical Triple Alignment */
.modal-footer {
    display: flex;
    flex-direction: column;
    width: 100%;
}

.modal-actions-tier-1 {
    display: grid;
    grid-template-columns: 1fr 1.2fr 1fr; /* Central emphasis */
    gap: 12px;
    width: 100%;
}

.modal-footer button {
    width: 100%;
    padding: 12px 8px;
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.7rem;
    font-weight: 800;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    background: rgba(255, 255, 255, 0.03);
    color: var(--sub-color);
}

.modal-footer button:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-color);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.modal-footer button:active {
    transform: translateY(0) scale(0.98);
}

.modal-footer .btn-hero {
    background: var(--main-color) !important;
    color: var(--bg-color) !important;
    border-color: transparent !important;
    box-shadow: 0 4px 12px rgba(226, 183, 20, 0.2);
}

.modal-footer .btn-hero:hover {
    background: var(--accent-color) !important;
    color: var(--bg-color) !important;
    box-shadow: 0 6px 16px rgba(204, 255, 0, 0.3);
}

.modal-footer .btn-secondary {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--box-border);
}

.modal-actions button {
    flex: 1;
    min-height: 38px;
    border-radius: 6px;
    font-weight: 800;
    font-size: 0.65rem;
    letter-spacing: 0.05em;
    padding: calc(10px * var(--f));
    border: calc(1px * var(--f)) solid var(--box-border);
}

/* TIER 3: CONFIG CONTAINER */
.config-container {
    flex-shrink: 0;
    background: var(--box-bg);
    border: 1px solid var(--box-border);
    backdrop-filter: var(--box-blur);
    border-radius: 12px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.config-header {
    font-size: 0.65rem;
    font-weight: 900;
    color: var(--sub-color);
    text-align: center;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-bottom: -4px;
    opacity: 0.8;
}

.five-module-bar {
    display: flex;
    justify-content: space-between;
    align-items: stretch;
    gap: 8px;
}

.module {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: calc(10px * var(--f));
    background: rgba(0, 0, 0, 0.15);
    border: calc(1px * var(--f)) solid var(--box-border);
    border-radius: 8px;
    min-width: 0;
}

.module.dimmed {
    filter: grayscale(1);
    pointer-events: none;
    opacity: 0.3;
}

.control-label {
    font-size: 0.6rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #888;
    font-weight: bold;
    text-align: center;
    width: 100%;
}

/* QUADRANT ELEMENTS */
.btn-full {
    position: relative; /* Anchor for Status LED */
    width: 100%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--box-border);
    border-radius: 6px;
    padding: 6px 0;
    color: var(--sub-color);
    font-family: inherit;
    font-size: 0.7rem;
    font-weight: 800;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}

.btn-full:hover {
    border-color: var(--main-color);
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-color);
}

.btn-full.active {
    background: var(--accent-color);
    color: #1a1a1a;
    border-color: var(--accent-color);
}

#customToggle {
    position: relative !important;
}

#customToggle.active {
    background: rgba(255, 255, 255, 0.08) !important;
    color: var(--text-color);
    border-color: var(--box-border);
    box-shadow: none !important; /* Global Sanitization */
}

.status-led {
    position: absolute;
    top: calc(4px * var(--f));
    right: calc(4px * var(--f));
    width: calc(5px * var(--f));
    height: calc(5px * var(--f));
    border-radius: 50%;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.3); /* Dim State */
    z-index: 10;
    pointer-events: none;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

#customToggle.active .status-led {
    background-color: #CCFF00 !important; /* Electric Lime */
    border-color: #CCFF00;
    box-shadow: 0 0 4px #CCFF00; /* Sharp Technical Glow */
}

.btn-full.highlight {
    background: rgba(204, 255, 0, 0.1);
    border-color: rgba(204, 255, 0, 0.3);
}

.select-full {
    width: 100%;
    min-width: unset;
}

/* CUSTOM SELECT OVERHAUL */
select {
    appearance: none;
    background: rgba(0, 0, 0, 0.2);
    color: var(--text-color);
    border: 1px solid var(--box-border);
    border-radius: 6px;
    padding: 6px 10px !important;
    font-family: inherit;
    font-size: 0.75rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}

select:hover { border-color: var(--main-color); background: rgba(0, 0, 0, 0.4); }
select:focus { outline: none; border-color: var(--main-color); }

/* SCALE CONTROL - DEPRECATED RANGE STYLES REMOVED */

/* CONFIG DRAWER (Custom Text) */
.config-drawer {
    max-height: 0;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    opacity: 0;
}

.config-drawer.open {
    max-height: 200px;
    opacity: 1;
    padding-bottom: 8px;
}

.drawer-title {
    margin-bottom: 6px;
    display: block;
    font-size: 0.55rem;
    color: var(--accent-color);
}

.drawer-actions {
    display: flex;
    gap: 8px;
    margin-top: 8px;
}

.drawer-actions .btn-full {
    padding: calc(6px * var(--f));
    border-width: calc(1px * var(--f));
}

#customInput {
    width: 100%;
    height: 100px;
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--box-border);
    border-radius: 8px;
    padding: 12px;
    color: var(--text-color);
    font-family: var(--font-family);
    font-size: 0.8rem;
    resize: none;
    transition: border-color 0.3s;
}

#customInput:focus {
    outline: none;
    border-color: var(--accent-color);
}

.keycap {
    background: var(--sub-color);
    color: var(--bg-color);
    padding: 1px 4px;
    border-radius: 3px;
    font-size: 0.6rem;
    opacity: 1;
    transition: opacity 0.2s ease;
}