/* ============================================
   TypeFlow — Typing Trainer Styles
   ============================================ */

/* ---- Reset & Custom Properties ---- */

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

[hidden] {
    display: none !important;
}

:root {
    --color-bg: #f1f5f9;
    --color-surface: #ffffff;
    --color-text: #0f172a;
    --color-text-secondary: #64748b;
    --color-text-muted: #94a3b8;
    --color-border: #e2e8f0;
    --color-accent: #2563eb;
    --color-accent-hover: #1d4ed8;
    --color-accent-light: #dbeafe;
    --color-success: #16a34a;
    --color-success-bg: #dcfce7;
    --color-error: #dc2626;
    --color-error-bg: #fee2e2;

    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono",
        "Courier New", monospace;

    --radius: 8px;
    --radius-sm: 4px;
    --radius-lg: 12px;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);

    /* Finger colors — soft pastels */
    --finger-l-pinky: #fce4ec;
    --finger-l-ring: #e3f2fd;
    --finger-l-mid: #e8f5e9;
    --finger-l-index: #fff8e1;
    --finger-r-index: #fff8e1;
    --finger-r-mid: #e8f5e9;
    --finger-r-ring: #e3f2fd;
    --finger-r-pinky: #fce4ec;
    --finger-thumb: #f5f5f5;
}

/* ---- Base ---- */

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ---- Layout ---- */

.app {
    max-width: 920px;
    margin: 0 auto;
    padding: 24px 16px 48px;
}

/* ---- Header ---- */

.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 32px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--color-border);
}

.header__title {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* ---- Mode Switch ---- */

.mode-switch {
    display: flex;
    background: var(--color-bg);
    border-radius: var(--radius);
    padding: 3px;
    border: 1px solid var(--color-border);
}

.mode-switch__btn {
    padding: 6px 16px;
    border: none;
    background: transparent;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all 0.15s ease;
    font-family: var(--font-sans);
}

.mode-switch__btn--active {
    background: var(--color-surface);
    color: var(--color-text);
    box-shadow: var(--shadow-sm);
}

.mode-switch__btn:hover:not(.mode-switch__btn--active) {
    color: var(--color-text);
}

/* ---- Lesson Navigation ---- */

.lesson-nav {
    margin-bottom: 20px;
}

.lesson-nav__select {
    width: 100%;
    padding: 10px 36px 10px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-surface);
    font-size: 0.9375rem;
    font-family: var(--font-sans);
    color: var(--color-text);
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M6 8.825L.35 3.175l.7-.7L6 7.425l4.95-4.95.7.7z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
}

.lesson-nav__select:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: -1px;
    border-color: var(--color-accent);
}

.lesson-nav__desc {
    margin-top: 8px;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

/* ---- Text Selector (Advanced) ---- */

.text-selector {
    margin-bottom: 20px;
}

/* ---- Typing Area ---- */

.typing-area {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    min-height: 100px;
    margin-bottom: 20px;
    cursor: text;
    transition: border-color 0.15s ease;
}

.typing-area:focus {
    outline: none;
    border-color: var(--color-accent);
}

.typing-area__prompt {
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.875rem;
    margin-bottom: 8px;
}

.typing-area__text {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    line-height: 2.2;
    letter-spacing: 0.01em;
}

/* ---- Characters ---- */

.char {
    position: relative;
    border-radius: 2px;
    transition: color 0.08s ease;
}

.char--pending {
    color: var(--color-text-muted);
}

.char--correct {
    color: var(--color-success);
}

.char--incorrect {
    color: var(--color-error);
    background: var(--color-error-bg);
}

.char--current {
    color: var(--color-text);
    border-bottom: 2px solid var(--color-accent);
    animation: cursor-blink 1s step-end infinite;
}

@keyframes cursor-blink {
    50% {
        border-color: transparent;
    }
}

/* ---- Stats Bar ---- */

.stats {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
}

.stats__item {
    flex: 1;
    text-align: center;
    padding: 12px 8px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}

.stats__value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.stats__label {
    display: block;
    font-size: 0.6875rem;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-top: 2px;
}

/* ---- Virtual Keyboard ---- */

.keyboard {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 16px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin-bottom: 12px;
    overflow-x: auto;
}

.keyboard__row {
    display: flex;
    gap: 4px;
}

.key {
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text);
    background: #fafafa;
    user-select: none;
    transition: all 0.1s ease;
    position: relative;
}

.key--special {
    font-size: 0.6875rem;
    color: var(--color-text-secondary);
}

.key--home::after {
    content: "";
    position: absolute;
    bottom: 5px;
    left: 50%;
    transform: translateX(-50%);
    width: 10px;
    height: 2px;
    background: var(--color-text-muted);
    border-radius: 1px;
}

/* Finger color coding */
.key[data-finger="l-pinky"] { background: var(--finger-l-pinky); }
.key[data-finger="l-ring"]  { background: var(--finger-l-ring); }
.key[data-finger="l-mid"]   { background: var(--finger-l-mid); }
.key[data-finger="l-index"] { background: var(--finger-l-index); }
.key[data-finger="r-index"] { background: var(--finger-r-index); }
.key[data-finger="r-mid"]   { background: var(--finger-r-mid); }
.key[data-finger="r-ring"]  { background: var(--finger-r-ring); }
.key[data-finger="r-pinky"] { background: var(--finger-r-pinky); }
.key[data-finger="thumb"]   { background: var(--finger-thumb); }

.key--active {
    background: var(--color-accent) !important;
    color: #fff !important;
    border-color: var(--color-accent-hover);
    box-shadow: 0 0 0 2px var(--color-accent-light);
    transform: scale(1.08);
}

/* ---- Finger Hint ---- */

.finger-hint {
    text-align: center;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: 20px;
    min-height: 1.4em;
}

/* ---- Buttons ---- */

.actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-bottom: 32px;
}

.btn {
    padding: 10px 20px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-surface);
    font-size: 0.875rem;
    font-weight: 500;
    font-family: var(--font-sans);
    color: var(--color-text);
    cursor: pointer;
    transition: all 0.15s ease;
}

.btn:hover {
    background: var(--color-bg);
    border-color: var(--color-text-muted);
}

.btn--primary {
    background: var(--color-accent);
    color: #fff;
    border-color: var(--color-accent);
}

.btn--primary:hover {
    background: var(--color-accent-hover);
}

.btn--sm {
    padding: 6px 14px;
    font-size: 0.8125rem;
}

/* ---- Results Panel ---- */

.results {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
    margin-bottom: 24px;
}

.results__title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 24px;
}

.results__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}

.result-card {
    padding: 16px 8px;
    background: var(--color-bg);
    border-radius: var(--radius);
}

.result-card__value {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.result-card__label {
    display: block;
    font-size: 0.6875rem;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-top: 4px;
}

.results__rating {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 24px;
    padding: 8px 20px;
    border-radius: var(--radius);
    display: inline-block;
}

.rating--bronze {
    color: #92400e;
    background: #fef3c7;
}

.rating--silver {
    color: #1e40af;
    background: #dbeafe;
}

.rating--gold {
    color: #854d0e;
    background: #fef9c3;
}

.results__section {
    text-align: left;
    margin-bottom: 16px;
    padding: 16px;
    background: var(--color-bg);
    border-radius: var(--radius);
}

.results__section-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
}

.results__problem-keys {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.problem-key {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    background: var(--color-error-bg);
    color: var(--color-error);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    font-weight: 500;
}

.problem-key small {
    font-size: 0.75rem;
    opacity: 0.7;
}

.results__tip {
    font-size: 0.9375rem;
    color: var(--color-text);
    line-height: 1.5;
}

.results__actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-top: 24px;
}

/* ---- Responsive ---- */

@media (max-width: 640px) {
    .app {
        padding: 16px 12px 40px;
    }

    .header {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }

    .typing-area {
        padding: 16px;
    }

    .typing-area__text {
        font-size: 1.0625rem;
        line-height: 2;
    }

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

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

    .keyboard {
        padding: 8px;
    }

    .key {
        height: 34px;
        font-size: 0.625rem;
    }
}