/* ==========================================================
   ENGLISH QUEST - Present Perfect
   ========================================================== */

:root {
    --font-display: 'Baloo 2', 'Nunito', system-ui, sans-serif;
    --font-main: 'Nunito', system-ui, sans-serif;

    --bg: #070914;
    --panel: rgba(15, 23, 42, 0.78);
    --panel-2: rgba(255, 255, 255, 0.06);
    --border: rgba(255, 255, 255, 0.13);

    --pink: #ff007f;
    --blue: #00f0ff;
    --yellow: #ffd700;
    --green: #3ddc84;
    --red: #ff4d6d;
    --purple: #9d4edd;

    --text: #ffffff;
    --muted: #94a3b8;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
    padding: 18px;
    font-weight: 600;
}

.bg-aurora {
    position: fixed;
    inset: 0;
    z-index: -1;
    background:
        radial-gradient(circle at 15% 15%, rgba(157, 78, 221, 0.25), transparent 42%),
        radial-gradient(circle at 85% 20%, rgba(0, 240, 255, 0.18), transparent 42%),
        radial-gradient(circle at 50% 95%, rgba(255, 0, 127, 0.18), transparent 45%),
        linear-gradient(135deg, #050714 0%, #101428 100%);
    background-size: 180% 180%;
    animation: auroraMove 18s ease infinite alternate;
}

@keyframes auroraMove {
    0% { background-position: 0% 50%; }
    100% { background-position: 100% 50%; }
}

.app {
    width: 100%;
    max-width: 1080px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 22px;
}

/* ================= TOP BAR ================= */
.unified-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    background: var(--panel);
    border-bottom: 1px solid var(--border);
    padding: 14px 20px;
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    position: sticky;
    top: 0;
    z-index: 99;
}

.unified-nav .btn-home {
    background: linear-gradient(135deg, #00f0ff, #0072ff);
    border-color: #00f0ff;
    color: #050515;
    box-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
}

.unified-nav .btn-home:hover {
    box-shadow: 0 0 15px rgba(0, 240, 255, 0.5);
    color: #ffffff;
}

.brand {
    display: flex;
    align-items: center;
    gap: 14px;
}

.brand-icon {
    font-size: 2.4rem;
    filter: drop-shadow(0 4px 14px rgba(255, 215, 0, 0.55));
}

.brand-title {
    font-family: var(--font-display);
    font-size: 1.7rem;
    font-weight: 800;
    letter-spacing: 1px;
    background: linear-gradient(135deg, #ffd700, #ff007f, #00f0ff);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-sub {
    font-size: 0.85rem;
    color: var(--muted);
    font-weight: 700;
}

.nav-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.btn {
    font-family: var(--font-main);
    font-weight: 800;
    font-size: 0.92rem;
    color: var(--text);
    background: var(--panel-2);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 10px 16px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    transition: all 0.2s ease;
}

.btn:hover {
    background: rgba(255, 255, 255, 0.14);
    transform: translateY(-2px);
}

.btn-primary {
    background: linear-gradient(135deg, #ff007f, #9d4edd);
    border-color: transparent;
    box-shadow: 0 6px 18px rgba(157, 78, 221, 0.45);
}

.btn-yellow {
    background: linear-gradient(135deg, #ffd700, #ff9900);
    border-color: transparent;
    color: #241a00;
    box-shadow: 0 6px 18px rgba(255, 215, 0, 0.4);
}

/* ================= SCREENS ================= */
.screen {
    display: none;
    flex-direction: column;
    gap: 20px;
    animation: fadeUp 0.35s ease;
}

.screen.active {
    display: flex;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(14px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ================= MAP SCREEN ================= */
.hero {
    text-align: center;
    padding: 8px 0 0;
}

.hero-badge {
    display: inline-block;
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 0.9rem;
    letter-spacing: 1px;
    padding: 6px 18px;
    border-radius: 20px;
    background: rgba(0, 240, 255, 0.14);
    color: var(--blue);
    border: 1px solid rgba(0, 240, 255, 0.35);
    margin-bottom: 14px;
}

.hero-title {
    font-family: var(--font-display);
    font-size: 2.7rem;
    font-weight: 800;
    line-height: 1.15;
    background: linear-gradient(135deg, #ffffff, #b9c5ff);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-sub {
    color: var(--muted);
    font-size: 1.05rem;
    max-width: 700px;
    margin: 12px auto 0;
    line-height: 1.6;
}

.stat-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
}

.stat-chip {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 14px 16px;
}

.stat-ic { font-size: 1.7rem; }

.stat-chip b {
    font-family: var(--font-display);
    font-size: 1.5rem;
    display: block;
    line-height: 1.1;
}

.stat-chip small {
    color: var(--muted);
    font-size: 0.78rem;
    font-weight: 700;
}

.stat-xp b { color: var(--blue); }
.stat-star b { color: var(--yellow); }
.stat-fire b { color: #ff8c42; }
.stat-done b { color: var(--green); }

.section-label {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 800;
    color: #cbd5e1;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* ---- Thanh "Học tiếp" ---- */
.resume-bar {
    display: none;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    flex-wrap: wrap;
    background: linear-gradient(135deg, rgba(61, 220, 132, 0.18), rgba(0, 240, 255, 0.12));
    border: 1px solid rgba(61, 220, 132, 0.5);
    border-radius: 22px;
    padding: 16px 20px;
    animation: fadeUp 0.35s ease;
}

.resume-bar.show { display: flex; }

.rs-info { display: flex; align-items: center; gap: 14px; min-width: 0; }

.rs-icon {
    font-size: 1.9rem;
    animation: floaty 3s ease-in-out infinite;
}

.rs-info b {
    font-family: var(--font-display);
    font-size: 1.25rem;
    display: block;
    line-height: 1.25;
}

.rs-info small { color: #cbd5e1; font-size: 0.9rem; font-weight: 700; }

.rs-actions { display: flex; align-items: center; gap: 8px; }

.rs-go {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 800;
    letter-spacing: 0.5px;
    padding: 13px 28px;
    border-radius: 16px;
    border: none;
    cursor: pointer;
    color: #04121a;
    background: linear-gradient(135deg, #3ddc84, #00f0ff);
    box-shadow: 0 6px 20px rgba(61, 220, 132, 0.45);
    transition: transform 0.18s ease;
}

.rs-go:hover { transform: translateY(-2px) scale(1.03); }

.rs-drop {
    width: 42px;
    height: 42px;
    border-radius: 14px;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.08);
    color: var(--muted);
    font-size: 1rem;
    font-weight: 800;
    cursor: pointer;
}

.rs-drop:hover { background: rgba(255, 77, 109, 0.28); color: #fff; }

/* ---- Danh sách các chặng ---- */
.station-grid {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.station-row {
    position: relative;
    width: 100%;
    text-align: left;
    background: var(--panel);
    border: 1px solid var(--border);
    border-left: 5px solid var(--st-color, var(--blue));
    border-radius: 18px;
    padding: 16px 20px;
    cursor: pointer;
    color: var(--text);
    font-family: var(--font-main);
    display: flex;
    align-items: center;
    gap: 16px;
    transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.station-row:hover {
    transform: translateX(6px);
    background: rgba(255, 255, 255, 0.09);
    box-shadow: 0 8px 26px rgba(0, 0, 0, 0.4);
}

.station-row.doing {
    background: linear-gradient(90deg, rgba(61, 220, 132, 0.16), var(--panel) 60%);
    border-color: rgba(61, 220, 132, 0.45);
}

.station-row.mastered .st-title { color: var(--yellow); }

.st-index {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 800;
    color: var(--st-color, var(--blue));
    width: 24px;
    flex-shrink: 0;
    text-align: center;
}

.st-icon {
    font-size: 1.9rem;
    width: 50px;
    height: 50px;
    display: grid;
    place-items: center;
    border-radius: 15px;
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid var(--border);
    flex-shrink: 0;
}

.st-body {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.st-head {
    display: flex;
    align-items: center;
    gap: 9px;
    flex-wrap: wrap;
}

.st-title {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 800;
    line-height: 1.2;
}

.st-flag {
    font-size: 0.68rem;
    font-weight: 800;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    padding: 3px 9px;
    border-radius: 9px;
    background: rgba(61, 220, 132, 0.22);
    color: var(--green);
    border: 1px solid rgba(61, 220, 132, 0.45);
}

.st-flag.done {
    background: rgba(255, 215, 0, 0.18);
    color: var(--yellow);
    border-color: rgba(255, 215, 0, 0.45);
}

.st-desc {
    color: #94a3b8;
    font-size: 0.9rem;
    line-height: 1.45;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.st-meta {
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    color: var(--st-color, var(--blue));
    opacity: 0.85;
}

.st-right {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-shrink: 0;
}

.st-stars { font-size: 1.05rem; letter-spacing: 2px; white-space: nowrap; }
.st-stars .on { filter: none; }
.st-stars .off { filter: grayscale(1); opacity: 0.3; }

.st-go {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 0.85rem;
    padding: 9px 18px;
    border-radius: 13px;
    background: var(--st-color, var(--blue));
    color: #050714;
    white-space: nowrap;
}

.page-foot {
    text-align: center;
    color: #64748b;
    font-size: 0.92rem;
    padding: 6px 0 20px;
}

/* ================= PLAY SCREEN ================= */
.playbar {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 12px 16px;
    flex-wrap: wrap;
}

.pb-back {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.07);
    color: var(--text);
    font-size: 1.1rem;
    cursor: pointer;
    flex-shrink: 0;
}

.pb-back:hover { background: rgba(255, 77, 109, 0.25); }

.progress-track {
    flex: 1;
    min-width: 120px;
    height: 16px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.09);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    border-radius: 10px;
    background: linear-gradient(90deg, #3ddc84, #00f0ff);
    box-shadow: 0 0 16px rgba(61, 220, 132, 0.6);
    transition: width 0.4s ease;
}

.hearts { display: flex; gap: 3px; font-size: 1.2rem; }
.hearts .lost { filter: grayscale(1); opacity: 0.3; }

.xp-chip, .combo-chip {
    font-family: var(--font-display);
    font-weight: 800;
    padding: 7px 14px;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border);
    white-space: nowrap;
}

.combo-chip { opacity: 0.35; transition: all 0.25s ease; }
.combo-chip.hot {
    opacity: 1;
    background: rgba(255, 140, 66, 0.22);
    border-color: #ff8c42;
    color: #ffb37a;
    transform: scale(1.06);
}

.play-head {
    display: flex;
    align-items: center;
    gap: 14px;
}

.play-icon {
    font-size: 2rem;
    width: 54px;
    height: 54px;
    display: grid;
    place-items: center;
    border-radius: 16px;
    background: var(--panel-2);
    border: 1px solid var(--border);
}

.play-head h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 800;
}

.play-count { color: var(--muted); font-size: 0.9rem; }

.stage {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 26px;
    padding: 26px;
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    min-height: 300px;
}

.q-prompt {
    font-family: var(--font-display);
    font-size: 1.45rem;
    font-weight: 700;
    line-height: 1.45;
    text-align: center;
    margin-bottom: 18px;
}

.q-hint {
    text-align: center;
    color: var(--muted);
    font-size: 0.95rem;
    margin-bottom: 18px;
}

.q-prompt .blank {
    display: inline-block;
    min-width: 92px;
    border-bottom: 3px dashed var(--yellow);
    color: var(--yellow);
}

.q-prompt .cue {
    color: var(--blue);
    font-size: 0.95em;
}

/* Picture frame */
.pic-frame {
    width: 100%;
    max-width: 340px;
    margin: 0 auto 20px;
    aspect-ratio: 16 / 9;
    display: grid;
    place-items: center;
    border-radius: 24px;
    background:
        radial-gradient(circle at 30% 25%, rgba(255, 255, 255, 0.14), transparent 55%),
        linear-gradient(135deg, rgba(157, 78, 221, 0.35), rgba(0, 240, 255, 0.25));
    border: 1px solid var(--border);
    box-shadow: inset 0 0 40px rgba(0, 0, 0, 0.35);
    position: relative;
    overflow: hidden;
}

.pic-frame::before {
    content: '';
    position: absolute;
    inset: -40%;
    background: conic-gradient(from 0deg, transparent, rgba(255, 255, 255, 0.09), transparent 40%);
    animation: spinShine 9s linear infinite;
}

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

.pic-emoji {
    font-size: 5.2rem;
    position: relative;
    animation: floaty 3.4s ease-in-out infinite;
    filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.5));
}

@keyframes floaty {
    0%, 100% { transform: translateY(0) rotate(-2deg); }
    50% { transform: translateY(-10px) rotate(2deg); }
}

/* Speak button */
.btn-speak {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1rem;
    padding: 12px 22px;
    border-radius: 16px;
    border: none;
    cursor: pointer;
    background: linear-gradient(135deg, #00f0ff, #3ddc84);
    color: #04121a;
    box-shadow: 0 6px 18px rgba(0, 240, 255, 0.4);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: transform 0.15s ease;
}

.btn-speak:hover { transform: scale(1.05); }
.btn-speak.small {
    background: rgba(0, 240, 255, 0.16);
    color: var(--blue);
    border: 1px solid rgba(0, 240, 255, 0.4);
    box-shadow: none;
    padding: 8px 14px;
    font-size: 0.88rem;
}

.speak-row {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 18px;
}

/* ---- Vocabulary card ---- */
.vocab-word {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 800;
    text-align: center;
    line-height: 1.1;
    background: linear-gradient(135deg, #ffd700, #ff7ab8);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.vocab-ipa {
    text-align: center;
    color: var(--blue);
    font-size: 1.05rem;
    margin-top: 2px;
}

.vocab-vi {
    text-align: center;
    font-size: 1.3rem;
    font-weight: 800;
    color: #ffffff;
    margin: 10px 0 18px;
}

.vocab-forms {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 18px;
}

.form-pill {
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 10px 18px;
    text-align: center;
    min-width: 108px;
}

.form-pill small {
    display: block;
    color: var(--muted);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 1px;
}

.form-pill b {
    font-family: var(--font-display);
    font-size: 1.2rem;
}

.form-pill.v3 {
    background: rgba(61, 220, 132, 0.16);
    border-color: rgba(61, 220, 132, 0.5);
}
.form-pill.v3 b { color: var(--green); }

.vocab-example {
    background: rgba(0, 240, 255, 0.08);
    border: 1px solid rgba(0, 240, 255, 0.28);
    border-left: 5px solid var(--blue);
    border-radius: 16px;
    padding: 14px 18px;
    text-align: center;
}

.vocab-example .en {
    font-size: 1.15rem;
    font-weight: 700;
}

.vocab-example .en u {
    text-decoration-color: var(--yellow);
    text-underline-offset: 4px;
    color: var(--yellow);
}

.vocab-example .vi {
    color: var(--muted);
    font-size: 0.95rem;
    margin-top: 6px;
}

/* ---- Options (multiple choice) ---- */
.opts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 12px;
}

.opt {
    font-family: var(--font-main);
    font-weight: 700;
    font-size: 1.08rem;
    text-align: left;
    color: var(--text);
    background: rgba(255, 255, 255, 0.06);
    border: 2px solid var(--border);
    border-radius: 18px;
    padding: 16px 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: all 0.18s ease;
}

.opt:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.12);
    transform: translateY(-2px);
}

.opt .key {
    width: 30px;
    height: 30px;
    flex-shrink: 0;
    display: grid;
    place-items: center;
    border-radius: 9px;
    background: rgba(255, 255, 255, 0.1);
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 0.9rem;
}

.opt.selected {
    border-color: var(--blue);
    background: rgba(0, 240, 255, 0.14);
}

.opt.correct {
    border-color: var(--green);
    background: rgba(61, 220, 132, 0.2);
}

.opt.wrong {
    border-color: var(--red);
    background: rgba(255, 77, 109, 0.18);
}

.opt:disabled { cursor: default; }

/* ---- Matching ---- */
.match-board {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.match-col {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.match-col h5 {
    font-family: var(--font-display);
    font-size: 0.85rem;
    letter-spacing: 1px;
    color: var(--muted);
    text-transform: uppercase;
    text-align: center;
    margin-bottom: 2px;
}

.m-item {
    font-family: var(--font-main);
    font-weight: 700;
    font-size: 1.02rem;
    color: var(--text);
    background: rgba(255, 255, 255, 0.06);
    border: 2px solid var(--border);
    border-radius: 16px;
    padding: 14px 14px;
    cursor: pointer;
    text-align: center;
    transition: all 0.18s ease;
}

.m-item:hover:not(:disabled) { background: rgba(255, 255, 255, 0.13); }

.m-item.sel {
    border-color: var(--yellow);
    background: rgba(255, 215, 0, 0.18);
    transform: scale(1.03);
}

.m-item.done {
    border-color: var(--green);
    background: rgba(61, 220, 132, 0.16);
    opacity: 0.55;
    cursor: default;
}

.m-item.shake { animation: shake 0.35s ease; }

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-8px); }
    75% { transform: translateX(8px); }
}

/* ---- Sentence builder ---- */
.build-tray {
    min-height: 76px;
    border-radius: 18px;
    border: 2px dashed rgba(255, 255, 255, 0.25);
    background: rgba(0, 0, 0, 0.22);
    padding: 14px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: flex-start;
    align-content: flex-start;
    margin-bottom: 18px;
}

.build-tray:empty::before {
    content: 'Bấm vào các từ bên dưới để xếp thành câu…';
    color: var(--muted);
    font-size: 0.95rem;
    font-weight: 700;
}

.build-bank {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

.chip {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.14), rgba(255, 255, 255, 0.06));
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 10px 18px;
    cursor: pointer;
    box-shadow: 0 4px 0 rgba(0, 0, 0, 0.35);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.chip:hover:not(:disabled) { transform: translateY(-2px); }
.chip:active { transform: translateY(2px); box-shadow: 0 1px 0 rgba(0, 0, 0, 0.35); }
.chip.used { visibility: hidden; }
.chip.ok { border-color: var(--green); background: rgba(61, 220, 132, 0.2); }
.chip.bad { border-color: var(--red); background: rgba(255, 77, 109, 0.2); }

/* ---- Fill in the blank ---- */
.fill-row {
    display: flex;
    justify-content: center;
    margin-bottom: 16px;
}

.fill-input {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
    color: var(--text);
    background: rgba(0, 0, 0, 0.3);
    border: 2px solid var(--border);
    border-bottom: 4px solid var(--yellow);
    border-radius: 16px;
    padding: 14px 20px;
    width: 100%;
    max-width: 420px;
    outline: none;
}

.fill-input::placeholder { color: #5b6478; font-size: 1.1rem; }
.fill-input:focus { border-color: var(--blue); }
.fill-input.ok { border-color: var(--green); background: rgba(61, 220, 132, 0.14); }
.fill-input.bad { border-color: var(--red); background: rgba(255, 77, 109, 0.14); }

.hint-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}

.hint-chips .chip { font-size: 0.98rem; padding: 8px 14px; }

.bank-label {
    text-align: center;
    color: var(--muted);
    font-size: 0.85rem;
    font-weight: 800;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 10px;
}

/* ---- Reading passage ---- */
.passage {
    background: rgba(255, 215, 0, 0.07);
    border: 1px solid rgba(255, 215, 0, 0.28);
    border-radius: 20px;
    padding: 20px 22px;
    margin-bottom: 22px;
    line-height: 1.85;
    font-size: 1.05rem;
    font-weight: 600;
}

.passage h4 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    margin-bottom: 10px;
    color: var(--yellow);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    flex-wrap: wrap;
}

.passage b { color: var(--yellow); }

.passage-pics {
    display: flex;
    justify-content: center;
    gap: 14px;
    font-size: 2.2rem;
    margin-bottom: 12px;
}

/* ================= FEEDBACK ================= */
.feedback {
    display: none;
    border-radius: 20px;
    padding: 16px 20px;
    gap: 14px;
    align-items: flex-start;
    animation: fadeUp 0.25s ease;
}

.feedback.show { display: flex; }

.feedback.ok {
    background: rgba(61, 220, 132, 0.15);
    border: 1px solid rgba(61, 220, 132, 0.45);
}

.feedback.no {
    background: rgba(255, 77, 109, 0.14);
    border: 1px solid rgba(255, 77, 109, 0.45);
}

.fb-ic { font-size: 1.9rem; line-height: 1; }

.fb-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 800;
}

.feedback.ok .fb-title { color: var(--green); }
.feedback.no .fb-title { color: #ff90a6; }

.fb-text {
    color: #e2e8f0;
    font-size: 0.98rem;
    line-height: 1.6;
    margin-top: 3px;
}

.fb-text b { color: var(--yellow); }

/* ================= ACTIONS ================= */
.actions {
    display: flex;
    justify-content: center;
    padding-bottom: 24px;
}

.btn-check {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 800;
    letter-spacing: 1px;
    padding: 16px 46px;
    border-radius: 20px;
    border: none;
    cursor: pointer;
    color: #04121a;
    background: linear-gradient(135deg, #3ddc84, #00f0ff);
    box-shadow: 0 8px 24px rgba(61, 220, 132, 0.4);
    transition: all 0.2s ease;
}

.btn-check:hover { transform: translateY(-3px); box-shadow: 0 12px 30px rgba(61, 220, 132, 0.6); }
.btn-check:disabled { opacity: 0.4; cursor: not-allowed; transform: none; box-shadow: none; }

.btn-check.btn-alt {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text);
    border: 1px solid var(--border);
    box-shadow: none;
}

/* ================= MODALS ================= */
.modal {
    position: fixed;
    inset: 0;
    z-index: 60;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: rgba(3, 5, 14, 0.82);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.modal.open { display: flex; }

.modal-card {
    position: relative;
    width: 100%;
    max-width: 520px;
    max-height: 90vh;
    overflow-y: auto;
    background: linear-gradient(160deg, #131a33, #0a0d1c);
    border: 1px solid var(--border);
    border-radius: 28px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 24px 70px rgba(0, 0, 0, 0.7);
    animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.4);
}

.modal-wide { max-width: 780px; text-align: left; }

@keyframes popIn {
    from { opacity: 0; transform: scale(0.9) translateY(20px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 38px;
    height: 38px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.08);
    color: var(--text);
    font-size: 1.1rem;
    cursor: pointer;
}

.modal-close:hover { background: rgba(255, 77, 109, 0.3); }

.modal-title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: 6px;
}

/* Theory */
.theory-block { margin-top: 22px; }

.theory-block h4 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    color: var(--blue);
    margin-bottom: 12px;
}

.formula-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 12px;
}

.formula {
    border-radius: 18px;
    padding: 14px 16px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
}

.formula b {
    font-family: var(--font-display);
    font-size: 1.15rem;
    display: block;
    margin: 6px 0;
}

.formula em {
    color: var(--muted);
    font-size: 0.92rem;
    font-style: normal;
}

.formula em u { color: var(--yellow); text-underline-offset: 3px; }

.f-tag {
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 1px;
    text-transform: uppercase;
    padding: 3px 10px;
    border-radius: 10px;
}

.formula-pos { border-color: rgba(61, 220, 132, 0.4); }
.formula-pos .f-tag { background: rgba(61, 220, 132, 0.2); color: var(--green); }
.formula-neg { border-color: rgba(255, 77, 109, 0.4); }
.formula-neg .f-tag { background: rgba(255, 77, 109, 0.2); color: #ff90a6; }
.formula-que { border-color: rgba(0, 240, 255, 0.4); }
.formula-que .f-tag { background: rgba(0, 240, 255, 0.18); color: var(--blue); }

.theory-note {
    margin-top: 12px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 14px;
    padding: 12px 16px;
    font-size: 0.96rem;
    line-height: 1.6;
}

.hl-pink { color: var(--pink); }
.hl-blue { color: var(--blue); }
.hl-yellow { color: var(--yellow); }

.theory-list { list-style: none; display: flex; flex-direction: column; gap: 10px; }

.theory-list li {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 14px;
    padding: 11px 15px;
    font-size: 0.97rem;
    line-height: 1.55;
}

.theory-list em { color: var(--yellow); font-style: normal; font-weight: 700; }

.signal-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 9px;
}

.signal {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1rem;
    background: rgba(157, 78, 221, 0.18);
    border: 1px solid rgba(157, 78, 221, 0.45);
    border-radius: 14px;
    padding: 8px 14px;
    text-align: center;
}

.signal small {
    display: block;
    font-family: var(--font-main);
    font-weight: 700;
    font-size: 0.72rem;
    color: var(--muted);
}

.verb-table {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
    gap: 9px;
}

.verb-row {
    display: grid;
    grid-template-columns: 22px 26px 1fr 1fr 1fr 1.1fr;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 13px;
    padding: 9px 12px;
    font-size: 0.92rem;
}

.verb-row .vr-no { color: #64748b; font-size: 0.78rem; font-weight: 800; }
.verb-row .vr-emo { font-size: 1.25rem; }
.verb-row .vr-v1 { font-weight: 800; }
.verb-row .vr-v2 { color: #ffb37a; font-weight: 700; }
.verb-row .vr-v3 { color: var(--green); font-weight: 800; }
.verb-row .vr-vi { color: var(--muted); font-size: 0.83rem; text-align: right; }

.verb-legend {
    display: grid;
    grid-template-columns: 22px 26px 1fr 1fr 1fr 1.1fr;
    gap: 8px;
    padding: 0 12px 8px;
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: #64748b;
}

.verb-legend span:last-child { text-align: right; }

/* Mẹo ghi nhớ trên thẻ từ vựng */
.vocab-tip {
    background: rgba(255, 215, 0, 0.1);
    border: 1px solid rgba(255, 215, 0, 0.32);
    border-radius: 14px;
    padding: 11px 16px;
    text-align: center;
    font-size: 0.95rem;
    line-height: 1.5;
    margin-bottom: 18px;
}

.vocab-tip b { color: var(--yellow); }

/* ---- Bảng chọn giọng đọc ---- */
.modal-mid { max-width: 620px; text-align: left; }
.modal-mid .modal-title, .modal-mid .res-sub { text-align: center; }

.btn-blue {
    background: linear-gradient(135deg, #00f0ff, #3ddc84);
    border-color: transparent;
    color: #04121a;
    box-shadow: 0 6px 18px rgba(0, 240, 255, 0.35);
}

.speed-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 12px 16px;
    margin-bottom: 16px;
}

.speed-label {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 0.95rem;
    color: var(--muted);
}

.speed-btns { display: flex; gap: 8px; flex-wrap: wrap; }

.speed-btn {
    font-family: var(--font-main);
    font-weight: 800;
    font-size: 0.88rem;
    color: var(--text);
    background: rgba(255, 255, 255, 0.07);
    border: 2px solid var(--border);
    border-radius: 12px;
    padding: 8px 14px;
    cursor: pointer;
    transition: all 0.18s ease;
}

.speed-btn:hover { background: rgba(255, 255, 255, 0.14); }

.speed-btn.on {
    border-color: var(--blue);
    background: rgba(0, 240, 255, 0.18);
    color: var(--blue);
}

.voice-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 320px;
    overflow-y: auto;
    margin-bottom: 16px;
    padding-right: 4px;
}

.voice-row {
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid var(--border);
    border-radius: 14px;
    padding: 10px 14px;
    cursor: pointer;
    transition: all 0.18s ease;
}

.voice-row:hover { background: rgba(255, 255, 255, 0.11); }

.voice-row.on {
    border-color: var(--green);
    background: rgba(61, 220, 132, 0.15);
}

.voice-play {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    background: linear-gradient(135deg, #00f0ff, #3ddc84);
    color: #04121a;
    font-size: 0.85rem;
    font-weight: 800;
    display: grid;
    place-items: center;
}

.voice-play:hover { transform: scale(1.1); }

.voice-info { flex: 1; min-width: 0; }
.voice-info b { display: block; font-size: 1rem; }
.voice-info small { color: var(--muted); font-size: 0.78rem; font-weight: 700; }

.voice-q {
    font-size: 0.72rem;
    font-weight: 800;
    padding: 4px 10px;
    border-radius: 10px;
    white-space: nowrap;
}

.q-best { background: rgba(255, 215, 0, 0.2); color: var(--yellow); }
.q-good { background: rgba(0, 240, 255, 0.18); color: var(--blue); }
.q-basic { background: rgba(255, 255, 255, 0.08); color: var(--muted); }

.voice-check { color: var(--green); font-size: 1.1rem; width: 16px; }

.voice-empty {
    color: var(--muted);
    text-align: center;
    padding: 24px 12px;
    line-height: 1.6;
}

.voice-help {
    background: rgba(255, 215, 0, 0.07);
    border: 1px solid rgba(255, 215, 0, 0.28);
    border-radius: 16px;
    padding: 14px 18px;
}

.voice-help summary {
    cursor: pointer;
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1rem;
    color: var(--yellow);
}

.voice-help-body { margin-top: 12px; font-size: 0.92rem; line-height: 1.65; color: #e2e8f0; }
.voice-help-body ol { margin: 6px 0 12px 20px; }
.voice-help-body li { margin-bottom: 5px; }
.voice-help-body b { color: var(--yellow); }

.vh-title {
    font-family: var(--font-display);
    font-weight: 800;
    color: var(--blue);
    margin-top: 10px;
}

.vh-tip {
    margin-top: 10px;
    background: rgba(0, 240, 255, 0.1);
    border-radius: 12px;
    padding: 10px 14px;
}

/* Result modal */
.res-emoji { font-size: 4.5rem; line-height: 1; margin-bottom: 6px; animation: floaty 2.6s ease-in-out infinite; }
.res-sub { color: var(--muted); margin-bottom: 16px; }

.res-stars { font-size: 2.6rem; letter-spacing: 8px; margin-bottom: 18px; }
.res-stars .off { filter: grayscale(1); opacity: 0.3; }
.res-stars .on { animation: starPop 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.6) both; display: inline-block; }
.res-stars .on:nth-child(2) { animation-delay: 0.15s; }
.res-stars .on:nth-child(3) { animation-delay: 0.3s; }

@keyframes starPop {
    from { transform: scale(0) rotate(-90deg); opacity: 0; }
    to { transform: scale(1) rotate(0); opacity: 1; }
}

.res-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 22px;
}

.res-box {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 14px 8px;
}

.res-box b {
    font-family: var(--font-display);
    font-size: 1.5rem;
    display: block;
    color: var(--yellow);
}

.res-box small { color: var(--muted); font-size: 0.75rem; font-weight: 700; }

.res-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.res-actions .btn-check { padding: 14px 26px; font-size: 1.05rem; }

.link-btn {
    margin-top: 14px;
    background: none;
    border: none;
    color: var(--muted);
    font-family: var(--font-main);
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    text-decoration: underline;
}

.link-btn:hover { color: var(--text); }

/* ================= TOAST ================= */
.toast {
    position: fixed;
    bottom: 28px;
    left: 50%;
    transform: translate(-50%, 30px);
    background: rgba(10, 14, 30, 0.95);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 13px 24px;
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1.02rem;
    z-index: 90;
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.6);
}

.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* Floating +XP */
.xp-pop {
    position: fixed;
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1.6rem;
    color: var(--green);
    pointer-events: none;
    z-index: 95;
    animation: xpFly 1s ease-out forwards;
    text-shadow: 0 3px 12px rgba(0, 0, 0, 0.7);
}

@keyframes xpFly {
    0% { opacity: 1; transform: translateY(0) scale(0.7); }
    30% { transform: translateY(-24px) scale(1.15); }
    100% { opacity: 0; transform: translateY(-80px) scale(1); }
}

/* Confetti */
.confetti {
    position: fixed;
    width: 11px;
    height: 15px;
    z-index: 94;
    pointer-events: none;
    animation: confFall 1.5s linear forwards;
}

@keyframes confFall {
    0% { opacity: 1; transform: translateY(0) rotate(0); }
    100% { opacity: 0; transform: translateY(85vh) rotate(720deg); }
}

/* ================= RESPONSIVE ================= */
@media (max-width: 780px) {
    body { padding: 12px; }
    .hero-title { font-size: 1.9rem; }
    .hero-sub { font-size: 0.95rem; }
    .stat-row { grid-template-columns: repeat(2, 1fr); }
    .brand-title { font-size: 1.3rem; }
    .nav-actions .btn span { display: none; }
    .nav-actions .btn { padding: 10px 13px; }
    .stage { padding: 18px 14px; border-radius: 20px; }
    .q-prompt { font-size: 1.2rem; }
    .vocab-word { font-size: 2.2rem; }
    .pic-emoji { font-size: 4rem; }
    .match-board { gap: 9px; }
    .m-item { font-size: 0.92rem; padding: 12px 8px; }

    /* Danh sách chặng gọn lại trên điện thoại */
    .station-row { padding: 13px 14px; gap: 11px; flex-wrap: wrap; }
    .st-index { display: none; }
    .st-icon { width: 42px; height: 42px; font-size: 1.5rem; border-radius: 13px; }
    .st-title { font-size: 1.05rem; }
    .st-desc { -webkit-line-clamp: 2; line-clamp: 2; font-size: 0.85rem; }
    .st-right { width: 100%; justify-content: space-between; padding-left: 53px; }
    .station-row:hover { transform: none; }

    .resume-bar { padding: 14px; }
    .rs-actions { width: 100%; }
    .rs-go { flex: 1; }
    .btn-check { padding: 15px 32px; font-size: 1.05rem; width: 100%; }
    .actions { padding: 0 0 20px; }
    .res-grid { grid-template-columns: 1fr; }
    .modal-card { padding: 22px 18px; }
}