/* ================================================================
   IELTS Dictation Practice
   nice-pdf inspired: warm tones, rhythmic spacing, clear hierarchy.
   English font: system sans-serif, optimized for screen reading.
   Input: underline-only minimal style.
   ================================================================ */

:root {
    --cream: #FFF8F0;
    --cream-dark: #F5EDE0;
    --terracotta: #E07A5F;
    --terracotta-light: #F0C4B3;
    --sage: #81B29A;
    --sage-light: #B5D5C4;
    --sage-dark: #5E8F74;
    --sage-bg: #EDF5F0;
    --navy: #3D5A80;
    --navy-light: #6A8DB5;
    --navy-dark: #2A3F5A;
    --navy-bg: #EBF0F6;
    --interviewer: #2F6F9F;
    --interviewer-bg: #EAF4F8;
    --customer: #7A7F2F;
    --customer-bg: #F2F5E7;
    --charcoal: #2B2D42;
    --soft-peach: #F4ACB7;

    --font-ui: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
               'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;

    --radius: 5px;
    --shadow: 0 1px 3px rgba(43,45,66,0.06);
    --shadow-md: 0 3px 10px rgba(43,45,66,0.09);
    --trans: 180ms ease;
    --max-w: 760px;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-ui);
    background: var(--cream-dark);
    color: var(--charcoal);
    line-height: 1.6;
    min-height: 100vh;
}

.app-container { max-width: var(--max-w); margin: 0 auto; padding: 0 14px; }

/* ---- Header ---- */
.app-header { padding: 36px 0 22px; text-align: center; }
.header-inner {
    background: var(--cream);
    border-radius: 10px;
    padding: 36px 24px 32px;
    box-shadow: var(--shadow);
}
.app-title {
    font-size: 1.9rem;
    font-weight: 750;
    color: var(--navy-dark);
    letter-spacing: -0.01em;
}

/* ---- Tabs ---- */
.section-tabs { display: flex; gap: 6px; padding: 14px 0 10px; flex-wrap: wrap; justify-content: center; }
.section-tab {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 16px;
    border-radius: 999px;
    border: 1.5px solid var(--navy-light);
    background: var(--cream);
    color: var(--navy);
    font-size: 0.82rem; font-weight: 500;
    cursor: pointer;
    transition: all var(--trans);
    user-select: none;
}
.section-tab:hover { background: var(--navy); color: var(--cream); border-color: var(--navy); }
.section-tab.active { background: var(--navy); color: var(--cream); border-color: var(--navy); font-weight: 700; }
.tab-icon { font-weight: 750; }

/* ---- Section info ---- */
.section-info {
    background: var(--cream);
    border-radius: var(--radius);
    padding: 10px 18px;
    margin-bottom: 12px;
    box-shadow: var(--shadow);
    display: flex; align-items: center; justify-content: space-between;
    gap: 12px; flex-wrap: wrap;
}
.section-meta { display: flex; align-items: center; gap: 8px; }
.section-icon { font-size: 1.1rem; }
.section-title { font-size: 0.95rem; font-weight: 700; color: var(--navy-dark); }

.progress-container { display: flex; align-items: center; gap: 8px; min-width: 120px; }
.progress-bar { flex: 1; height: 5px; background: var(--cream-dark); border-radius: 999px; overflow: hidden; min-width: 60px; }
.progress-fill { height: 100%; background: linear-gradient(135deg, var(--sage), var(--sage-dark)); border-radius: 999px; transition: width 300ms ease; width: 0%; }
.progress-text { font-size: 0.78rem; font-weight: 700; color: var(--navy); min-width: 34px; text-align: right; font-variant-numeric: tabular-nums; }

/* ---- Controls ---- */
.controls-bar { display: flex; gap: 6px; padding: 0 0 12px; flex-wrap: wrap; }
.btn {
    display: inline-flex; align-items: center; gap: 5px;
    padding: 7px 15px; border-radius: 999px; border: none;
    font-size: 0.8rem; font-weight: 600;
    cursor: pointer; transition: all var(--trans); user-select: none;
}
.btn-control { background: var(--cream); color: var(--navy); border: 1.5px solid var(--navy-light); }
.btn-control:hover { background: var(--navy); color: var(--cream); }
.btn-control.active { background: var(--sage); color: #fff; border-color: var(--sage-dark); }

/* ---- Cards container ---- */
.cards-container { display: flex; flex-direction: column; gap: 18px; padding-bottom: 40px; }
.load-error {
    padding: 40px;
    text-align: center;
    color: #C5644A;
}

/* ================================================================
   ESSAY BLOCK
   ================================================================ */
.essay-block {
    background: var(--cream);
    border-radius: 10px;
    box-shadow: var(--shadow);
    overflow: hidden;
    scroll-margin-top: 20px;
}

/* Topic = main heading */
.essay-header {
    padding: 24px 24px 18px;
    border-bottom: 1px solid #EDE6D8;
}
.essay-topic {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--charcoal);
    line-height: 1.5;
    margin-bottom: 6px;
}
.essay-topic-cn {
    font-size: 0.95rem;
    color: var(--navy);
    line-height: 1.45;
    margin-bottom: 12px;
}
/* Title line: small muted secondary info */
.essay-meta-line {
    display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap;
}
.essay-meta-type {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--sage-dark);
}
.essay-meta-title {
    font-size: 0.8rem;
    color: #AAA;
}
.essay-meta-title-cn { font-size: 0.76rem; color: #C0C0C0; }

/* ---- Sentence Row ---- */
.sentence-row {
    display: flex; align-items: stretch;
    border-bottom: 1px solid #F3EFE6;
    scroll-margin-top: 16px;
    transition: background var(--trans);
}
.sentence-row:last-child { border-bottom: none; }
.sentence-row.active { background: #FFFCF6; }
.sentence-row.completed { background: #FAFCF8; }
.sentence-row.role-interviewer .sentence-main { border-left: 4px solid var(--interviewer); }
.sentence-row.role-customer .sentence-main { border-left: 4px solid var(--customer); }

.sentence-main {
    flex: 1; padding: 16px 20px;
    display: flex; flex-direction: column; gap: 8px;
    min-width: 0;
}
.role-badge {
    align-self: flex-start;
    padding: 2px 8px;
    border-radius: 999px;
    font-size: 0.68rem;
    font-weight: 750;
    letter-spacing: 0;
    line-height: 1.4;
}
.role-interviewer .role-badge {
    background: var(--interviewer-bg);
    color: var(--interviewer);
}
.role-customer .role-badge {
    background: var(--customer-bg);
    color: var(--customer);
}
.role-interviewer .sentence-en { color: #233F53; }
.role-customer .sentence-en { color: #343720; }

/* English — clean system sans-serif */
.sentence-en {
    font-size: 1.08rem;
    font-weight: 400;
    color: var(--charcoal);
    line-height: 1.7;
    text-align: left;
    letter-spacing: 0.005em;
}

/* Chinese — task2 navy, task1 sage */
.sentence-cn { font-size: 0.84rem; line-height: 1.5; text-align: left; }
.t2 .sentence-cn { color: var(--navy); }
.t1 .sentence-cn { color: var(--sage-dark); }

/* Input — underline style, no box */
.sentence-input {
    width: 100%;
    padding: 8px 0;
    border: none;
    border-bottom: 2px solid #E8E0D5;
    border-radius: 0;
    font-size: 1rem;
    color: var(--charcoal);
    background: transparent;
    resize: none;
    transition: border-color var(--trans);
    line-height: 1.6;
    outline: none;
}
.sentence-input:focus { border-bottom-color: var(--navy-light); }
.sentence-input:disabled { border-bottom-color: transparent; color: #999; }
.sentence-input.correct { border-bottom-color: var(--sage); color: var(--sage-dark); }
.sentence-input.wrong { border-bottom-color: var(--terracotta); }

/* Comparison */
.sentence-cmp { display: none; padding: 4px 0 0 0; font-size: 0.76rem; line-height: 1.4; }
.sentence-cmp.show { display: block; }
.sentence-cmp.ok { color: var(--sage-dark); }
.sentence-cmp.err { color: var(--terracotta); }
.diff-word { font-weight: 700; }
.diff-ok { color: var(--sage-dark); }
.diff-bad { color: var(--terracotta); }

/* ---- Right actions ---- */
.sentence-actions {
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    gap: 4px; padding: 16px 10px;
    border-left: 1px solid #F3EFE6;
    flex-shrink: 0; min-width: 40px;
}
.btn-icon {
    width: 30px; height: 30px; border-radius: 50%;
    border: none; font-size: 0.9rem;
    cursor: pointer; display: flex;
    align-items: center; justify-content: center;
    transition: all var(--trans);
    background: transparent;
}
.btn-icon:hover { transform: scale(1.14); }
.btn-icon.spk { color: var(--navy-light); }
.btn-icon.spk:hover { background: var(--navy-bg); color: var(--navy-dark); }
.btn-icon.spk.playing { background: var(--navy); color: #fff; animation: pulse 1s ease-in-out infinite; }
.btn-icon.pen { color: var(--sage-dark); }
.btn-icon.pen:hover { background: var(--sage-bg); color: var(--sage-dark); }
.done-mark { font-size: 1.1rem; }
.btn-icon-text { font-size: 0.72rem; font-weight: 750; }

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(61,90,128,0.4); }
    50% { box-shadow: 0 0 0 7px rgba(61,90,128,0); }
}

/* ---- Toast ---- */
.toast-container {
    position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
    z-index: 1000; display: flex; flex-direction: column; gap: 5px; pointer-events: none;
}
.toast {
    padding: 9px 18px; border-radius: 999px;
    background: var(--charcoal); color: #fff;
    font-size: 0.8rem; font-weight: 500;
    box-shadow: 0 6px 18px rgba(0,0,0,0.18);
    animation: t-in 280ms ease, t-out 280ms ease 1.8s forwards;
    text-align: center; pointer-events: auto;
}
.toast.ok { background: var(--sage-dark); }
.toast.info { background: var(--navy); }
@keyframes t-in { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
@keyframes t-out { from { opacity: 1; transform: translateY(0); } to { opacity: 0; transform: translateY(-8px); } }

/* ---- Float nav: split pill — left=jump, right=top ---- */
.float-nav {
    position: fixed; bottom: 22px; right: 22px;
    display: flex;
    border-radius: 999px;
    overflow: hidden;
    box-shadow: 0 4px 14px rgba(0,0,0,0.15);
    opacity: 0; pointer-events: none; z-index: 100;
    transition: opacity var(--trans);
}
.float-nav.visible { opacity: 1; pointer-events: auto; }
.float-nav .nav-half {
    width: 36px; height: 38px;
    border: none; background: var(--navy); color: #fff;
    font-size: 0.95rem; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: background var(--trans);
}
.float-nav .nav-half:hover { background: var(--terracotta); }
.float-nav .nav-divider {
    width: 1px; background: rgba(255,255,255,0.25);
}

/* ---- Footer ---- */
.app-footer { text-align: center; padding: 28px 12px 20px; color: #BBB; font-size: 0.75rem; }

/* ---- Responsive ---- */
@media (max-width: 640px) {
    .app-header { padding: 24px 0 14px; }
    .header-inner { padding: 28px 16px 24px; }
    .app-title { font-size: 1.5rem; }
    .essay-header { padding: 18px 16px 14px; }
    .essay-topic { font-size: 1.05rem; }
    .essay-topic-cn { font-size: 0.9rem; }
    .sentence-main { padding: 12px 14px; gap: 6px; }
    .sentence-en { font-size: 1rem; }
    .sentence-cn { font-size: 0.78rem; }
    .sentence-input { font-size: 0.94rem; }
    .sentence-actions { padding: 12px 6px; min-width: 34px; }
    .btn-icon { width: 26px; height: 26px; font-size: 0.8rem; }
    .section-info { flex-direction: column; align-items: flex-start; gap: 8px; }
    .progress-container { width: 100%; min-width: auto; }
}
@media (max-width: 400px) {
    .app-container { padding: 0 6px; }
    .essay-header { padding: 14px 12px 10px; }
    .sentence-main { padding: 10px 10px; }
    .sentence-en { font-size: 0.94rem; }
    .essay-topic { font-size: 0.98rem; }
}