/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --bg:        #0f1117;
    --surface:   #1a1d27;
    --surface2:  #22263a;
    --accent:    #6c63ff;
    --accent2:   #ff6584;
    --text:      #e8eaf0;
    --muted:     #8b8fa8;
    --border:    #2e3250;
    --radius:    14px;
    --shadow:    0 4px 24px rgba(0,0,0,0.4);
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Segoe UI', system-ui, sans-serif;
    min-height: 100vh;
    padding-bottom: 60px;
}

/* ── Header ── */
header {
    text-align: center;
    padding: 40px 20px 24px;
}

header h1 {
    font-size: 2.4rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

/* ── Header nav ── */
.header-nav {
    margin-top: 10px;
}

.header-nav-link {
    display: inline-block;
    padding: 6px 18px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: transparent;
    color: var(--muted);
    font-size: 0.83rem;
    font-weight: 600;
    text-decoration: none;
    transition: border-color 0.18s, color 0.18s;
}

.header-nav-link:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* ── Layout ── */
main {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

.top-panel {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 24px;
}

@media (max-width: 720px) {
    .top-panel { grid-template-columns: 1fr; }
}

/* ── Shared card style ── */
.timer-card,
.syllabus-card,
.results-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
}

/* ── Mode toggle ── */
.mode-toggle {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
}

.mode-btn {
    flex: 1;
    padding: 9px 0;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface2);
    color: var(--muted);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
}

.mode-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
    font-weight: 600;
}

.mode-btn:hover:not(.active) {
    border-color: var(--accent);
    color: var(--text);
}

/* ── Timer display ── */
.timer-display {
    font-size: 5.5rem;
    font-weight: 700;
    text-align: center;
    letter-spacing: 4px;
    color: var(--text);
    font-variant-numeric: tabular-nums;
    margin-bottom: 28px;
    transition: color 0.3s;
}

.timer-display.running { color: #7effa0; }
.timer-display.paused  { color: #ffd27e; }
.timer-display.done    { color: var(--accent2); }

/* ── Duration input ── */
.duration-input {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

.duration-input label {
    color: var(--muted);
    font-size: 0.85rem;
    white-space: nowrap;
}

.duration-input input[type="number"] {
    width: 72px;
    padding: 7px 10px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--surface2);
    color: var(--text);
    font-size: 0.95rem;
    text-align: center;
}

.apply-btn {
    padding: 7px 16px;
    border-radius: 8px;
    border: 1px solid var(--accent);
    background: transparent;
    color: var(--accent);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
}

.apply-btn:hover {
    background: var(--accent);
    color: #fff;
}

/* ── Timer control buttons ── */
.timer-controls {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
}

.ctrl-btn {
    flex: 1;
    padding: 12px 0;
    border-radius: 10px;
    border: none;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s, transform 0.1s;
}

.ctrl-btn:active { transform: scale(0.97); }

.ctrl-btn.start { background: var(--accent);  color: #fff; }
.ctrl-btn.pause { background: #ffd27e;         color: #1a1d27; }
/* Skip = warm amber outline — signals "save & stop early", distinct from neutral Reset */
.ctrl-btn.skip  { background: rgba(255,210,126,0.10); color: #ffd27e; border: 1px solid rgba(255,210,126,0.35); }

.ctrl-btn:hover { opacity: 0.88; }

/* ── Pomodoro info bar ── */
.pomodoro-info {
    font-size: 0.82rem;
    color: var(--muted);
    text-align: center;
    min-height: 20px;
}

/* ── Syllabus card ── */
.syllabus-card h2,
.results-card h2 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text);
}

.subject-input {
    width: 100%;
    padding: 10px 14px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--surface2);
    color: var(--text);
    font-size: 0.95rem;
    margin-bottom: 12px;
}

.syllabus-card textarea {
    width: 100%;
    height: 220px;
    padding: 12px 14px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--surface2);
    color: var(--text);
    font-size: 0.9rem;
    resize: vertical;
    line-height: 1.6;
    margin-bottom: 12px;
    font-family: inherit;
}

.syllabus-card textarea:focus,
.subject-input:focus,
.duration-input input:focus {
    outline: none;
    border-color: var(--accent);
}

.save-btn {
    padding: 9px 20px;
    border-radius: 8px;
    border: none;
    background: var(--accent);
    color: #fff;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s;
}

.save-btn:hover { opacity: 0.85; }

.save-status {
    margin-left: 12px;
    font-size: 0.82rem;
    color: #7effa0;
}

/* ── Results card ── */
.results-card { margin-top: 0; }

.results-empty {
    color: var(--muted);
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.results-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.results-table th,
.results-table td {
    padding: 10px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.results-table th {
    color: var(--muted);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.results-table tr:last-child td { border-bottom: none; }

.results-table tbody tr:hover { background: var(--surface2); }

.clear-btn {
    padding: 8px 18px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--muted);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
}

.clear-btn:hover {
    border-color: var(--accent2);
    color: var(--accent2);
}

.hidden { display: none; }

/* ════════════════════════════════════════════════════════
   STUD-16 / 17 / 18 / 19 — Multi-subject panel
   ════════════════════════════════════════════════════════ */

/* ── Syllabus card layout ── */
.syllabus-card {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.syllabus-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.syllabus-header h2 {
    margin-bottom: 0;   /* override the shared h2 rule */
}

.add-subject-btn {
    padding: 7px 14px;
    border-radius: 8px;
    border: 1px solid var(--accent);
    background: transparent;
    color: var(--accent);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.add-subject-btn:hover {
    background: var(--accent);
    color: #fff;
}

/* ── Scrollable subject list ── */
#subject-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
    max-height: 440px;
    overflow-y: auto;
    padding-right: 4px;   /* room for scrollbar */
}

#subject-list::-webkit-scrollbar { width: 5px; }
#subject-list::-webkit-scrollbar-track { background: transparent; }
#subject-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.syllabus-footer {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 16px;
    padding-top: 14px;
    border-top: 1px solid var(--border);
}

/* ── Individual subject card (STUD-16) ── */
.subject-card {
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    transition: border-color 0.2s;
}

.subject-card:focus-within {
    border-color: var(--accent);
}

.subject-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.subject-card-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.subject-remove-btn {
    background: none;
    border: none;
    color: var(--muted);
    font-size: 0.9rem;
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 6px;
    line-height: 1;
    transition: color 0.2s, background 0.2s;
}

.subject-remove-btn:hover {
    color: var(--accent2);
    background: rgba(255, 101, 132, 0.1);
}

/* ── Field wrapper ── */
.subject-field {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1;
}

/* ── Difficulty + Workload side-by-side (STUD-17 / STUD-18) ── */
.subject-row {
    display: flex;
    gap: 10px;
}

/* ── Shared input style for all subject fields ── */
.field-input {
    width: 100%;
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    font-size: 0.9rem;
    font-family: inherit;
    transition: border-color 0.2s;
}

.field-input:focus {
    outline: none;
    border-color: var(--accent);
}

/* Difficulty select arrow color fix on dark bg */
select.field-input {
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%238b8fa8' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 30px;
    cursor: pointer;
}

select.field-input option { background: var(--surface2); }

/* Notes textarea */
textarea.subject-notes {
    resize: vertical;
    min-height: 64px;
    line-height: 1.5;
}

/* ── Validation (STUD-19) ── */
.field-invalid {
    border-color: var(--accent2) !important;
}

.field-error {
    font-size: 0.75rem;
    color: var(--accent2);
    padding-left: 2px;
}

/* ════════════════════════════════════════════════════════
   STUD-20 — Study plan output panel
   ════════════════════════════════════════════════════════ */

.study-plan-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
}

.study-plan-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 8px;
}

.study-plan-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text);
}

.study-plan-total {
    font-size: 1rem;
    font-weight: 700;
    color: var(--accent);
}

/* Grid of per-subject plan items */
.study-plan-items {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 14px;
}

.plan-item {
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    transition: border-color 0.2s;
}

.plan-item:hover { border-color: var(--accent); }

.plan-item-name {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text);
    word-break: break-word;
}

.plan-item-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    flex-wrap: wrap;
}

.plan-hours {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent);
}

/* Difficulty badge */
.diff-badge {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 3px 8px;
    border-radius: 20px;
}

.diff-easy   { background: rgba(126,255,160,0.15); color: #7effa0; }
.diff-medium { background: rgba(255,210,126,0.15); color: #ffd27e; }
.diff-hard   { background: rgba(255,101,132,0.15); color: var(--accent2); }

/* STUD-23 — daily hours label */
.plan-daily {
    font-size: 0.82rem;
    color: var(--muted);
}

/* STUD-21 — topic notes preview */
.plan-notes {
    font-size: 0.78rem;
    color: var(--muted);
    font-style: italic;
    border-top: 1px solid var(--border);
    padding-top: 8px;
    word-break: break-word;
}

/* STUD-28 — why explanation */
.plan-reason {
    font-size: 0.78rem;
    color: var(--muted);
    border-top: 1px solid var(--border);
    padding-top: 8px;
}

/* STUD-29 — stale plan notice */
.plan-stale-notice {
    font-size: 0.82rem;
    color: #ffd27e;
    background: rgba(255, 210, 126, 0.08);
    border: 1px solid rgba(255, 210, 126, 0.25);
    border-radius: 8px;
    padding: 10px 14px;
    margin-bottom: 16px;
}

/* ════════════════════════════════════════════════════════
   STUD-31 / 32 — Auth bar + modal
   ════════════════════════════════════════════════════════ */

/* ── Auth bar (header) ── */
.auth-bar {
    margin-top: 16px;
    display: flex;
    justify-content: center;
}

.auth-guest,
.auth-user {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* .hidden (0,1,0) loses to .auth-guest/.auth-user (0,1,0) because they are declared
   later. Two-class rule (0,2,0) beats both — same pattern as .auth-modal.hidden. */
.auth-guest.hidden,
.auth-user.hidden { display: none; }

.auth-username {
    font-size: 0.88rem;
    color: var(--muted);
}

/* ── Shared auth button style ── */
.auth-link-btn {
    padding: 7px 16px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}

.auth-link-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.auth-link-btn.accent {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
    font-weight: 600;
}

.auth-link-btn.accent:hover {
    opacity: 0.85;
}

/* ── Modal overlay ── */
.auth-modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(3px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

/* .hidden alone (specificity 0,1,0) loses to .auth-modal (also 0,1,0) because
   .auth-modal is declared later. This two-class rule (specificity 0,2,0) wins both. */
.auth-modal.hidden { display: none; }

/* ── Modal box ── */
.auth-modal-box {
    position: relative;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px 32px 28px;
    width: 100%;
    max-width: 360px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.auth-modal-box h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text);
    margin: 0;
}

/* ── Close button ── */
.auth-modal-close {
    position: absolute;
    top: 14px;
    right: 16px;
    background: none;
    border: none;
    color: var(--muted);
    font-size: 1.3rem;
    line-height: 1;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
    transition: color 0.2s, background 0.2s;
}

.auth-modal-close:hover {
    color: var(--text);
    background: var(--surface2);
}

/* ── Auth fields ── */
.auth-field {
    display: flex;
    flex-direction: column;
}

.auth-field .field-input {
    background: var(--surface2);
}

/* ── Error message ── */
.auth-error {
    font-size: 0.82rem;
    color: var(--accent2);
    background: rgba(255, 101, 132, 0.08);
    border: 1px solid rgba(255, 101, 132, 0.25);
    border-radius: 8px;
    padding: 9px 13px;
}

/* ── Submit button ── */
.auth-submit-btn {
    width: 100%;
    padding: 11px;
    font-size: 0.95rem;
}

/* ── Switch link ── */
.auth-switch {
    text-align: center;
    font-size: 0.82rem;
    color: var(--muted);
    margin: 0;
}

.auth-switch .auth-link-btn {
    padding: 0;
    border: none;
    font-size: 0.82rem;
    color: var(--accent);
    font-weight: 600;
    vertical-align: baseline;
}

.auth-switch .auth-link-btn:hover {
    border: none;
    text-decoration: underline;
    color: var(--accent);
}

/* ════════════════════════════════════════════════════════
   Auth upgrade — Phase 1-3 new styles
   ════════════════════════════════════════════════════════ */

/* ── Modal box wider for register form ── */
.auth-modal-box.wide {
    max-width: 420px;
}

/* ── Field labels ── */
.auth-label {
    display: block;
    font-size: 0.78rem;
    color: var(--muted);
    margin-bottom: 5px;
    font-weight: 500;
}

/* ── Per-field inline error ── */
.auth-field-error {
    font-size: 0.75rem;
    color: var(--accent2);
    margin-top: 4px;
    min-height: 1em;
}

/* ── Password input with show/hide toggle ── */
.password-wrap {
    position: relative;
}

.password-wrap .field-input {
    padding-right: 42px;
    width: 100%;
}

.toggle-pw {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--muted);
    padding: 0;
    line-height: 1;
    transition: color 0.2s;
}

.toggle-pw:hover { color: var(--text); }

.toggle-pw svg {
    width: 17px;
    height: 17px;
    display: block;
}

/* ── Password strength bar ── */
.password-strength {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 6px;
}

.pw-strength-bar {
    flex: 1;
    height: 4px;
    border-radius: 2px;
    background: var(--border);
    position: relative;
    overflow: hidden;
}

.pw-strength-bar::after {
    content: '';
    position: absolute;
    left: 0; top: 0;
    height: 100%;
    width: var(--strength-pct, 0%);
    background: var(--strength-color, var(--accent));
    border-radius: 2px;
    transition: width 0.3s ease, background 0.3s ease;
}

.pw-strength-label {
    font-size: 0.73rem;
    min-width: 44px;
    font-weight: 500;
}

/* ── "or" divider ── */
.auth-divider {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--muted);
    font-size: 0.75rem;
    margin: 2px 0;
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}

/* ── Google sign-in button ── */
.google-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    padding: 10px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface2);
    color: var(--text);
    font-size: 0.88rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    text-decoration: none;
    transition: border-color 0.18s, background 0.18s;
}

.google-btn:hover {
    border-color: #4285F4;
    background: rgba(66, 133, 244, 0.07);
    color: var(--text);
    text-decoration: none;
}

.google-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

/* ── Unverified email notice inside login panel ── */
.unverified-notice {
    font-size: 0.82rem;
    color: #ffc107;
    background: rgba(255, 193, 7, 0.08);
    border: 1px solid rgba(255, 193, 7, 0.22);
    border-radius: 8px;
    padding: 9px 12px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
}

.unverified-notice .auth-link-btn {
    padding: 0;
    border: none;
    font-size: 0.82rem;
    color: #ffc107;
    font-weight: 600;
}

.unverified-notice .auth-link-btn:hover {
    border: none;
    text-decoration: underline;
    color: #ffc107;
}

/* ── Post-auth notification banner ── */
.auth-banner {
    max-width: 520px;
    margin: 0 auto 20px;
    padding: 10px 16px;
    border-radius: 8px;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

/* Same specificity fix as .auth-guest.hidden above. */
.auth-banner.hidden { display: none; }

.auth-banner.success {
    background: rgba(52, 168, 83, 0.10);
    border: 1px solid rgba(52, 168, 83, 0.28);
    color: #66bb6a;
}

.auth-banner.error {
    background: rgba(255, 101, 132, 0.08);
    border: 1px solid rgba(255, 101, 132, 0.25);
    color: var(--accent2);
}

.auth-banner-close {
    background: none;
    border: none;
    cursor: pointer;
    color: inherit;
    opacity: 0.65;
    font-size: 1.1rem;
    line-height: 1;
    padding: 0;
    flex-shrink: 0;
}

.auth-banner-close:hover { opacity: 1; }

/* ════════════════════════════════════════════════════════
   STUD-53/54/55/56/57 — Document input mode
   ════════════════════════════════════════════════════════ */

/* ── Input mode toggle in syllabus-header ── */
.input-mode-toggle {
    display: flex;
    gap: 6px;
}

/* Compact buttons for the header context (override flex:1 from .mode-btn) */
.input-mode-toggle .mode-btn {
    flex: none;
    padding: 7px 14px;
    font-size: 0.82rem;
}

/* ── Manual mode: "+ Add Subject" button row ── */
.manual-add-row {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 10px;
}

/* ── Document mode panel — use :not(.hidden) to avoid specificity conflict with .hidden ── */
#document-input-panel:not(.hidden) {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

/* Subject metadata fields at top of document mode */
.doc-subject-meta {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* Generic labelled section inside document panel */
.doc-section {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.doc-label {
    font-size: 0.82rem;
    color: var(--muted);
    font-weight: 500;
}

.doc-limit-note {
    font-weight: 400;
}

/* STUD-53: notes paste area */
.doc-notes-textarea {
    min-height: 120px;
    resize: vertical;
    line-height: 1.5;
}

/* STUD-54: file upload row */
.doc-upload-row {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.doc-file-input {
    flex: 1;
    min-width: 0;
    padding: 7px 10px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--surface2);
    color: var(--text);
    font-size: 0.85rem;
    font-family: inherit;
    cursor: pointer;
}

.doc-file-input::-webkit-file-upload-button {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--muted);
    border-radius: 6px;
    padding: 4px 10px;
    margin-right: 8px;
    font-size: 0.82rem;
    cursor: pointer;
    font-family: inherit;
}

.doc-file-input::-webkit-file-upload-button:hover {
    border-color: var(--accent);
    color: var(--text);
}

/* ════════════════════════════════════════════════════════
   STUD-58/59/60 — Study time estimation card
   ════════════════════════════════════════════════════════ */

.estimation-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
}

.estimation-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.estimation-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text);
}

.estimation-rationale {
    font-size: 0.82rem;
    color: var(--muted);
    font-style: italic;
}

/* Three option cards in a row */
.estimation-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
}

@media (max-width: 600px) {
    .estimation-options { grid-template-columns: 1fr; }
}

.estimation-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 22px 12px;
    border-radius: 10px;
    border: 2px solid var(--border);
    background: var(--surface2);
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
    text-align: center;
}

.estimation-option:hover {
    border-color: var(--accent);
}

.estimation-option.selected {
    border-color: var(--accent);
    background: rgba(108, 99, 255, 0.12);
}

.est-label {
    font-size: 0.8rem;
    color: var(--muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.est-time {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--accent);
}

/* ── Custom time option card ── */
.custom-time-card {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    padding: 16px 20px;
    border-radius: 10px;
    border: 2px solid var(--border);
    background: var(--surface2);
    margin-top: 14px;
    transition: all 0.2s;
}

.custom-time-card.selected {
    border-color: var(--accent);
    background: rgba(108, 99, 255, 0.12);
}

.custom-time-inputs {
    display: flex;
    align-items: center;
    gap: 6px;
}

.custom-time-input {
    width: 68px;
    text-align: center;
}

.custom-time-sep {
    font-size: 0.9rem;
    color: var(--muted);
    font-weight: 600;
}

/* ════════════════════════════════════════════════════════
   STUD-38/39/40 — Progress summary + remaining hours
   ════════════════════════════════════════════════════════ */

/* STUD-38/39: today / this-week stats bar */
.progress-summary {
    display: flex;
    gap: 28px;
    flex-wrap: wrap;
    margin-bottom: 16px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border);
}

.progress-summary:empty { display: none; }

.progress-stat {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.progress-label {
    font-size: 0.72rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.progress-value {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--accent);
}

/* STUD-40: per-subject remaining hours row in study plan items */
.plan-remaining {
    font-size: 0.78rem;
    color: #7effa0;
    font-weight: 500;
    min-height: 0;   /* collapses when empty */
}

/* ════════════════════════════════════════════════════════
   STUD-41/42/43/44/45 — UI/UX polish
   ════════════════════════════════════════════════════════ */

/* STUD-42: small hint text below card sub-headers */
.card-hint {
    font-size: 0.78rem;
    color: var(--muted);
    margin: -6px 0 4px;
    line-height: 1.45;
}

/* STUD-44: disabled button state */
button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* STUD-44: loading pulse animation for status text */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0.35; }
}

.save-status.loading {
    animation: pulse 1.2s ease-in-out infinite;
    color: var(--muted);
}

/* STUD-43: horizontal scroll wrapper for session results table */
.table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin-bottom: 16px;
}

.table-wrap .results-table {
    min-width: 440px;
    margin-bottom: 0;
}

/* STUD-43: laptop / tablet (≤ 720 px) tweaks */
@media (max-width: 720px) {
    #subject-list {
        max-height: 320px;
        overflow-y: auto;
    }

    .syllabus-footer {
        flex-wrap: wrap;
    }

    .estimation-header {
        flex-direction: column;
    }
}

/* STUD-43: mobile (≤ 480 px) tweaks */
@media (max-width: 480px) {
    header {
        padding: 20px 16px 16px;
    }

    header h1 {
        font-size: 1.6rem;
    }

    .timer-display {
        font-size: 3.8rem;
    }

    .duration-input {
        flex-wrap: wrap;
    }

    .syllabus-footer {
        flex-direction: column;
        align-items: stretch;
    }

    .syllabus-footer .save-btn,
    .syllabus-footer .apply-btn {
        width: 100%;
    }

    .study-plan-items {
        grid-template-columns: 1fr;
    }

    .timer-card,
    .syllabus-card,
    .estimation-card,
    .study-plan-card,
    .results-card {
        padding: 18px 14px;
    }
}

/* ════════════════════════════════════════════════════════
   Study Tracker page
   ════════════════════════════════════════════════════════ */

/* ── Header ── */
.tracker-page-header {
    padding: 28px 20px 20px;
}

.tracker-header-row {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
}

.tracker-back-btn {
    white-space: nowrap;
    margin-top: 6px;
}

/* ── Main layout ── */
.tracker-main {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px 60px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* ── Guest banner ── */
.tracker-guest-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 20px;
    font-size: 0.9rem;
    color: var(--muted);
}

/* .hidden (0,1,0) loses to .tracker-guest-banner (0,1,0) declared later.
   Two-class rule (0,2,0) wins — same pattern as .auth-guest.hidden. */
.tracker-guest-banner.hidden { display: none; }

/* ── Tab bar ── */
.tracker-tab-bar {
    display: flex;
    gap: 4px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 6px;
}

.tracker-tab {
    flex: 1;
    padding: 9px 0;
    border: none;
    border-radius: 10px;
    background: transparent;
    color: var(--muted);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.18s, color 0.18s;
}

.tracker-tab.active {
    background: var(--accent);
    color: #fff;
}

.tracker-tab:hover:not(.active) {
    background: var(--surface2);
    color: var(--text);
}

/* ── Shared tracker card ── */
.tracker-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}

.tracker-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 20px;
}

.tracker-section-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 14px;
}

/* ── Stat cards ── */
.tracker-stat-section {
    position: relative;
}

.tracker-stat-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.tracker-stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px 20px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.stat-label {
    font-size: 0.78rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.stat-value {
    font-size: 2.4rem;
    font-weight: 700;
    color: var(--accent);
    font-variant-numeric: tabular-nums;
    line-height: 1.1;
}

.stat-sub {
    font-size: 0.78rem;
    color: var(--muted);
}

/* Guest overlay on stat cards */
.guest-stat-overlay {
    position: absolute;
    inset: 0;
    background: rgba(15, 17, 23, 0.78);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(3px);
    border: 1px solid var(--border);
}

/* Same specificity fix as .tracker-guest-banner.hidden above. */
.guest-stat-overlay.hidden { display: none; }

.guest-stat-overlay p {
    color: var(--muted);
    font-size: 0.9rem;
    text-align: center;
    padding: 0 20px;
}

/* ── Range toggle ── */
.range-toggle {
    display: flex;
    gap: 4px;
    background: var(--surface2);
    border-radius: 10px;
    padding: 4px;
}

.range-btn {
    padding: 6px 16px;
    border: none;
    border-radius: 8px;
    background: transparent;
    color: var(--muted);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
}

.range-btn.active {
    background: var(--accent);
    color: #fff;
}

.range-btn:hover:not(.active) {
    background: var(--border);
    color: var(--text);
}

/* ── Period navigation ── */
.period-nav {
    display: flex;
    align-items: center;
    gap: 10px;
}

.period-nav-btn {
    width: 30px;
    height: 30px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface2);
    color: var(--text);
    font-size: 1.2rem;
    line-height: 1;
    cursor: pointer;
    transition: border-color 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.period-nav-btn:hover:not(:disabled) {
    border-color: var(--accent);
    color: var(--accent);
}

.period-nav-btn:disabled {
    cursor: default;
    color: var(--muted);
}

.period-label {
    font-size: 0.88rem;
    color: var(--text);
    font-weight: 600;
    min-width: 110px;
    text-align: center;
}

/* ── Chart area ── */
.chart-total-label {
    font-size: 0.82rem;
    color: var(--muted);
    margin-bottom: 8px;
    min-height: 1em;
}

.chart-canvas-wrap {
    width: 100%;
    overflow: hidden;
}

#focus-chart {
    display: block;
    width: 100%;
}

/* ── Lock / empty states ── */
.tracker-lock {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 40px 20px;
    text-align: center;
    color: var(--muted);
    font-size: 0.9rem;
}

/* Same specificity fix as .tracker-guest-banner.hidden above. */
.tracker-lock.hidden { display: none; }

.tracker-lock-icon {
    font-size: 2.4rem;
    line-height: 1;
}

.tracker-empty {
    color: var(--muted);
    font-size: 0.88rem;
    padding: 24px 0 8px;
    text-align: center;
}

/* ── Session status badges ── */
.tracker-status-done {
    color: #7effa0;
    font-size: 0.82rem;
    font-weight: 600;
}

.tracker-status-partial {
    color: #ffd27e;
    font-size: 0.82rem;
}

/* ── Ranking placeholder ── */
.tracker-ranking-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    padding: 60px 20px;
    text-align: center;
}

.tracker-ranking-placeholder h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text);
}

.tracker-ranking-placeholder p {
    color: var(--muted);
    font-size: 0.9rem;
    max-width: 480px;
}

.tracker-muted-hint {
    color: var(--muted);
    font-size: 0.82rem;
    font-style: italic;
}

/* ── Responsive ── */
@media (max-width: 720px) {
    .tracker-stat-cards { grid-template-columns: 1fr 1fr; }
    .tracker-card-header { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
    .tracker-stat-cards { grid-template-columns: 1fr; }
    .tracker-guest-banner { flex-direction: column; align-items: flex-start; }
    .stat-value { font-size: 1.9rem; }
}