/* tutor.css — Tutor Platform Styles
   Professional dashboard aesthetic for teachers
*/

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');
@import 'tutor_vars.css';

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

html, body {
    font-family: var(--tutor-font);
    font-size: 14px;
    background: var(--tutor-bg);
    color: var(--tutor-ink);
    line-height: 1.5;
    height: 100%;
}

/* ── Screens ──────────────────────────────────────────────── */
.screen { display: none; }
.screen.active { display: flex; min-height: 100vh; }

/* ── Auth Screen ──────────────────────────────────────────── */
#s-auth {
    align-items: center;
    justify-content: center;
    background: var(--tutor-slate);
    min-height: 100vh;
}

.auth-card {
    background: var(--tutor-surface);
    border-radius: var(--tutor-radius-l);
    padding: 40px;
    width: 100%;
    max-width: 440px;
    box-shadow: var(--tutor-shadow-m);
}

.auth-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 32px;
}

.auth-logo-mark {
    width: 36px;
    height: 36px;
    background: var(--tutor-amber);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
    color: var(--tutor-slate);
}

.auth-logo-text { font-size: 18px; font-weight: 700; color: var(--tutor-slate); }
.auth-logo-sub  { font-size: 12px; color: var(--tutor-ink3); margin-top: 1px; }

.auth-title { font-size: 22px; font-weight: 700; color: var(--tutor-ink); margin-bottom: 6px; }
.auth-sub   { font-size: 13px; color: var(--tutor-ink3); margin-bottom: 28px; }

.auth-tabs {
    display: flex;
    border-bottom: 2px solid var(--tutor-border);
    margin-bottom: 24px;
}

.auth-tab {
    flex: 1;
    padding: 10px;
    text-align: center;
    font-size: 13px;
    font-weight: 500;
    color: var(--tutor-ink3);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all 0.15s;
}

.auth-tab.active {
    color: var(--tutor-amber-d);
    border-bottom-color: var(--tutor-amber);
}

/* ── Form Elements ────────────────────────────────────────── */
.form-group { margin-bottom: 16px; }

.form-label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: var(--tutor-ink2);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.form-input {
    width: 100%;
    padding: 10px 12px;
    border: 1.5px solid var(--tutor-border-m);
    border-radius: var(--tutor-radius);
    font-size: 14px;
    font-family: var(--tutor-font);
    color: var(--tutor-ink);
    background: var(--tutor-surface);
    transition: border-color 0.15s;
    outline: none;
}

.form-input:focus { border-color: var(--tutor-amber); }
.form-input::placeholder { color: var(--tutor-ink4); }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

.form-hint { font-size: 11px; color: var(--tutor-ink3); margin-top: 4px; }

.form-error {
    background: #FEF2F2;
    border: 1px solid #FECACA;
    color: var(--tutor-error);
    border-radius: var(--tutor-radius);
    padding: 10px 12px;
    font-size: 13px;
    margin-bottom: 16px;
    display: none;
}
.form-error.show { display: block; }

.form-success {
    background: #F0FDF4;
    border: 1px solid #BBF7D0;
    color: var(--tutor-success);
    border-radius: var(--tutor-radius);
    padding: 10px 12px;
    font-size: 13px;
    margin-bottom: 16px;
    display: none;
}
.form-success.show { display: block; }

/* ── Buttons ──────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 16px;
    border-radius: var(--tutor-radius);
    font-size: 13px;
    font-weight: 600;
    font-family: var(--tutor-font);
    cursor: pointer;
    border: none;
    transition: all 0.15s;
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--tutor-amber);
    color: var(--tutor-slate);
}
.btn-primary:hover { background: var(--tutor-amber-d); }

.btn-secondary {
    background: var(--tutor-surface);
    color: var(--tutor-ink2);
    border: 1.5px solid var(--tutor-border-m);
}
.btn-secondary:hover { background: var(--tutor-bg); }

.btn-danger {
    background: #FEF2F2;
    color: var(--tutor-error);
    border: 1.5px solid #FECACA;
}
.btn-danger:hover { background: #FEE2E2; }

.btn-ghost {
    background: transparent;
    color: var(--tutor-ink3);
    border: none;
    padding: 6px 10px;
}
.btn-ghost:hover { background: var(--tutor-bg); color: var(--tutor-ink2); }

.btn-full { width: 100%; }

.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── App Layout ───────────────────────────────────────────── */
#s-app {
    flex-direction: row;
    min-height: 100vh;
}

/* ── Sidebar ──────────────────────────────────────────────── */
.tutor-sidebar {
    width: var(--tutor-sidebar);
    background: var(--tutor-slate);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 100;
    overflow-y: auto;
}

.sidebar-logo {
    padding: 20px 20px 16px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-logo-mark {
    width: 30px;
    height: 30px;
    background: var(--tutor-amber);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
    color: var(--tutor-slate);
    flex-shrink: 0;
}

.sidebar-logo-text {
    font-size: 14px;
    font-weight: 700;
    color: #fff;
    line-height: 1.2;
}

.sidebar-logo-sub { font-size: 10px; color: rgba(255,255,255,0.4); }

.sidebar-nav { flex: 1; padding: 16px 12px; }

.nav-section-label {
    font-size: 10px;
    font-weight: 600;
    color: rgba(255,255,255,0.3);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 0 8px;
    margin: 16px 0 6px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    border-radius: 6px;
    color: rgba(255,255,255,0.65);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
    margin-bottom: 2px;
    text-decoration: none;
}

.nav-item:hover { background: rgba(255,255,255,0.08); color: #fff; }
.nav-item.active { background: var(--tutor-amber); color: var(--tutor-slate); font-weight: 600; }
.nav-item .nav-icon { font-size: 16px; flex-shrink: 0; width: 18px; text-align: center; }
.nav-badge {
    margin-left: auto;
    background: var(--tutor-error);
    color: #fff;
    font-size: 10px;
    font-weight: 700;
    padding: 1px 6px;
    border-radius: 10px;
    min-width: 18px;
    text-align: center;
}

.sidebar-footer {
    padding: 16px 12px;
    border-top: 1px solid rgba(255,255,255,0.08);
}

.sidebar-user {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px;
    border-radius: 6px;
    cursor: pointer;
}
.sidebar-user:hover { background: rgba(255,255,255,0.06); }

.sidebar-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--tutor-amber);
    color: var(--tutor-slate);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 700;
    flex-shrink: 0;
}

.sidebar-user-name { font-size: 12px; font-weight: 600; color: #fff; }
.sidebar-user-role { font-size: 10px; color: rgba(255,255,255,0.4); }

/* ── Main Content ─────────────────────────────────────────── */
.tutor-main {
    margin-left: var(--tutor-sidebar);
    flex: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ── Top Header ───────────────────────────────────────────── */
.tutor-header {
    height: var(--tutor-header);
    background: var(--tutor-surface);
    border-bottom: 1px solid var(--tutor-border);
    display: flex;
    align-items: center;
    padding: 0 24px;
    gap: 16px;
    position: sticky;
    top: 0;
    z-index: 50;
}

.header-title { font-size: 16px; font-weight: 700; color: var(--tutor-ink); flex: 1; }
.header-sub   { font-size: 12px; color: var(--tutor-ink3); }

/* ── Page Content ─────────────────────────────────────────── */
.tutor-content { flex: 1; padding: 24px; }

/* ── Cards ────────────────────────────────────────────────── */
.card {
    background: var(--tutor-surface);
    border: 1px solid var(--tutor-border);
    border-radius: var(--tutor-radius-l);
    padding: 20px;
    box-shadow: var(--tutor-shadow);
}

.card-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--tutor-ink);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ── Stats Row ────────────────────────────────────────────── */
.stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--tutor-surface);
    border: 1px solid var(--tutor-border);
    border-radius: var(--tutor-radius-l);
    padding: 16px 20px;
    box-shadow: var(--tutor-shadow);
}

.stat-label { font-size: 11px; color: var(--tutor-ink3); font-weight: 600;
              text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: 4px; }
.stat-value { font-size: 28px; font-weight: 700; color: var(--tutor-ink); line-height: 1; }
.stat-sub   { font-size: 11px; color: var(--tutor-ink3); margin-top: 4px; }

/* ── Batch Cards ──────────────────────────────────────────── */
.batches-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.batch-card {
    background: var(--tutor-surface);
    border: 1px solid var(--tutor-border);
    border-radius: var(--tutor-radius-l);
    padding: 20px;
    cursor: pointer;
    transition: all 0.15s;
    box-shadow: var(--tutor-shadow);
}

.batch-card:hover {
    border-color: var(--tutor-amber);
    box-shadow: var(--tutor-shadow-m);
    transform: translateY(-1px);
}

.batch-card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 12px;
}

.batch-subject-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    text-transform: capitalize;
    background: var(--tutor-amber-l);
    color: var(--tutor-amber-d);
}

.batch-card-name { font-size: 15px; font-weight: 700; color: var(--tutor-ink); margin-bottom: 4px; }
.batch-card-meta { font-size: 12px; color: var(--tutor-ink3); }

.batch-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 16px;
    padding-top: 12px;
    border-top: 1px solid var(--tutor-border);
}

.batch-stat { text-align: center; }
.batch-stat-num  { font-size: 18px; font-weight: 700; color: var(--tutor-ink); }
.batch-stat-label { font-size: 10px; color: var(--tutor-ink3); }

.class-code-chip {
    font-family: var(--tutor-font-mono);
    font-size: 12px;
    font-weight: 600;
    background: var(--tutor-bg);
    border: 1px solid var(--tutor-border-m);
    border-radius: 4px;
    padding: 3px 8px;
    color: var(--tutor-ink2);
    cursor: pointer;
    user-select: all;
}
.class-code-chip:hover { background: var(--tutor-amber-l); border-color: var(--tutor-amber); }

/* ── Table ────────────────────────────────────────────────── */
.data-table { width: 100%; border-collapse: collapse; }
.data-table th {
    text-align: left;
    padding: 10px 12px;
    font-size: 11px;
    font-weight: 600;
    color: var(--tutor-ink3);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    border-bottom: 2px solid var(--tutor-border);
    background: var(--tutor-bg);
}
.data-table td {
    padding: 12px 12px;
    font-size: 13px;
    color: var(--tutor-ink2);
    border-bottom: 1px solid var(--tutor-border);
}
.data-table tr:hover td { background: var(--tutor-bg); }
.data-table tr:last-child td { border-bottom: none; }

/* ── Status Badges ────────────────────────────────────────── */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
}
.badge-pending   { background: #FEF3C7; color: #92400E; }
.badge-submitted { background: #DBEAFE; color: #1E40AF; }
.badge-reviewed  { background: #D1FAE5; color: #065F46; }
.badge-active    { background: #D1FAE5; color: #065F46; }
.badge-draft     { background: #F1F5F9; color: var(--tutor-ink3); }
.badge-overdue   { background: #FEE2E2; color: #991B1B; }

/* ── Modal ────────────────────────────────────────────────── */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    padding: 20px;
}
.modal-overlay.hidden { display: none; }

.modal-box {
    background: var(--tutor-surface);
    border-radius: var(--tutor-radius-l);
    padding: 28px;
    width: 100%;
    max-width: 560px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
}

.modal-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--tutor-ink);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-close {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--tutor-bg);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: var(--tutor-ink3);
}
.modal-close:hover { background: var(--tutor-border); }

/* ── Tabs ─────────────────────────────────────────────────── */
.tabs {
    display: flex;
    border-bottom: 2px solid var(--tutor-border);
    margin-bottom: 20px;
    gap: 2px;
}

.tab-btn {
    padding: 10px 16px;
    font-size: 13px;
    font-weight: 500;
    color: var(--tutor-ink3);
    cursor: pointer;
    border: none;
    background: none;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all 0.15s;
    font-family: var(--tutor-font);
}
.tab-btn:hover { color: var(--tutor-ink2); }
.tab-btn.active { color: var(--tutor-amber-d); border-bottom-color: var(--tutor-amber); font-weight: 600; }

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ── Pending screen ───────────────────────────────────────── */
#s-pending {
    align-items: center;
    justify-content: center;
    background: var(--tutor-bg);
    min-height: 100vh;
    flex-direction: column;
    gap: 16px;
    text-align: center;
    padding: 40px;
}

.pending-icon { font-size: 48px; margin-bottom: 8px; }
.pending-title { font-size: 22px; font-weight: 700; color: var(--tutor-ink); }
.pending-text  { font-size: 14px; color: var(--tutor-ink3); max-width: 400px; line-height: 1.6; }

/* ── Question Grid ────────────────────────────────────────── */
.question-grid { display: flex; flex-direction: column; gap: 16px; }

.question-card {
    background: var(--tutor-surface);
    border: 1px solid var(--tutor-border);
    border-radius: var(--tutor-radius);
    padding: 16px;
}

.question-card-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
}

.q-num { font-size: 11px; font-weight: 700; color: var(--tutor-ink3); }
.q-topic-badge { font-size: 10px; font-weight: 600; background: var(--tutor-teal-l);
                 color: var(--tutor-teal); padding: 2px 8px; border-radius: 10px; }
.q-tough-badge { font-size: 10px; font-weight: 600; background: var(--tutor-amber-l);
                 color: var(--tutor-amber-d); padding: 2px 8px; border-radius: 10px; }
.q-type-badge  { font-size: 10px; font-weight: 600; background: #EDE9FE;
                 color: #5B21B6; padding: 2px 8px; border-radius: 10px; }

.q-text { font-size: 14px; color: var(--tutor-ink); line-height: 1.5; margin-bottom: 10px; }

.q-remove-btn {
    margin-left: auto;
    font-size: 11px;
    color: var(--tutor-error);
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
}
.q-remove-btn:hover { background: #FEF2F2; }

/* ── Toughness Grid ───────────────────────────────────────── */
.tough-grid { border-collapse: collapse; width: 100%; }
.tough-grid th, .tough-grid td {
    padding: 8px 12px;
    border: 1px solid var(--tutor-border);
    text-align: center;
    font-size: 12px;
}
.tough-grid th { background: var(--tutor-bg); font-weight: 600; color: var(--tutor-ink2); }
.tough-grid td:first-child { text-align: left; font-weight: 500; color: var(--tutor-ink); }
.tough-count-input {
    width: 60px;
    padding: 4px 8px;
    border: 1px solid var(--tutor-border-m);
    border-radius: 4px;
    text-align: center;
    font-size: 13px;
    font-family: var(--tutor-font);
}
.tough-count-input:focus { outline: none; border-color: var(--tutor-amber); }

/* ── Toast ────────────────────────────────────────────────── */
.tutor-toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: var(--tutor-slate);
    color: #fff;
    padding: 12px 18px;
    border-radius: var(--tutor-radius);
    font-size: 13px;
    font-weight: 500;
    box-shadow: var(--tutor-shadow-m);
    z-index: 999;
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.25s;
    max-width: 320px;
}
.tutor-toast.show { transform: translateY(0); opacity: 1; }
.tutor-toast.success { background: var(--tutor-teal); }
.tutor-toast.error   { background: var(--tutor-error); }

/* ── Empty state ──────────────────────────────────────────── */
.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--tutor-ink3);
}
.empty-icon  { font-size: 40px; margin-bottom: 12px; }
.empty-title { font-size: 16px; font-weight: 600; color: var(--tutor-ink2); margin-bottom: 6px; }
.empty-text  { font-size: 13px; line-height: 1.5; }

/* ── Plan Badge (Sidebar) ─────────────────────────────────── */
.sidebar-plan-badge {
    margin: 0 12px 12px;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--tutor-radius);
    padding: 10px 12px;
    cursor: pointer;
    transition: background 0.15s;
}
.sidebar-plan-badge:hover { background: rgba(255,255,255,0.1); }

.plan-badge-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.plan-badge-left {
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 0;
}

.plan-badge-icon { font-size: 16px; flex-shrink: 0; }

.plan-badge-name {
    font-size: 12px;
    font-weight: 700;
    color: #fff;
    line-height: 1.2;
}

.plan-badge-sub {
    font-size: 10px;
    color: rgba(255,255,255,0.45);
    margin-top: 1px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.plan-badge-cta {
    font-size: 10px;
    font-weight: 700;
    background: var(--tutor-amber);
    color: var(--tutor-slate);
    padding: 3px 8px;
    border-radius: 20px;
    white-space: nowrap;
    flex-shrink: 0;
}

/* plan=pro: hide upgrade CTA, use teal tint */
.sidebar-plan-badge.is-pro { background: rgba(13,148,136,0.15); border-color: rgba(13,148,136,0.3); }
.sidebar-plan-badge.is-expired { background: rgba(239,68,68,0.1); border-color: rgba(239,68,68,0.25); }

/* ── Plan Banners ─────────────────────────────────────────── */
.plan-banner {
    position: fixed;
    top: 0;
    left: var(--tutor-sidebar);
    right: 0;
    z-index: 150;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 20px;
    font-size: 13px;
    font-weight: 500;
}
.plan-banner.hidden { display: none; }

.plan-banner--trial {
    background: #FFFBEB;
    border-bottom: 1px solid #FDE68A;
    color: #78350F;
}
.plan-banner--expired {
    background: #FEF2F2;
    border-bottom: 1px solid #FECACA;
    color: #7F1D1D;
}

.plan-banner-icon { font-size: 16px; flex-shrink: 0; }

.plan-banner span { flex: 1; }

.plan-banner-btn {
    background: var(--tutor-amber);
    color: var(--tutor-slate);
    border: none;
    border-radius: var(--tutor-radius);
    padding: 6px 14px;
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    white-space: nowrap;
    flex-shrink: 0;
}
.plan-banner-btn:hover { background: var(--tutor-amber-d); }

.plan-banner-close {
    background: none;
    border: none;
    font-size: 16px;
    cursor: pointer;
    color: inherit;
    opacity: 0.5;
    flex-shrink: 0;
    padding: 0 4px;
}
.plan-banner-close:hover { opacity: 1; }

/* push header down when banner is visible */
.tutor-main.has-banner { padding-top: 42px; }

/* ── Plan Cards (Upgrade Modal) ───────────────────────────── */
.plan-card {
    border: 2px solid var(--tutor-border);
    border-radius: var(--tutor-radius-l);
    padding: 20px;
    position: relative;
    transition: border-color 0.15s;
}
.plan-card:hover { border-color: var(--tutor-border-m); }

.plan-card--pro {
    border-color: var(--tutor-amber);
    background: linear-gradient(135deg, #FFFBEB 0%, #fff 60%);
}

.plan-card-badge {
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--tutor-amber);
    color: var(--tutor-slate);
    font-size: 10px;
    font-weight: 700;
    padding: 2px 10px;
    border-radius: 20px;
    white-space: nowrap;
}

.plan-card-header { margin-bottom: 16px; }

.plan-card-name {
    font-size: 16px;
    font-weight: 700;
    color: var(--tutor-ink);
    margin-bottom: 4px;
}

.plan-card-price {
    font-size: 24px;
    font-weight: 800;
    color: var(--tutor-ink);
}
.plan-card-price span {
    font-size: 13px;
    font-weight: 500;
    color: var(--tutor-ink3);
}

.plan-card-features {
    list-style: none;
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.plan-card-features li {
    font-size: 12px;
    color: var(--tutor-ink2);
}
.plan-feature-no { color: var(--tutor-ink4) !important; }

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 768px) {
    .tutor-sidebar { transform: translateX(-100%); transition: transform 0.2s; }
    .tutor-sidebar.open { transform: translateX(0); }
    .tutor-main { margin-left: 0; }
    .stats-row { grid-template-columns: 1fr 1fr; }
    .batches-grid { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
}