/* ─── Design Tokens ─────────────────────────────────────────────────────── */
:root {
    --bg:             #F8F7F5;
    --surface:        #FFFFFF;
    --surface-2:      #FDFCFB;
    --border:         #E6E3DD;
    --border-faint:   #EDEAE5;
    --ink:            #1A1917;
    --ink-2:          #6B6760;
    --ink-3:          #A8A49E;
    --accent:         #826E5A;
    --accent-hover:   #6D5C4B;
    --accent-subtle:  #F3EDE6;
    --accent-border:  #BDA88E;

    --green:          #2A5A3E;
    --green-bg:       #EBF5EF;
    --green-border:   #7BB898;
    --amber:          #8A5E14;
    --amber-bg:       #FBF4E3;
    --amber-border:   #CFA047;
    --red:            #8B2C2C;
    --red-bg:         #FBEDEC;
    --red-border:     #D07070;
    --blue:           #2A4B78;
    --blue-bg:        #ECF2FB;
    --blue-border:    #80A6D8;
    --orange-bg:      #FEF3E4;
    --orange-border:  #D4934A;

    --r:      10px;
    --r-sm:   7px;
    --r-xs:   5px;

    --shadow-xs: 0 1px 2px rgba(26,25,23,.05), 0 1px 4px rgba(26,25,23,.04);
    --shadow-sm: 0 2px 8px rgba(26,25,23,.07), 0 1px 3px rgba(26,25,23,.05);
    --shadow:    0 8px 24px rgba(26,25,23,.09), 0 2px 6px rgba(26,25,23,.05);
    --shadow-lg: 0 20px 48px rgba(26,25,23,.11), 0 4px 12px rgba(26,25,23,.07);

    --sans:        'Plus Jakarta Sans', ui-sans-serif, system-ui, sans-serif;
    --ease:        cubic-bezier(.25,.46,.45,.94);
    --ease-spring: cubic-bezier(.34,1.56,.64,1);
    --ease-out:    cubic-bezier(0,.55,.45,1);

    /* legacy aliases */
    --bg:    var(--bg);
    --paper: var(--bg);
    --panel: var(--surface);
    --line:  var(--border);
    --muted: var(--ink-2);
    --faint: var(--ink-3);
    --serif: var(--sans);

    --sidebar-w: 232px;
}

[data-theme="dark"] {
    --bg:             #0F0F0E;
    --surface:        #1A1917;
    --surface-2:      #201E1C;
    --border:         #2C2A26;
    --border-faint:   #232119;
    --ink:            #F0EDE7;
    --ink-2:          #8C8880;
    --ink-3:          #565250;
    --accent:         #C4A87E;
    --accent-hover:   #D4B88E;
    --accent-subtle:  #22190F;
    --accent-border:  #7A6248;

    --green:          #5CBF85;
    --green-bg:       #0D1F14;
    --green-border:   #2D5C3F;
    --amber:          #D4A84B;
    --amber-bg:       #1A1408;
    --amber-border:   #5C3F10;
    --red:            #D07070;
    --red-bg:         #1C0C0C;
    --red-border:     #5C2020;
    --blue:           #80A6D8;
    --blue-bg:        #0A1420;
    --blue-border:    #2A4B78;
    --orange-bg:      #1C1008;
    --orange-border:  #5C3018;

    --shadow-xs: 0 1px 2px rgba(0,0,0,.22), 0 1px 4px rgba(0,0,0,.18);
    --shadow-sm: 0 2px 8px rgba(0,0,0,.30), 0 1px 3px rgba(0,0,0,.22);
    --shadow:    0 8px 24px rgba(0,0,0,.38), 0 2px 6px rgba(0,0,0,.26);
    --shadow-lg: 0 20px 48px rgba(0,0,0,.46), 0 4px 12px rgba(0,0,0,.32);
}

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

html { color-scheme: light; }
[data-theme="dark"] { color-scheme: dark; }

body {
    background: var(--bg);
    color: var(--ink);
    font: 15px/1.6 var(--sans);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; }

/* ─── App shell ──────────────────────────────────────────────────────────── */
:root {
    --sidebar-rail: 56px;
}

.app-shell {
    display: flex;
    min-height: 100vh;
}

.app-main { flex: 1; min-width: 0; }

.has-sidebar .app-main { margin-left: var(--sidebar-rail); }

/* ─── Sidebar — left mini rail, expands on hover ─────────────────────────── */
.sidebar {
    width: var(--sidebar-rail);
    position: fixed;
    top: 0; left: 0;
    height: 100vh;
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    z-index: 100;
    overflow: hidden;
    transition: width 240ms var(--ease),
                background 220ms var(--ease),
                border-color 220ms var(--ease);
    box-shadow: none;
}

.sidebar:hover {
    width: var(--sidebar-w);
    box-shadow: var(--shadow);
}

/* Labels hidden when collapsed, fade in on hover */
.sidebar-brand-name,
.sidebar-link-label,
.sidebar-user-name,
.sidebar-controls,
.sidebar-logout {
    opacity: 0;
    transition: opacity 160ms var(--ease);
    white-space: nowrap;
    pointer-events: none;
}

.sidebar:hover .sidebar-brand-name,
.sidebar:hover .sidebar-link-label,
.sidebar:hover .sidebar-user-name,
.sidebar:hover .sidebar-controls,
.sidebar:hover .sidebar-logout {
    opacity: 1;
    pointer-events: auto;
}

/* ─── App topstrip ───────────────────────────────────────────────────────── */
.app-topstrip {
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 0 20px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 50;
    transition: background 220ms var(--ease), border-color 220ms var(--ease);
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 22px 20px;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    transition: border-color 220ms var(--ease);
}

.sidebar-brand-name {
    font-size: 16px;
    font-weight: 700;
    letter-spacing: -.02em;
    color: var(--ink);
}

/* ─── Brand mark ─────────────────────────────────────────────────────────── */
.brand-mark {
    width: 32px;
    height: 32px;
    display: inline-grid;
    place-items: center;
    border-radius: 8px;
    background: var(--accent);
    color: white;
    font-weight: 800;
    font-size: 15px;
    flex-shrink: 0;
    line-height: 1;
    letter-spacing: 0;
    transition: background 220ms var(--ease);
}

.brand-mark.large {
    width: 52px;
    height: 52px;
    font-size: 24px;
    border-radius: 14px;
}

/* ─── Sidebar nav ────────────────────────────────────────────────────────── */
.sidebar-nav {
    flex: 1;
    padding: 10px 12px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    overflow-y: auto;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    border-radius: var(--r-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--ink-2);
    transition: color 130ms var(--ease), background 130ms var(--ease);
}

.sidebar-link svg { flex-shrink: 0; opacity: .7; transition: opacity 130ms; }

.sidebar-link:hover {
    color: var(--ink);
    background: var(--bg);
}

.sidebar-link:hover svg { opacity: 1; }

.sidebar-link.active {
    color: var(--accent);
    background: var(--accent-subtle);
    font-weight: 600;
}

.sidebar-link.active svg { opacity: 1; color: var(--accent); }

/* ─── Sidebar section label ──────────────────────────────────────────────── */
.sidebar-label {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--ink-3);
    padding: 12px 12px 4px;
}

/* ─── Sidebar footer ─────────────────────────────────────────────────────── */
.sidebar-footer {
    border-top: 1px solid var(--border);
    padding: 14px 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex-shrink: 0;
    transition: border-color 220ms var(--ease);
}

.sidebar-user {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 4px;
}

.sidebar-user-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--accent-subtle);
    border: 1px solid var(--accent-border);
    display: grid;
    place-items: center;
    font-size: 11px;
    font-weight: 700;
    color: var(--accent);
    flex-shrink: 0;
}

.sidebar-user-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--ink);
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sidebar-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 6px;
}

/* ─── Theme toggle ───────────────────────────────────────────────────────── */
.theme-toggle {
    width: 32px;
    height: 32px;
    border-radius: var(--r-sm);
    border: 1px solid var(--border);
    background: transparent;
    color: var(--ink-2);
    cursor: pointer;
    display: grid;
    place-items: center;
    transition: background 130ms var(--ease), color 130ms var(--ease),
                border-color 130ms var(--ease);
    flex-shrink: 0;
}

.theme-toggle:hover { background: var(--bg); color: var(--ink); }

.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="dark"] .theme-toggle .icon-sun  { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* ─── Lang chips ─────────────────────────────────────────────────────────── */
.lang-form { display: flex; gap: 3px; }

.chip {
    padding: 5px 9px;
    background: var(--bg);
    border: 1.5px solid var(--ink-3);
    border-radius: var(--r-xs);
    color: var(--ink);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .04em;
    cursor: pointer;
    transition: background 130ms var(--ease), color 130ms var(--ease),
                border-color 130ms var(--ease);
}

.chip.active {
    background: var(--ink);
    border-color: var(--ink);
    color: var(--surface);
}

.chip:not(.active):hover { border-color: var(--ink-2); }

/* ─── Sidebar logout ─────────────────────────────────────────────────────── */
.sidebar-logout {
    background: none;
    border: none;
    font-size: 13px;
    font-weight: 500;
    color: var(--ink-3);
    cursor: pointer;
    padding: 0;
    transition: color 130ms var(--ease);
}

.sidebar-logout:hover { color: var(--red); }

/* ─── Page ───────────────────────────────────────────────────────────────── */
.page {
    width: min(1200px, calc(100vw - var(--sidebar-w) - 48px));
    margin: 32px auto 72px;
}

.page.full-bleed {
    width: 100%;
    margin: 0;
}

/* ─── Page topbar (inner, per-page) ─────────────────────────────────────── */
.page-header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 28px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
}

/* ─── Section head (legacy) ──────────────────────────────────────────────── */
.section-head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 28px;
}

.section-head h1 {
    font-size: 32px;
    font-weight: 700;
    letter-spacing: -.025em;
    line-height: 1.1;
}

.eyebrow {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .09em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 4px;
}

/* ─── Week controls ──────────────────────────────────────────────────────── */
.week-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

.week-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--ink-2);
    min-width: 100px;
    text-align: center;
}

/* ─── Lesson nav ─────────────────────────────────────────────────────────── */
.lesson-nav { display: flex; gap: 20px; margin-top: 8px; }

.lesson-nav-link {
    font-size: 13px;
    font-weight: 500;
    color: var(--ink-2);
    transition: color 120ms var(--ease);
}

.lesson-nav-link:not(.disabled):hover { color: var(--accent); }
.lesson-nav-link.disabled { color: var(--border); cursor: default; }

/* ─── Schedule grid ──────────────────────────────────────────────────────── */
.schedule-grid {
    display: grid;
    grid-template-columns: repeat(7, minmax(120px, 1fr));
    gap: 8px;
    align-items: start;
}

.day-column {
    min-height: 380px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r);
    overflow: hidden;
    box-shadow: var(--shadow-xs);
    transition: background 220ms var(--ease), border-color 220ms var(--ease);
}

.day-column.is-today {
    border-color: var(--accent);
    box-shadow: 0 0 0 1px var(--accent), var(--shadow-sm);
}

.day-head {
    padding: 10px 12px;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
    transition: background 220ms var(--ease), border-color 220ms var(--ease);
}

.day-column.is-today .day-head {
    background: var(--accent);
    border-bottom-color: transparent;
}

.day-column.is-today .day-head strong,
.day-column.is-today .day-head span { color: rgba(255,255,255,.95) !important; }

.day-head strong {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .06em;
    text-transform: uppercase;
    color: var(--ink);
}

.day-head span { font-size: 12px; color: var(--ink-2); }

.lesson-stack { padding: 7px; display: grid; gap: 7px; }

/* ─── Lesson card ────────────────────────────────────────────────────────── */
.lesson-card {
    display: grid;
    gap: 3px;
    padding: 9px 11px;
    border-radius: var(--r-sm);
    background: var(--surface);
    border: 1px solid var(--border);
    border-left: 3px solid var(--course-color, var(--accent));
    box-shadow: var(--shadow-xs);
    transition: transform 150ms var(--ease), box-shadow 150ms var(--ease),
                background 220ms var(--ease);
}

.lesson-card:hover,
.course-row:hover,
.link-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.lesson-time {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: .06em;
    text-transform: uppercase;
    color: var(--ink-2);
}

.lesson-card span  { color: var(--ink-2); }
.lesson-card strong { font-size: 12px; line-height: 1.3; }
.lesson-card em     { font-style: normal; font-size: 11px; color: var(--ink-3); }

small, .muted { color: var(--ink-2); }
.status-cancelled { opacity: .45; }

.empty-slot {
    color: var(--ink-3);
    font-size: 12px;
    padding: 12px 8px;
    text-align: center;
    border: 1px dashed var(--border);
    border-radius: var(--r-sm);
}

/* ─── Content grid ───────────────────────────────────────────────────────── */
.content-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    margin-top: 20px;
}

.content-grid.two {
    grid-template-columns: minmax(0, 1.3fr) minmax(260px, 0.7fr);
}

/* ─── Panels ─────────────────────────────────────────────────────────────── */
.panel, .login-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r);
    padding: 22px 24px;
    box-shadow: var(--shadow-xs);
    transition: background 220ms var(--ease), border-color 220ms var(--ease);
}

.panel h2 {
    font-size: 16px;
    font-weight: 700;
    letter-spacing: -.01em;
    margin-bottom: 16px;
    color: var(--ink);
}

.panel h3 {
    font-size: 14px;
    font-weight: 700;
    letter-spacing: -.005em;
    margin-bottom: 10px;
}

/* ─── Course list ────────────────────────────────────────────────────────── */
.course-list, .people-list, .homework-stack, .chat-list, .submission-list {
    display: grid;
    gap: 6px;
}

.course-row {
    display: grid;
    grid-template-columns: 6px minmax(0, 1fr);
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: var(--r-sm);
    background: var(--surface);
    transition: transform 150ms var(--ease), box-shadow 150ms var(--ease),
                background 220ms var(--ease);
}

.course-row span:last-child {
    display: grid;
    gap: 1px;
    min-width: 0;
}

.course-row strong,
.course-row small {
    display: block;
}

.course-dot {
    width: 6px;
    height: 28px;
    border-radius: 999px;
    flex-shrink: 0;
}

/* ─── People ─────────────────────────────────────────────────────────────── */
.person {
    padding: 8px 12px;
    border-radius: var(--r-sm);
    background: var(--bg);
    border: 1px solid var(--border);
    font-size: 14px;
    transition: background 220ms var(--ease);
}

.teacher-line {
    background: var(--green-bg);
    border-color: var(--green-border);
    font-weight: 600;
}

/* ─── Cards ──────────────────────────────────────────────────────────────── */
.chat-message, .homework-card, .submission-box {
    border: 1px solid var(--border);
    border-radius: var(--r-sm);
    padding: 14px 16px;
    background: var(--surface);
    transition: background 220ms var(--ease);
}

.chat-message header, .homework-card header {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 8px;
}

.chat-message p:last-child,
.homework-card p:last-child { margin-bottom: 0; }

/* ─── Meta list ──────────────────────────────────────────────────────────── */
.meta-list {
    display: grid;
    grid-template-columns: 110px 1fr;
    gap: 10px 16px;
    margin: 0 0 18px;
    font-size: 14px;
}

.meta-list dt {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .06em;
    text-transform: uppercase;
    color: var(--ink-2);
    padding-top: 2px;
}

.meta-list dd { margin: 0; }

/* ─── Forms ──────────────────────────────────────────────────────────────── */
.form-stack { display: grid; gap: 14px; }
.form-stack.compact { margin-top: 14px; gap: 10px; }
.form-stack label, .form-stack p { margin: 0; display: grid; gap: 5px; }

.form-stack label > span {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .07em;
    text-transform: uppercase;
    color: var(--ink-2);
}

input[type="text"],
input[type="password"],
input[type="url"],
input[type="datetime-local"],
textarea,
select {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: var(--r-sm);
    padding: 10px 13px;
    background: var(--surface);
    color: var(--ink);
    outline: none;
    transition: border-color 150ms var(--ease), box-shadow 150ms var(--ease),
                background 220ms var(--ease);
}

input[type="text"]:focus,
input[type="password"]:focus,
input[type="url"]:focus,
input[type="datetime-local"]:focus,
textarea:focus,
select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-subtle);
}

textarea { resize: vertical; }

/* ─── Buttons ────────────────────────────────────────────────────────────── */
.primary-button, .ghost-button, .link-button {
    border-radius: var(--r-sm);
    border: 1px solid transparent;
    padding: 8px 15px;
    cursor: pointer;
    font-weight: 600;
    font-size: 13px;
    line-height: 1;
    transition: background 130ms var(--ease), color 130ms var(--ease),
                border-color 130ms var(--ease), transform 130ms var(--ease),
                box-shadow 130ms var(--ease);
}

.primary-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--accent);
    color: white;
}

.primary-button:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 14px color-mix(in srgb, var(--accent) 35%, transparent);
}

.primary-button:active { transform: translateY(0); }

.ghost-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-color: var(--border);
    background: var(--surface);
    color: var(--ink);
}

.ghost-button:hover { border-color: var(--ink-3); background: var(--bg); }

.ghost-button.disabled {
    cursor: default;
    opacity: .4;
    pointer-events: none;
}

.inline-action { margin-top: 10px; width: fit-content; }

.button-row {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.link-button {
    background: transparent;
    color: var(--ink-2);
    padding-inline: 4px;
    font-size: 13px;
}

.link-button:hover { color: var(--ink); }

/* ─── Attendance roster ──────────────────────────────────────────────────── */
.attendance-list { display: grid; gap: 10px; }

.roster { display: grid; gap: 0; margin-bottom: 16px; }

.roster-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 136px 110px;
    align-items: center;
    gap: 10px;
    padding: 9px 0;
    border-top: 1px solid var(--border);
}

.roster-name {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--ink);
    flex: 1;
    min-width: 0;
}

.roster-select {
    flex-shrink: 0;
    width: 136px;
    min-width: 136px;
    padding: 6px 8px;
    padding-right: 28px;
    border: 1px solid var(--border);
    border-radius: var(--r-sm);
    background: var(--surface);
    color: var(--ink);
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
    outline: none;
    transition: border-color 150ms var(--ease), box-shadow 150ms var(--ease);
}

.roster-select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-subtle); }

.roster-select.status-present  { background: var(--green-bg);  border-color: var(--green-border);  color: var(--green); }
.roster-select.status-absent   { background: var(--orange-bg); border-color: var(--orange-border); color: #8a4c13; }
.roster-select.status-unknown  { background: var(--bg);        border-color: var(--border);        color: var(--ink-2); }

.roster-hw {
    display: flex;
    gap: 5px;
    flex-wrap: wrap;
    flex-shrink: 0;
    min-width: 0;
    justify-content: flex-end;
}

.hw-pill {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 999px;
    border: 1px solid;
    font-size: 11px;
    font-weight: 600;
    white-space: nowrap;
    transition: opacity 130ms;
}

.hw-pill:hover { opacity: .8; }

.hw-pill.status-submitted      { background: var(--blue-bg);   border-color: var(--blue-border);   color: var(--blue); }
.hw-pill.status-reviewed       { background: var(--green-bg);  border-color: var(--green-border);  color: var(--green); }
.hw-pill.status-needs_revision { background: var(--amber-bg);  border-color: var(--amber-border);  color: var(--amber); }
.hw-pill.status-not-submitted  { background: var(--bg);        border-color: var(--border);        color: var(--ink-3); }

/* Course homework table */
.course-homework-table { display: grid; gap: 6px; }

.course-homework-head,
.course-homework-row {
    display: grid;
    grid-template-columns: 150px minmax(180px, 1fr) 170px minmax(240px, 1.2fr);
    align-items: center;
    gap: 12px;
}

.course-homework-head {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .07em;
    color: var(--ink-2);
}

.course-homework-row { padding: 10px 0; border-top: 1px solid var(--border); }

.attendance-badge {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    border-radius: var(--r-sm);
    border: 1px solid;
    padding: 4px 9px;
    font-size: 12px;
    font-weight: 600;
}

.status-present  { background: var(--green-bg);  border-color: var(--green-border);  color: var(--green); }
.status-absent   { background: var(--orange-bg);  border-color: var(--orange-border); color: #8a4c13; }
.status-unknown  { background: var(--bg);         border-color: var(--border);        color: var(--ink-2); }

/* ─── Homework mini list ─────────────────────────────────────────────────── */
.homework-mini-list { display: grid; gap: 4px; }

.homework-mini-link {
    display: grid;
    gap: 2px;
    padding: 6px 10px;
    border: 1px solid var(--border);
    border-radius: var(--r-xs);
    background: var(--surface);
    font-size: 12px;
    transition: background 220ms var(--ease);
}

.homework-mini-link.status-submitted      { border-color: var(--blue-border);   background: var(--blue-bg); }
.homework-mini-link.status-reviewed       { border-color: var(--green-border);  background: var(--green-bg); }
.homework-mini-link.status-needs_revision { border-color: var(--amber-border);  background: var(--amber-bg); }
.homework-mini-link.status-not-submitted  { border-color: var(--orange-border); background: var(--orange-bg); }

/* ─── Files ──────────────────────────────────────────────────────────────── */
.file-list { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }

.file-list a {
    border: 1px solid var(--blue-border);
    border-radius: var(--r-xs);
    padding: 4px 10px;
    font-size: 12px;
    color: var(--blue);
    background: var(--blue-bg);
    max-width: 260px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    transition: border-color 120ms var(--ease);
}

.file-list a:hover { border-color: var(--blue); }

.submission-files-block {
    display: grid;
    gap: 10px;
}

.submission-files-picker {
    display: grid;
    gap: 6px;
    font-size: 12px;
    font-weight: 600;
    color: var(--ink-2);
}

.submission-files-picker input[type="file"] {
    font-size: 12px;
    color: var(--ink);
}

.editable-file-list {
    display: grid;
    gap: 8px;
}

.editable-file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: var(--r-xs);
    background: var(--bg);
}

.editable-file-item a,
.editable-file-name {
    min-width: 0;
    font-size: 12px;
    color: var(--blue);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.editable-file-name {
    color: var(--ink);
}

.editable-file-remove-button {
    width: 24px;
    height: 24px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--surface);
    color: var(--ink-2);
    display: inline-grid;
    place-items: center;
    flex-shrink: 0;
    font-size: 16px;
    line-height: 1;
    cursor: pointer;
    transition: border-color 120ms var(--ease), color 120ms var(--ease),
                background 120ms var(--ease);
}

.editable-file-remove-button:hover {
    border-color: var(--red-border);
    color: var(--red);
    background: var(--red-bg);
}

.teacher-comment {
    padding: 10px 14px;
    background: var(--green-bg);
    border-left: 3px solid var(--green-border);
    border-radius: var(--r-xs);
    margin-top: 8px;
    font-size: 14px;
}

/* ─── Messages ───────────────────────────────────────────────────────────── */
.messages { display: grid; gap: 8px; margin-bottom: 20px; }

.message {
    padding: 10px 14px;
    border-radius: var(--r-sm);
    background: var(--green-bg);
    border-left: 3px solid var(--green-border);
    font-size: 14px;
}

.message.error {
    background: var(--red-bg);
    border-left-color: var(--red-border);
    color: var(--red);
}

/* ─── Login ──────────────────────────────────────────────────────────────── */
@keyframes fadeIn    { from { opacity: 0; }                         to { opacity: 1; } }
@keyframes slideInUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }

.login-shell {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #1A1612;
}

[data-theme="dark"] .login-shell { background: #0D0B09; }

.login-center {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    padding: 24px 16px;
    width: 100%;
}

.login-card {
    width: min(380px, 100%);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r);
    padding: 32px;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    gap: 24px;
    animation: slideInUp 380ms var(--ease) both;
    transition: background 220ms var(--ease), border-color 220ms var(--ease);
}

.login-card .form-stack { gap: 14px; }

.login-card input[type="text"],
.login-card input[type="password"] {
    padding: 11px 14px;
    font-size: 15px;
}

/* Controls row inside card (lang + theme toggle) */
.login-card-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Chips inside the dark login shell */
.login-card .chip {
    background: var(--bg);
    border-color: var(--ink-3);
    color: var(--ink);
}
.login-card .chip.active {
    background: var(--ink);
    border-color: var(--ink);
    color: var(--surface);
}

/* Wordmark below the card */
.login-wordmark {
    display: flex;
    align-items: center;
    gap: 10px;
    opacity: .35;
    animation: slideInUp 380ms 120ms var(--ease) both;
}

.login-brand-mark {
    width: 26px;
    height: 26px;
    font-size: 12px;
    border-radius: 7px;
}

.login-wordmark-text {
    font-size: 14px;
    font-weight: 700;
    letter-spacing: -.01em;
    color: #fff;
}

.login-submit {
    width: 100%;
    padding: 12px;
    font-size: 15px;
    margin-top: 4px;
}

/* ─── Teacher lesson hw list ─────────────────────────────────────────────── */
.lesson-hw-list { display: grid; gap: 0; }

.lesson-hw-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 12px 0;
    border-top: 1px solid var(--border);
}

.lesson-hw-row:first-child { border-top: none; }

.lesson-hw-meta {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.lesson-hw-date {
    font-size: 12px;
    font-weight: 600;
    color: var(--ink-2);
    letter-spacing: .01em;
}

.lesson-hw-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--ink);
}

.lesson-hw-stats {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.hw-stat {
    font-size: 12px;
    font-weight: 600;
    padding: 3px 9px;
    border-radius: var(--r-xs);
    border: 1px solid;
}

.hw-stat-reviewed    { background: var(--green-bg);  border-color: var(--green-border);  color: var(--green); }
.hw-stat-submitted   { background: var(--blue-bg);   border-color: var(--blue-border);   color: var(--blue); }
.hw-stat-revision    { background: var(--amber-bg);  border-color: var(--amber-border);  color: var(--amber); }
.hw-stat-missing     { background: var(--bg);        border-color: var(--border);        color: var(--ink-2); }

/* ─── Submission review list ─────────────────────────────────────────────── */
.submission-review-list { display: grid; gap: 10px; }

.submission-review-card {
    border: 1px solid var(--border);
    border-radius: var(--r);
    overflow: hidden;
    background: var(--surface);
    transition: background 220ms var(--ease), border-color 220ms var(--ease);
}

.submission-review-card.has-submission { border-color: var(--border); }

.submission-review-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 18px;
    border-bottom: 1px solid var(--border-faint);
    background: var(--bg);
}

.submission-review-student {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    font-weight: 600;
}

.submission-text {
    padding: 14px 18px;
    font-size: 14px;
    line-height: 1.6;
    color: var(--ink);
    border-bottom: 1px solid var(--border-faint);
}

.submission-review-form {
    padding: 12px 18px;
    background: var(--surface-2);
}

.review-form-row {
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.review-form-row select { flex: 0 0 auto; width: auto; }
.review-form-row textarea {
    flex: 1;
    min-height: 60px;
    resize: vertical;
    font-size: 13px;
}

/* ─── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 1100px) {
    :root { --sidebar-w: 200px; }
}

@media (max-width: 860px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 240ms var(--ease), background 220ms var(--ease);
    }

    .sidebar.open { transform: translateX(0); }

    .has-sidebar .app-main { margin-left: 0; }

    .page {
        width: calc(100vw - 32px);
        margin: 20px auto 48px;
    }

    .schedule-grid {
        grid-template-columns: repeat(3, minmax(160px, 1fr));
        overflow-x: auto;
    }

    .content-grid.two { grid-template-columns: 1fr; }

    .section-head {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .login-shell { flex-direction: column; height: auto; min-height: 100vh; }
    .login-brand-panel { width: 100%; min-height: 200px; padding: 36px 28px; }
    .login-brand-inner { flex-direction: row; align-items: center; gap: 20px; }
    .login-headline h1 { font-size: 28px; }
    .login-rule { display: none; }
    .login-form-panel { padding: 32px 24px 48px; }
}