:root {
    --pink: #ff1493;
    --magenta: #e91e8c;
    --gold: #ffd700;
    --orange: #ff6b35;
    --purple: #9b59b6;
    --cyan: #00d9ff;
    --green: #28785e;
    --ink: #201826;
    --muted: #6c6577;
    --paper: #fdf6fb;
    --line: #ecd9e8;
    color-scheme: light;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    background: var(--paper);
    color: var(--ink);
    font-family: 'Poppins', 'Segoe UI', sans-serif;
}

body.modal-open { overflow: hidden; }

.brand-icon { font-size: 1.2em; }

/* ---------------- Sign-in ---------------- */
.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #ff1493 0%, #9b59b6 60%, #00d9ff 100%);
    padding: 24px;
}
.auth-shell { width: min(440px, 100%); }
.auth-card {
    background: #fff;
    border-radius: 22px;
    padding: 34px 30px 40px;
    box-shadow: 0 24px 60px rgba(60, 12, 60, 0.32);
}
.eyebrow { margin: 0; text-transform: uppercase; letter-spacing: 0.14em; font-size: 12px; font-weight: 800; color: var(--magenta); }
.auth-title { font-family: 'Fredoka One', cursive; font-size: 30px; margin: 6px 0 0; display: flex; align-items: center; gap: 10px; }
.auth-logo { height: 88px; width: auto; display: block; }
.auth-copy { color: var(--muted); margin: 16px 0 22px; }
.auth-actions { display: grid; gap: 12px; }
.auth-status { padding: 12px 14px; border-radius: 12px; background: #f4eef8; font-size: 14px; }
.auth-status.error { background: #fde8ec; color: #b3123b; }
.auth-status.success { background: #e6f7ee; color: #12784f; }

.sso-button {
    display: flex; align-items: center; justify-content: center; gap: 10px;
    width: 100%; padding: 14px 18px; border-radius: 14px;
    border: 1px solid var(--line); background: #fff; color: var(--ink);
    font: inherit; font-weight: 700; cursor: pointer; transition: transform .05s, box-shadow .2s;
}
.sso-button:hover { box-shadow: 0 8px 20px rgba(120, 30, 110, 0.16); }
.sso-button:active { transform: translateY(1px); }
.sso-container:empty { display: none; }
.google-mark { width: 20px; height: 20px; }
.ms-mark { display: inline-grid; grid-template-columns: 9px 9px; gap: 2px; }
.ms-mark i { width: 9px; height: 9px; display: block; }
.ms-mark i:nth-child(1) { background: #f25022; }
.ms-mark i:nth-child(2) { background: #7fba00; }
.ms-mark i:nth-child(3) { background: #00a4ef; }
.ms-mark i:nth-child(4) { background: #ffb900; }

/* ---------------- App ---------------- */
.app-header {
    position: sticky; top: 0; z-index: 5;
    display: flex; align-items: center; justify-content: space-between; gap: 16px;
    padding: 16px clamp(16px, 4vw, 48px);
    background: #fff; border-bottom: 1px solid var(--line);
}
.app-brand { font-family: 'Fredoka One', cursive; font-size: 19px; display: flex; align-items: center; gap: 10px; }
.brand-logo { height: 76px; width: auto; display: block; }
.app-nav { display: flex; gap: 8px; }
.nav-btn { padding: 8px 18px; border: 1px solid var(--line); background: #fff; color: var(--muted); border-radius: 999px; font: inherit; font-weight: 700; cursor: pointer; }
.nav-btn.active { background: var(--magenta); border-color: var(--magenta); color: #fff; }
.app-user { display: flex; align-items: center; gap: 14px; }
.user-chip { font-size: 13px; color: var(--muted); font-weight: 600; }
.signout { color: var(--magenta); font-weight: 700; text-decoration: none; font-size: 14px; }

.app-main { width: min(1000px, calc(100% - 32px)); margin: clamp(24px, 5vw, 44px) auto; }
.loading { padding: 40px; text-align: center; color: var(--muted); }

.track { margin-bottom: 34px; }
.track-title { font-family: 'Fredoka One', cursive; font-size: 24px; margin: 0 0 16px; padding-left: 12px; border-left: 6px solid var(--green); }
.track-gold .track-title { border-left-color: var(--gold); }
.track-cyan .track-title { border-left-color: var(--cyan); }
.track-purple .track-title { border-left-color: var(--purple); }
.lesson-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 14px; }

.lesson-card {
    position: relative; text-align: left; cursor: pointer;
    display: grid; gap: 8px; padding: 18px 44px 18px 18px;
    background: #fff; border: 1px solid var(--line); border-left: 6px solid var(--green);
    border-radius: 14px; font: inherit; color: inherit; transition: transform .06s, box-shadow .2s;
}
.track-gold .lesson-card { border-left-color: var(--gold); }
.track-cyan .lesson-card { border-left-color: var(--cyan); }
.track-purple .lesson-card { border-left-color: var(--purple); }
.lesson-card:hover { box-shadow: 0 10px 24px rgba(120, 30, 110, 0.14); transform: translateY(-1px); }
.lesson-card-head { display: flex; align-items: center; gap: 8px; min-height: 20px; }
.lesson-num { font-family: 'Fredoka One', cursive; color: var(--magenta); }
.lesson-card-title { font-weight: 700; font-size: 16px; }
.title-num { color: var(--magenta); }
.lesson-card-meta { font-size: 12px; color: var(--muted); }
.lesson-card-go { position: absolute; right: 16px; top: 50%; transform: translateY(-50%); color: var(--magenta); }
.pill { font-size: 10px; font-weight: 800; text-transform: uppercase; letter-spacing: .06em; padding: 3px 8px; border-radius: 999px; }
.pill-intro { background: #e6f0ff; color: #2456c8; }
.pill-photo { background: #fff0e6; color: #b8531a; }

/* ---------------- Lesson view ---------------- */
.lesson-view {
    position: fixed; inset: 0; z-index: 20;
    background: rgba(30, 8, 30, 0.6); backdrop-filter: blur(4px);
    display: flex; justify-content: center; overflow-y: auto; padding: 0;
}
.lesson-view[hidden] { display: none; }
.lesson-panel { width: min(760px, 100%); background: var(--paper); min-height: 100vh; padding: 18px clamp(16px, 4vw, 34px) 60px; }
.lesson-close { background: none; border: none; color: var(--magenta); font: inherit; font-weight: 700; cursor: pointer; padding: 8px 0; }
.lesson-title { font-family: 'Fredoka One', cursive; font-size: 22px; margin: 6px 0 16px; }
.video-wrap { background: #000; border-radius: 14px; overflow: hidden; aspect-ratio: 16 / 9; }
.video-wrap video { width: 100%; height: 100%; display: block; }

.feed { margin-top: 22px; }
.composer { background: #fff; border: 1px solid var(--line); border-radius: 16px; padding: 14px; margin-bottom: 18px; }
.composer-tabs { display: flex; gap: 8px; margin-bottom: 12px; }
.composer-tab { flex: 1; padding: 9px; border: 1px solid var(--line); background: #fbf3f9; border-radius: 10px; font: inherit; font-weight: 700; color: var(--muted); cursor: pointer; }
.composer-tab.active { background: var(--magenta); border-color: var(--magenta); color: #fff; }
.composer-body { display: grid; gap: 10px; }
.composer-body[hidden] { display: none; }
textarea, .reply-form input { width: 100%; border: 1px solid var(--line); border-radius: 10px; padding: 11px; font: inherit; resize: vertical; }
.photo-drop { display: flex; align-items: center; justify-content: center; text-align: center; padding: 22px; border: 2px dashed var(--line); border-radius: 12px; cursor: pointer; color: var(--muted); }
.photo-drop:hover { border-color: var(--magenta); color: var(--magenta); }
.composer-status { margin: 4px 2px 0; font-size: 13px; color: var(--green); }
.composer-status.error { color: #b3123b; }

.btn-primary { background: var(--magenta); color: #fff; border: none; border-radius: 10px; padding: 11px 18px; font: inherit; font-weight: 700; cursor: pointer; justify-self: start; }
.btn-primary:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary.small { padding: 8px 14px; }

.feed-list { display: grid; gap: 14px; }
.feed-empty { color: var(--muted); text-align: center; padding: 20px; }
.feed-item { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 14px; }
.feed-head { font-weight: 700; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.role-badge { font-size: 10px; text-transform: uppercase; letter-spacing: .05em; font-weight: 800; padding: 2px 7px; border-radius: 999px; background: #efe6f6; color: var(--purple); }
.role-admin { background: #ffe9e0; color: #c1440e; }
.approved { color: var(--green); font-size: 13px; font-weight: 700; }
.feed-photo { display: block; margin: 10px 0; }
.feed-photo img { max-width: 100%; border-radius: 12px; display: block; }
.feed-body { margin: 8px 0 0; }
.feed-actions { display: flex; gap: 14px; margin-top: 10px; }
.link-btn { background: none; border: none; color: var(--magenta); font: inherit; font-weight: 600; cursor: pointer; padding: 0; }
.link-btn.danger { color: #b3123b; }
.feed-replies { margin-top: 10px; display: grid; gap: 8px; }
.feed-reply { background: #faf4f9; border-radius: 10px; padding: 10px; }
.reply-form { display: flex; gap: 8px; margin-top: 10px; }
.reply-form[hidden] { display: none; }
.reply-form input { flex: 1; }

/* ---------------- Activity ---------------- */
.activity-filters { display: flex; flex-wrap: wrap; gap: 12px 16px; margin-bottom: 20px; }
.activity-filters label { display: grid; gap: 4px; font-size: 12px; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; }
.activity-filters select { padding: 9px 12px; border: 1px solid var(--line); border-radius: 10px; font: inherit; background: #fff; color: var(--ink); min-width: 150px; }
.feed-context-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin: 2px 0 8px; }
.feed-context { background: #faf1f8; border: 1px solid var(--line); color: var(--magenta); font: inherit; font-weight: 700; font-size: 13px; padding: 4px 10px; border-radius: 999px; cursor: pointer; }
.feed-context:hover { background: #fce7f5; }
.feed-time { margin-left: auto; color: var(--muted); font-size: 12px; font-weight: 500; }
.replying { color: var(--muted); font-size: 12px; }
.activity-more { text-align: center; margin: 20px 0 8px; }

@media (max-width: 560px) {
    .lesson-grid { grid-template-columns: 1fr; }
    .app-header { flex-wrap: wrap; gap: 10px; padding: 14px 18px; }
    .app-nav { order: 3; width: 100%; }
    .nav-btn { flex: 1; }
    .app-brand { font-size: 16px; }
    .user-chip { display: none; }
    .activity-filters label { flex: 1 1 45%; }
    .activity-filters select { min-width: 0; width: 100%; }
    .feed-time { margin-left: 0; }
}