:root {
    --bg: #f5f7fb;
    --card: #ffffff;
    --text: #172033;
    --muted: #667085;
    --border: #e5eaf2;
    --primary: #246bfd;
    --primary-dark: #1754d6;
    --primary-soft: #eaf1ff;
    --success: #16a34a;
    --warning: #f59e0b;
    --radius: 24px;
    --shadow: 0 18px 50px rgba(21, 36, 64, 0.08);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: var(--bg);
    color: var(--text);
}

a { color: inherit; text-decoration: none; }

h1, h2, h3, p { margin-top: 0; }

.landing {
    min-height: 100vh;
    padding: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero {
    width: min(1100px, 100%);
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 32px;
    align-items: center;
}

.hero h1 {
    font-size: clamp(2.4rem, 6vw, 5rem);
    line-height: 0.95;
    letter-spacing: -0.06em;
    margin-bottom: 22px;
}

.hero-copy {
    font-size: 1.15rem;
    color: var(--muted);
    max-width: 590px;
    line-height: 1.7;
}

.eyebrow {
    color: var(--primary);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-size: 0.78rem;
    margin-bottom: 10px;
}

.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    border-radius: 999px;
    padding: 0 20px;
    font-weight: 800;
    border: 0;
    cursor: pointer;
    font-size: 0.95rem;
}

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: var(--primary-soft); color: var(--primary-dark); }
.btn.full { width: 100%; }

.preview-card,
.auth-card,
.panel,
.goal-card,
.stat-card,
.achievement-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.preview-card { padding: 28px; }
.preview-top { display: flex; justify-content: space-between; gap: 18px; margin-bottom: 18px; }
.preview-top span, .muted { color: var(--muted); }

.progress-track {
    height: 10px;
    background: #edf1f7;
    border-radius: 999px;
    overflow: hidden;
}

.progress-track span {
    display: block;
    height: 100%;
    background: linear-gradient(90deg, var(--primary), #58c4ff);
    border-radius: inherit;
}

.progress-track.big { height: 16px; margin: 24px 0 16px; }

.mini-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-top: 22px;
}

.mini-grid div {
    background: var(--bg);
    border-radius: 18px;
    padding: 14px;
}

.mini-grid strong, .mini-grid span { display: block; }
.mini-grid span { color: var(--muted); font-size: 0.85rem; margin-top: 4px; }

.auth-page {
    min-height: 100vh;
    padding: 24px;
    display: grid;
    place-items: center;
}

.auth-card {
    width: min(460px, 100%);
    padding: 30px;
}

.auth-brand {
    display: inline-flex;
    font-weight: 900;
    color: var(--primary);
    margin-bottom: 24px;
}

.auth-card h1 { margin-bottom: 8px; }
.auth-card p { color: var(--muted); line-height: 1.6; }

.form { display: grid; gap: 16px; margin-top: 22px; }
.form label { display: grid; gap: 8px; font-weight: 800; }
.form input, .form select {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 14px 15px;
    font: inherit;
    background: #fff;
}

.form input:focus, .form select:focus { outline: 3px solid var(--primary-soft); border-color: var(--primary); }
.auth-switch { text-align: center; margin: 18px 0 0; }
.auth-switch a { color: var(--primary); font-weight: 800; }

.alert {
    border-radius: 16px;
    padding: 14px 16px;
    margin: 16px 0;
    font-weight: 700;
}
.alert.error { background: #fff1f2; color: #be123c; }
.alert.success { background: #ecfdf3; color: #047857; }
.alert.fade { opacity: 0.35; transition: opacity 0.4s ease; }

.app-shell {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 270px 1fr;
}

.sidebar {
    background: #0f172a;
    color: #fff;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 900;
    font-size: 1.1rem;
}

.brand-mark {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border-radius: 14px;
    background: var(--primary);
}

.nav { display: grid; gap: 8px; }
.nav a, .logout-link {
    color: rgba(255,255,255,0.78);
    padding: 13px 14px;
    border-radius: 14px;
    font-weight: 750;
}
.nav a:hover, .logout-link:hover { background: rgba(255,255,255,0.08); color: #fff; }
.logout-link { margin-top: auto; }

.content { padding: 32px; overflow: hidden; }
.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 18px;
    margin-bottom: 28px;
}
.topbar h1 { margin: 0; font-size: clamp(2rem, 4vw, 3.2rem); letter-spacing: -0.045em; }

.dashboard-grid {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: 18px;
    margin-bottom: 22px;
}

.large-card, .stat-card, .panel, .achievement-card { padding: 24px; }
.card-heading, .section-heading {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
}
.card-heading h2 { font-size: clamp(1.8rem, 4vw, 3rem); letter-spacing: -0.05em; margin: 0; }
.pill {
    background: var(--primary-soft);
    color: var(--primary-dark);
    border-radius: 999px;
    padding: 8px 12px;
    font-weight: 900;
    white-space: nowrap;
}

.stat-card span { font-size: 1.8rem; }
.stat-card strong { display: block; font-size: 2.4rem; letter-spacing: -0.05em; margin-top: 12px; }
.stat-card p { color: var(--muted); margin-bottom: 0; }

.empty-state {
    background: var(--bg);
    border: 1px dashed var(--border);
    border-radius: 20px;
    padding: 28px;
    text-align: center;
}
.book-list { display: grid; gap: 12px; }
.book-row {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px;
    background: #fbfcff;
    border: 1px solid var(--border);
    border-radius: 18px;
}
.book-cover-small {
    width: 48px;
    height: 62px;
    border-radius: 12px;
    display: grid;
    place-items: center;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
    font-size: 1.4rem;
    flex: 0 0 auto;
}
.book-info { flex: 1; min-width: 0; display: grid; gap: 6px; }
.book-info span { color: var(--muted); font-size: 0.92rem; }
.book-percent { font-weight: 900; color: var(--primary); }

.split-panel {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 28px;
    align-items: start;
}
.compact-form { margin-top: 14px; }

.achievement-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
}
.achievement-card span { font-size: 2rem; }
.achievement-card h2 { margin: 14px 0 8px; }
.achievement-card p { color: var(--muted); line-height: 1.5; }
.achievement-card strong { color: var(--primary); }

@media (max-width: 980px) {
    .hero, .app-shell, .dashboard-grid, .split-panel { grid-template-columns: 1fr; }
    .sidebar { position: static; }
    .nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .achievement-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
    .landing, .content, .auth-page { padding: 18px; }
    .hero h1 { font-size: 3rem; }
    .mini-grid, .achievement-grid { grid-template-columns: 1fr; }
    .topbar { align-items: stretch; flex-direction: column; }
    .topbar .btn { width: 100%; }
    .nav { grid-template-columns: 1fr; }
    .sidebar { padding: 18px; }
}