:root {
    --bg: #0d1117;
    --bg-elev: #161b22;
    --bg-elev-2: #1f2630;
    --surface: #11161c;
    --surface-soft: #151b24;
    --text: #e6edf3;
    --text-soft: #9fb0c3;
    --text-dim: #7f91a8;
    --line: #30363d;
    --line-strong: #3d444d;
    --accent: #2f81f7;
    --accent-soft: #1f6feb;
    --success: #3fb950;
    --danger: #f85149;
    --shadow-sm: 0 1px 0 rgba(255, 255, 255, 0.02);
    --shadow-md: 0 12px 28px rgba(1, 4, 9, 0.28);
    --radius-sm: 8px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --ease: cubic-bezier(0.2, 0, 0, 1);
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }

body {
    background: var(--bg);
    color: var(--text);
    font-family: Manrope, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-size: 14px;
    line-height: 1.4;
}

h1, h2, h3, h4 {
    margin: 0;
    font-family: Fraunces, Georgia, serif;
    letter-spacing: 0;
}

p { margin: 0; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }

.shell {
    width: min(1180px, calc(100vw - 2rem));
    margin: 1rem auto 2rem;
}

.topbar {
    position: sticky;
    top: 0.8rem;
    z-index: 20;
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 1rem;
    padding: 0.8rem 1rem;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background: var(--bg-elev);
    box-shadow: var(--shadow-md);
}

.brand, .brand-button {
    border: 0;
    background: transparent;
    color: var(--text);
    padding: 0;
    cursor: pointer;
    font: 700 1.45rem/1 Fraunces, Georgia, serif;
}

.main-nav { display: flex; gap: 0.45rem; justify-self: center; }
.account { display: flex; gap: 0.55rem; align-items: center; }

.user-chip {
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--text-soft);
    padding: 0.3rem 0.65rem;
    font-size: 0.82rem;
}

.nav-btn,
.ghost-btn,
.ghost-link {
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--surface-soft);
    color: var(--text-soft);
    padding: 0.45rem 0.8rem;
    cursor: pointer;
    transition: border-color 130ms var(--ease), color 130ms var(--ease), background 130ms var(--ease);
}

.nav-btn:hover, .ghost-btn:hover, .ghost-link:hover {
    border-color: var(--line-strong);
    color: var(--text);
}

.nav-btn.active {
    border-color: rgba(47, 129, 247, 0.55);
    color: #c7dcff;
    background: rgba(47, 129, 247, 0.12);
}

main { margin-top: 1rem; }

.panel {
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background: var(--bg-elev);
    box-shadow: var(--shadow-sm);
    padding: 1rem;
}

.page-head {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: end;
    margin-bottom: 0.9rem;
}

.page-head h1 { font-size: clamp(1.4rem, 1.2rem + 0.8vw, 1.95rem); }
.page-sub { color: var(--text-dim); font-size: 0.9rem; }
.muted { color: var(--text-dim); font-size: 0.88rem; }

.notice,
.error,
.app-error {
    border: 1px solid;
    border-radius: var(--radius-md);
    padding: 0.65rem 0.8rem;
    margin-bottom: 0.8rem;
}
.notice {
    border-color: rgba(63, 185, 80, 0.4);
    color: #b5f2be;
    background: rgba(63, 185, 80, 0.09);
}
.error, .app-error {
    border-color: rgba(248, 81, 73, 0.45);
    color: #ffc7c4;
    background: rgba(248, 81, 73, 0.1);
}

input,
select,
textarea {
    width: 100%;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--text);
    padding: 0.62rem 0.72rem;
    transition: border-color 120ms var(--ease), box-shadow 120ms var(--ease), background 120ms var(--ease);
}

input::placeholder, textarea::placeholder { color: #71839b; }
textarea { min-height: 4.5rem; resize: vertical; }

input:hover, select:hover, textarea:hover {
    border-color: #4e5762;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(47, 129, 247, 0.18);
}

.search-form {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0.6rem;
    margin-bottom: 0.9rem;
}

.primary-btn,
.secondary-btn {
    border-radius: var(--radius-sm);
    cursor: pointer;
    padding: 0.58rem 0.82rem;
    transition: border-color 120ms var(--ease), background 120ms var(--ease), color 120ms var(--ease), transform 120ms var(--ease);
}

.primary-btn {
    border: 1px solid #3b82f6;
    background: #2563eb;
    color: #eaf2ff;
    font-weight: 700;
}
.primary-btn:hover { background: #2a6ef0; border-color: #4a8bf9; }
.primary-btn:active { transform: translateY(1px); }

.secondary-btn {
    border: 1px solid var(--line-strong);
    background: var(--surface-soft);
    color: var(--text-soft);
}
.secondary-btn:hover { border-color: #596270; color: var(--text); }
.secondary-btn:active { transform: translateY(1px); }

.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 0.7rem;
}

.book-card {
    display: grid;
    grid-template-columns: 66px 1fr;
    gap: 0.7rem;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--surface-soft);
    padding: 0.72rem;
}

.cover {
    width: 100%;
    aspect-ratio: 2 / 3;
    border-radius: 6px;
    object-fit: cover;
    background: #253041;
}

.book-meta { display: grid; gap: 0.36rem; }

.book-title-btn {
    border: 0;
    background: transparent;
    padding: 0;
    color: var(--text);
    text-align: left;
    cursor: pointer;
    font: 600 1rem/1.25 Fraunces, Georgia, serif;
}
.book-title-btn:hover { color: #c7dcff; }

.status-pill {
    width: fit-content;
    border: 1px solid #365a89;
    border-radius: 999px;
    background: rgba(47, 129, 247, 0.12);
    color: #c7dcff;
    padding: 0.16rem 0.52rem;
    font-size: 0.73rem;
    font-weight: 700;
}

.book-actions { display: flex; gap: 0.45rem; flex-wrap: wrap; }
.stack { display: grid; gap: 0.48rem; }

.library-shell {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 0.75rem;
}

.library-side,
.library-main,
.profile-side,
.profile-main {
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--surface-soft);
    padding: 0.78rem;
}

.library-stat {
    display: flex;
    justify-content: space-between;
    color: var(--text-soft);
    border-bottom: 1px solid var(--line);
    padding: 0.38rem 0;
}

.library-row {
    border-top: 1px solid var(--line);
    margin-top: 0.65rem;
    padding-top: 0.65rem;
    display: grid;
    grid-template-columns: 76px 1fr;
    gap: 0.7rem;
}

.controls-grid {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0.45rem;
    align-items: center;
}

.status-select { position: relative; }
.status-select-trigger {
    width: 100%;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--text-soft);
    padding: 0.56rem 0.62rem;
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    justify-content: space-between;
    cursor: pointer;
}
.status-select-trigger:hover { border-color: #596270; color: var(--text); }
.status-select-icon { width: 1rem; text-align: center; font-weight: 700; }
.status-select-caret { color: var(--text-dim); font-size: 0.76rem; }

.status-select-menu {
    position: absolute;
    top: calc(100% + 0.28rem);
    left: 0;
    right: 0;
    z-index: 30;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-sm);
    background: var(--bg-elev-2);
    padding: 0.28rem;
    box-shadow: var(--shadow-md);
}

.status-select-item {
    width: 100%;
    border: 1px solid transparent;
    border-radius: 7px;
    background: transparent;
    color: var(--text-soft);
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    text-align: left;
    padding: 0.44rem 0.48rem;
    cursor: pointer;
}
.status-select-item:hover {
    background: rgba(255, 255, 255, 0.04);
    border-color: #4d5661;
    color: var(--text);
}
.status-select-item.active {
    border-color: rgba(47, 129, 247, 0.58);
    background: rgba(47, 129, 247, 0.16);
    color: #c7dcff;
}

.status-tone-read { border-color: rgba(63, 185, 80, 0.45); }
.status-tone-reading { border-color: rgba(47, 129, 247, 0.45); }
.status-tone-dnf { border-color: rgba(248, 81, 73, 0.45); }
.status-tone-want { border-color: #4d5661; }

.rating-control {
    display: inline-flex;
    gap: 0.15rem;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-sm);
    background: var(--surface);
    padding: 0.2rem;
}

.star-btn {
    border: 0;
    border-radius: 6px;
    width: 1.7rem;
    height: 1.7rem;
    background: transparent;
    color: #5f6f82;
    font-size: 0.94rem;
    line-height: 1;
    cursor: pointer;
}
.star-btn:hover { color: #a9bbd1; background: rgba(255, 255, 255, 0.04); }
.star-btn.active { color: #f2c94c; }

.toggle-control {
    border: 1px solid var(--line-strong);
    border-radius: 999px;
    background: var(--surface);
    color: var(--text-soft);
    padding: 0.32rem 0.58rem 0.32rem 0.36rem;
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    width: fit-content;
    cursor: pointer;
}
.toggle-control .toggle-knob {
    width: 1.2rem;
    height: 1.2rem;
    border-radius: 999px;
    background: #6b7280;
    transition: transform 120ms var(--ease), background 120ms var(--ease);
}
.toggle-control.on {
    border-color: rgba(47, 129, 247, 0.58);
    background: rgba(47, 129, 247, 0.15);
    color: #c7dcff;
}
.toggle-control.on .toggle-knob {
    background: var(--accent-soft);
    transform: translateX(2px);
}

.book-hero {
    display: grid;
    grid-template-columns: 188px 1fr;
    gap: 0.85rem;
    margin-bottom: 0.85rem;
}

.book-hero img {
    width: 100%;
    border-radius: var(--radius-md);
}

.hero-card,
.review-card,
.list-card {
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--surface-soft);
    padding: 0.78rem;
}

.hero-meta { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: 0.65rem; }
.chip {
    border: 1px solid var(--line-strong);
    border-radius: 999px;
    color: var(--text-soft);
    font-size: 0.8rem;
    padding: 0.28rem 0.55rem;
}

.review-list,
.lists-grid { display: grid; gap: 0.6rem; }

.review-top {
    display: flex;
    justify-content: space-between;
    color: var(--text-soft);
    margin-bottom: 0.3rem;
    font-size: 0.86rem;
}

.list-form {
    display: grid;
    grid-template-columns: 1fr 1fr auto auto;
    gap: 0.5rem;
}

.profile-grid {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 0.75rem;
}

.empty-state,
.loading-state {
    border: 1px dashed var(--line-strong);
    border-radius: var(--radius-md);
    background: var(--surface);
    color: var(--text-dim);
    padding: 0.85rem;
}

.loading-bar {
    margin-top: 0.45rem;
    height: 6px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.04);
    overflow: hidden;
}

.loading-bar span {
    display: block;
    width: 32%;
    height: 100%;
    background: rgba(47, 129, 247, 0.72);
    animation: move 1s infinite var(--ease);
}

.auth-page {
    display: grid;
    place-items: center;
    min-height: 100vh;
    padding: 1rem;
}

.auth-shell { width: min(450px, 100%); }

.auth-card {
    display: grid;
    gap: 0.7rem;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background: var(--bg-elev);
    padding: 1rem;
}

.auth-card h1 { font-size: 1.5rem; }
.auth-card label { display: grid; gap: 0.3rem; color: var(--text-soft); }
.auth-card button {
    border: 1px solid #3b82f6;
    border-radius: var(--radius-sm);
    background: #2563eb;
    color: #eaf2ff;
    padding: 0.58rem 0.82rem;
    font-weight: 700;
    cursor: pointer;
}
.auth-card button:hover { background: #2a6ef0; border-color: #4a8bf9; }

@keyframes move {
    from { transform: translateX(-120%); }
    to { transform: translateX(280%); }
}

@media (max-width: 980px) {
    .library-shell,
    .profile-grid,
    .book-hero {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 760px) {
    .shell { width: calc(100vw - 1rem); margin-top: 0.6rem; }
    .topbar { position: static; grid-template-columns: 1fr; }
    .main-nav, .account { justify-self: start; flex-wrap: wrap; }
    .search-form,
    .list-form,
    .controls-grid {
        grid-template-columns: 1fr;
    }
    .book-grid { grid-template-columns: 1fr; }
}