/* custom properties */

:root {
    --bg-root:        #0d0b09;
    --bg-surface:     #131109;
    --bg-elevated:    #1a1814;
    --bg-card:        #201d18;
    --bg-card-hover:  #262219;
    --bg-card-read:   #1a2019;

    --border-faint:   rgba(255, 245, 225, 0.04);
    --border-subtle:  rgba(255, 245, 225, 0.08);
    --border-medium:  rgba(255, 245, 225, 0.13);
    --border-strong:  rgba(255, 245, 225, 0.2);

    --text-primary:   #ede8df;
    --text-secondary: #968e83;
    --text-muted:     #574f48;
    --text-ghost:     #302b26;

    --gold:           #c8a264;
    --gold-light:     #ddb87a;
    --gold-dim:       #7a6238;
    --gold-bg:        rgba(200, 162, 100, 0.07);
    --gold-border:    rgba(200, 162, 100, 0.22);
    --gold-glow:      rgba(200, 162, 100, 0.14);

    --read-color:     #6abf8c;
    --read-bg:        rgba(106, 191, 140, 0.09);
    --read-border:    rgba(106, 191, 140, 0.22);

    --unread-color:   #c8a264;
    --unread-bg:      rgba(200, 162, 100, 0.08);
    --unread-border:  rgba(200, 162, 100, 0.2);

    --danger-color:   #c07070;
    --danger-bg:      rgba(192, 112, 112, 0.07);
    --danger-border:  rgba(192, 112, 112, 0.2);

    --navbar-bg:      rgba(13, 11, 9, 0.88);
    --dialog-backdrop: rgba(6, 5, 3, 0.82);

    --font-display: 'Cormorant Garamond', Georgia, 'Times New Roman', serif;
    --font-body:    'Crimson Pro', Georgia, serif;

    --s-1:  4px;
    --s-2:  8px;
    --s-3:  12px;
    --s-4:  16px;
    --s-5:  20px;
    --s-6:  24px;
    --s-8:  32px;
    --s-10: 40px;
    --s-12: 48px;
    --s-16: 64px;

    --r-sm: 4px;
    --r-md: 8px;
    --r-lg: 12px;
    --r-xl: 16px;

    --shadow-card:       0 1px 3px rgba(0,0,0,0.45), 0 4px 14px rgba(0,0,0,0.3);
    --shadow-card-hover: 0 4px 12px rgba(0,0,0,0.55), 0 10px 36px rgba(0,0,0,0.4);
    --shadow-dialog:     0 24px 80px rgba(0,0,0,0.75), 0 8px 24px rgba(0,0,0,0.5);

    --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-inout:  cubic-bezier(0.4, 0, 0.2, 1);

    --navbar-h:    62px;
    --container-w: 1280px;
    --pad-x:       var(--s-8);
}

[data-theme="light"] {
    --bg-root:        #f5f0e8;
    --bg-surface:     #ede8de;
    --bg-elevated:    #e8e2d6;
    --bg-card:        #e2dbd0;
    --bg-card-hover:  #ddd6ca;
    --bg-card-read:   #e0ead8;

    --border-faint:   rgba(50, 35, 15, 0.05);
    --border-subtle:  rgba(50, 35, 15, 0.1);
    --border-medium:  rgba(50, 35, 15, 0.16);
    --border-strong:  rgba(50, 35, 15, 0.26);

    --text-primary:   #1a1208;
    --text-secondary: #6b5840;
    --text-muted:     #a89070;
    --text-ghost:     #c8b8a0;

    --gold:           #8b6218;
    --gold-light:     #a67820;
    --gold-dim:       #c8a264;
    --gold-bg:        rgba(139, 98, 24, 0.07);
    --gold-border:    rgba(139, 98, 24, 0.22);
    --gold-glow:      rgba(139, 98, 24, 0.14);

    --read-color:     #2d7a4a;
    --read-bg:        rgba(45, 122, 74, 0.09);
    --read-border:    rgba(45, 122, 74, 0.22);

    --unread-color:   #8b6218;
    --unread-bg:      rgba(139, 98, 24, 0.08);
    --unread-border:  rgba(139, 98, 24, 0.2);

    --danger-color:   #a04040;
    --danger-bg:      rgba(160, 64, 64, 0.07);
    --danger-border:  rgba(160, 64, 64, 0.2);

    --navbar-bg:      rgba(245, 240, 232, 0.9);
    --dialog-backdrop: rgba(100, 85, 65, 0.45);

    --shadow-card:       0 1px 3px rgba(50,35,15,0.1), 0 4px 14px rgba(50,35,15,0.07);
    --shadow-card-hover: 0 4px 12px rgba(50,35,15,0.14), 0 10px 36px rgba(50,35,15,0.1);
    --shadow-dialog:     0 24px 80px rgba(50,35,15,0.22), 0 8px 24px rgba(50,35,15,0.14);
}

/* reset */

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

html {
    font-size: 17px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-root);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100dvh;
    transition: background-color 250ms var(--ease-inout), color 250ms var(--ease-inout);
}

/* layout */

.container {
    width: 100%;
    max-width: var(--container-w);
    margin-inline: auto;
    padding-inline: var(--pad-x);
}

/* navbar */

.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--navbar-h);
    background-color: var(--navbar-bg);
    backdrop-filter: blur(18px) saturate(1.3);
    -webkit-backdrop-filter: blur(18px) saturate(1.3);
    border-bottom: 1px solid var(--border-subtle);
    transition: background-color 250ms var(--ease-inout), border-color 250ms var(--ease-inout);
}

.navbar__inner {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--s-4);
}

.navbar__brand {
    display: flex;
    align-items: baseline;
    gap: var(--s-3);
}

.navbar__logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.025em;
    line-height: 1;
}

.navbar__tagline {
    display: none;
    font-size: 0.6875rem;
    font-weight: 300;
    color: var(--text-muted);
    letter-spacing: 0.07em;
}

@media (min-width: 600px) {
    .navbar__tagline { display: inline; }
}

.navbar__actions {
    display: flex;
    align-items: center;
    gap: var(--s-3);
}

/* theme toggle */

.btn-theme {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--r-md);
    background: transparent;
    border: 1px solid var(--border-medium);
    color: var(--text-secondary);
    cursor: pointer;
    transition:
        background-color 140ms ease,
        color 140ms ease,
        border-color 140ms ease,
        transform 120ms ease;
}

.btn-theme:hover {
    background-color: var(--bg-elevated);
    color: var(--text-primary);
    border-color: var(--border-strong);
}

.btn-theme:active {
    transform: scale(0.92);
}

.btn-theme:focus-visible {
    outline: 2px solid var(--gold-dim);
    outline-offset: 2px;
}

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

/* stats bar */

.stats-bar {
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-subtle);
    padding-block: var(--s-5);
    transition: background-color 250ms var(--ease-inout);
}

.stats-bar__inner {
    display: flex;
    align-items: center;
    gap: var(--s-8);
    flex-wrap: wrap;
}

.stats-bar__counts {
    display: flex;
    align-items: center;
    gap: var(--s-5);
    flex-shrink: 0;
}

.stat {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.stat__value {
    font-size: 1.4375rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1;
    letter-spacing: -0.035em;
    font-variant-numeric: tabular-nums;
}

.stat__value--read {
    color: var(--read-color);
}

.stat__label {
    font-size: 0.6875rem;
    font-weight: 400;
    color: var(--text-muted);
    letter-spacing: 0.07em;
    text-transform: uppercase;
}

.stat-divider {
    width: 1px;
    height: 26px;
    background-color: var(--border-subtle);
    flex-shrink: 0;
}

.stats-bar__progress {
    flex: 1;
    min-width: 200px;
    max-width: 440px;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--s-2);
}

.progress-label {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.progress-pct {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--gold);
    font-variant-numeric: tabular-nums;
}

.progress-track {
    height: 5px;
    background-color: var(--border-faint);
    border-radius: 999px;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--gold-dim) 0%, var(--gold) 65%, var(--gold-light) 100%);
    border-radius: 999px;
    transition: width 600ms var(--ease-spring);
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    right: -1px;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    background: var(--gold-light);
    border-radius: 50%;
    box-shadow: 0 0 5px var(--gold), 0 0 12px rgba(200, 162, 100, 0.5);
}

/* main */

.main-content {
    padding-block: var(--s-8);
}

/* library grid */

.library-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(256px, 1fr));
    gap: var(--s-4);
}

@media (min-width: 1024px) {
    .library-grid {
        grid-template-columns: repeat(auto-fill, minmax(272px, 1fr));
        gap: var(--s-5);
    }
}

/* book card */

.book-card {
    display: flex;
    flex-direction: column;
    background-color: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--r-lg);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    transition:
        transform 220ms var(--ease-spring),
        box-shadow 220ms var(--ease-spring),
        border-color 160ms ease,
        background-color 160ms ease;
}

.book-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-card-hover);
    background-color: var(--bg-card-hover);
    border-color: var(--border-medium);
}

.book-card[data-read="true"] {
    background-color: var(--bg-card-read);
    border-color: var(--read-border);
}

.book-card[data-read="true"]:hover {
    border-color: var(--read-color);
    opacity: 0.95;
}

.book-card__body {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.book-card__content {
    flex: 1;
    padding: var(--s-5) var(--s-5) var(--s-4);
    display: flex;
    flex-direction: column;
    gap: var(--s-2);
}

.book-card__badge {
    display: inline-flex;
    align-items: center;
    align-self: flex-start;
    padding: 2px var(--s-2);
    border-radius: 999px;
    font-size: 0.625rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    border: 1px solid transparent;
    margin-bottom: var(--s-1);
}

.book-card__badge--read {
    color: var(--read-color);
    background-color: var(--read-bg);
    border-color: var(--read-border);
}

.book-card__badge--unread {
    color: var(--unread-color);
    background-color: var(--unread-bg);
    border-color: var(--unread-border);
}

.book-card__title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.3;
    letter-spacing: -0.01em;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-card__author {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    font-style: italic;
    font-weight: 300;
}

.book-card__meta {
    display: flex;
    align-items: center;
    gap: var(--s-1);
    margin-top: auto;
    padding-top: var(--s-3);
}

.book-card__meta-icon {
    color: var(--text-muted);
    flex-shrink: 0;
}

.book-card__pages {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

.book-card__actions {
    display: flex;
    gap: var(--s-2);
    padding: var(--s-3) var(--s-4) var(--s-4);
    border-top: 1px solid var(--border-faint);
}

.book-card__actions .btn {
    flex: 1;
    min-width: 0;
}

/* card animations */

@keyframes card-enter {
    from {
        opacity: 0;
        transform: translateY(18px) scale(0.96);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes card-exit {
    from {
        opacity: 1;
        transform: scale(1);
        max-height: 300px;
    }
    to {
        opacity: 0;
        transform: scale(0.95) translateY(-6px);
        max-height: 0;
    }
}

.book-card-enter {
    animation: card-enter 400ms var(--ease-spring) both;
}

.book-card-exit {
    animation: card-exit 220ms var(--ease-inout) both;
    pointer-events: none;
    overflow: hidden;
}

/* buttons */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--s-2);
    padding: 0 var(--s-4);
    height: 38px;
    border-radius: var(--r-md);
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1;
    white-space: nowrap;
    cursor: pointer;
    border: 1px solid transparent;
    text-decoration: none;
    transition:
        background-color 140ms ease,
        border-color 140ms ease,
        color 140ms ease,
        transform 120ms ease,
        box-shadow 140ms ease;
    user-select: none;
    -webkit-user-select: none;
}

.btn:active {
    transform: scale(0.96);
}

.btn:focus-visible {
    outline: 2px solid var(--gold-dim);
    outline-offset: 2px;
}

.btn--primary {
    background-color: var(--gold);
    color: #17120a;
    border-color: var(--gold);
    font-weight: 600;
    letter-spacing: 0.01em;
}

.btn--primary:hover {
    background-color: var(--gold-light);
    border-color: var(--gold-light);
    box-shadow: 0 0 0 3px var(--gold-glow);
}

.btn--ghost {
    background-color: transparent;
    color: var(--text-secondary);
    border-color: var(--border-medium);
}

.btn--ghost:hover {
    background-color: var(--bg-elevated);
    color: var(--text-primary);
    border-color: var(--border-strong);
}

.btn--danger {
    background-color: transparent;
    color: var(--danger-color);
    border-color: var(--danger-border);
}

.btn--danger:hover {
    background-color: var(--danger-bg);
    border-color: var(--danger-color);
}

.btn--sm {
    height: 30px;
    padding: 0 var(--s-3);
    font-size: 0.75rem;
    border-radius: var(--r-sm);
}

.btn__icon {
    flex-shrink: 0;
}

/* dialog */

.dialog {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100dvh;
    max-width: 100vw;
    max-height: 100dvh;
    margin: 0;
    padding: var(--s-6);
    background: transparent;
    border: none;
    display: none;
}

.dialog[open] {
    display: flex;
    align-items: center;
    justify-content: center;
}

.dialog::backdrop {
    background-color: var(--dialog-backdrop);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.dialog__panel {
    position: relative;
    width: 100%;
    max-width: 520px;
    background-color: var(--bg-elevated);
    border: 1px solid var(--border-medium);
    border-radius: var(--r-xl);
    box-shadow: var(--shadow-dialog);
    overflow: hidden;
    animation: dialog-in 360ms var(--ease-spring) both;
}

@keyframes dialog-in {
    from {
        opacity: 0;
        transform: translateY(22px) scale(0.96);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.dialog__header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: var(--s-6) var(--s-6) var(--s-5);
    border-bottom: 1px solid var(--border-subtle);
}

.dialog__title {
    font-family: var(--font-display);
    font-size: 1.3125rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.dialog__subtitle {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-top: var(--s-1);
    font-weight: 300;
}

.dialog__close-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 30px;
    height: 30px;
    border-radius: var(--r-md);
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition:
        background-color 140ms ease,
        color 140ms ease,
        border-color 140ms ease;
}

.dialog__close-btn:hover {
    background-color: var(--bg-card);
    color: var(--text-primary);
    border-color: var(--border-subtle);
}

.dialog__close-btn:focus-visible {
    outline: 2px solid var(--gold-dim);
    outline-offset: 2px;
}

/* form */

.dialog__form {
    padding: var(--s-6);
    display: flex;
    flex-direction: column;
    gap: var(--s-5);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--s-4);
}

@media (max-width: 480px) {
    .form-row { grid-template-columns: 1fr; }
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--s-2);
}

.form-group--half {
    max-width: 180px;
}

.form-label {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 0.01em;
}

.form-input {
    height: 40px;
    padding: 0 var(--s-3);
    background-color: var(--bg-card);
    border: 1px solid var(--border-medium);
    border-radius: var(--r-md);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.9375rem;
    outline: none;
    width: 100%;
    transition:
        border-color 140ms ease,
        box-shadow 140ms ease,
        background-color 140ms ease;
}

.form-input::placeholder {
    color: var(--text-ghost);
}

.form-input:focus {
    border-color: var(--gold-dim);
    box-shadow: 0 0 0 3px var(--gold-bg);
    background-color: var(--bg-elevated);
}

.form-input[type="number"] {
    -moz-appearance: textfield;
    appearance: textfield;
}

.form-input[type="number"]::-webkit-inner-spin-button,
.form-input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
}

.form-checkbox-label {
    display: inline-flex;
    align-items: center;
    gap: var(--s-3);
    cursor: pointer;
    user-select: none;
    -webkit-user-select: none;
}

.form-checkbox {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
    pointer-events: none;
}

.form-checkbox-custom {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    background-color: var(--bg-card);
    border: 1.5px solid var(--border-medium);
    border-radius: var(--r-sm);
    transition:
        background-color 140ms ease,
        border-color 140ms ease;
}

.form-checkbox-check {
    color: #17120a;
    opacity: 0;
    transition: opacity 140ms ease;
    flex-shrink: 0;
}

.form-checkbox:checked + .form-checkbox-custom {
    background-color: var(--gold);
    border-color: var(--gold);
}

.form-checkbox:checked + .form-checkbox-custom .form-checkbox-check {
    opacity: 1;
}

.form-checkbox:focus-visible + .form-checkbox-custom {
    box-shadow: 0 0 0 3px var(--gold-glow);
}

.form-checkbox-label:hover .form-checkbox-custom {
    border-color: var(--gold-dim);
}

.form-checkbox-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.dialog__actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--s-3);
    padding-top: var(--s-1);
}

/* empty state */

.library-empty {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--s-16) var(--s-8);
    text-align: center;
    gap: var(--s-3);
}

.library-empty__icon {
    width: 52px;
    height: 52px;
    border-radius: var(--r-lg);
    background-color: var(--bg-card);
    border: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    margin-bottom: var(--s-2);
}

.library-empty__title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.library-empty__text {
    font-size: 0.9375rem;
    color: var(--text-muted);
    max-width: 280px;
    line-height: 1.5;
}

.library-empty__hint {
    font-size: 0.8125rem;
    color: var(--text-ghost);
    margin-top: var(--s-1);
}

/* scrollbar */

::-webkit-scrollbar          { width: 6px; }
::-webkit-scrollbar-track    { background: transparent; }
::-webkit-scrollbar-thumb    { background: var(--border-medium); border-radius: 999px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-strong); }

::selection {
    background-color: var(--gold-bg);
    color: var(--text-primary);
}