:root{--color-burgundy: #800000;--color-burgundy-hover: #6B0000;--color-burgundy-light: #A03030;--color-ink: #0F1C2E;--color-ink-light: #3D4F63;--color-ink-muted: #7A8A9E;--color-parchment: #F5F0E8;--color-parchment-warm: #EDE7DB;--color-parchment-deep: #DED5C4;--color-accent: #D4820A;--color-accent-hover: #B86E08;--color-accent-light: rgba(212, 130, 10, .1);--color-accent-wash: #FFF8ED;--color-success: #2E7D4F;--color-success-light: #E4F2EA;--color-warning: #C48B2C;--color-warning-light: #FFF7E6;--color-danger: #C0392B;--color-danger-light: #FDECEB;--color-white: #FFFFFF;--color-overlay: rgba(15, 28, 46, .55);--font-display: "Outfit", sans-serif;--font-body: "DM Sans", -apple-system, BlinkMacSystemFont, sans-serif;--font-mono: "IBM Plex Mono", monospace;--text-xs: .75rem;--text-sm: .875rem;--text-base: 1rem;--text-md: 1.125rem;--text-lg: 1.25rem;--text-xl: 1.5rem;--text-2xl: 2rem;--text-3xl: 2.75rem;--text-4xl: 3.5rem;--leading-tight: 1.15;--leading-snug: 1.3;--leading-normal: 1.5;--leading-relaxed: 1.7;--weight-normal: 400;--weight-medium: 500;--weight-semibold: 600;--weight-bold: 700;--tracking-tight: -.025em;--tracking-normal: 0;--tracking-wide: .06em;--space-3xs: .125rem;--space-2xs: .25rem;--space-xs: .25rem;--space-sm: .5rem;--space-md: .75rem;--space-lg: 1rem;--space-xl: 1.5rem;--space-2xl: 2rem;--space-3xl: 3rem;--space-4xl: 3rem;--radius-xs: .1875rem;--radius-sm: .25rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem;--radius-full: 9999px;--shadow-subtle: 0 2px 8px rgba(0, 0, 0, .06);--shadow-elevated: 0 2px 4px rgba(15, 28, 46, .04), 0 6px 18px rgba(15, 28, 46, .08);--shadow-dramatic: 0 4px 8px rgba(15, 28, 46, .06), 0 12px 36px rgba(15, 28, 46, .12);--shadow-inner: inset 0 2px 4px rgba(15, 28, 46, .05);--transition-fast: .15s ease-out;--transition-smooth: .3s ease-out;--transition-slow: .5s ease-out;--border-thin: 1px;--border-medium: 2px;--border-thick: 3px;--border-color: var(--color-parchment-deep);--border-color-strong: var(--color-ink-muted);--bp-sm: 640px;--bp-md: 768px;--bp-lg: 1024px;--bp-xl: 1280px;--z-base: 0;--z-raised: 10;--z-dropdown: 100;--z-sticky: 200;--z-overlay: 300;--z-modal-backdrop: 350;--z-modal: 400;--z-toast: 500;--content-max-width: 1200px;--content-narrow: 720px;--sidebar-width: 280px;--nav-height: 3.75rem;--bottom-nav-height: 3.5rem;--anim-ease-entrance: cubic-bezier(.22, 1, .36, 1);--anim-ease-exit: ease-out;--anim-duration-instant: 0ms;--anim-duration-fast: .15s;--anim-duration-smooth: .3s;--anim-duration-medium: .5s;--anim-duration-slow: .8s;--anim-stagger-delay: 50ms;--anim-lift-distance: var(--space-2xs);--anim-slide-distance: var(--space-sm);--anim-parallax-factor: .3}[data-theme=dark]{--color-burgundy: #A03030;--color-burgundy-hover: #8A2020;--color-burgundy-light: #C04040;--color-ink: #F5F0E8;--color-ink-light: #B8AFA2;--color-ink-muted: #7A7268;--color-parchment: #0A1220;--color-parchment-warm: #1A2A3E;--color-parchment-deep: #2A3A4E;--color-accent: #D4820A;--color-accent-hover: #F0AA48;--color-accent-light: rgba(212, 130, 10, .12);--color-accent-wash: #1E1810;--color-success: #4ADE80;--color-success-light: #142018;--color-warning: #FBBF24;--color-warning-light: #201A0C;--color-danger: #F87171;--color-danger-light: #201010;--color-white: #1A2A3E;--color-overlay: rgba(0, 0, 0, .65);--shadow-subtle: 0 2px 8px rgba(0, 0, 0, .2);--shadow-elevated: 0 2px 4px rgba(0, 0, 0, .18), 0 6px 18px rgba(0, 0, 0, .25);--shadow-dramatic: 0 4px 8px rgba(0, 0, 0, .22), 0 12px 36px rgba(0, 0, 0, .35);--shadow-inner: inset 0 2px 4px rgba(0, 0, 0, .15);--border-color: var(--color-parchment-deep);--border-color-strong: var(--color-ink-muted)}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html{font-family:var(--font-body);font-size:var(--text-base);line-height:var(--leading-normal);color:var(--color-ink);background-color:var(--color-parchment);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;scroll-behavior:smooth}body{min-height:100vh}a{color:var(--color-accent);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--color-accent-hover)}img{max-width:100%;display:block}button{font:inherit;border:none;background:none;cursor:pointer}input,textarea,select{font:inherit}.text-display{font-family:var(--font-display);font-size:var(--text-3xl);font-weight:var(--weight-bold);line-height:var(--leading-tight);letter-spacing:var(--tracking-tight);color:var(--color-ink)}.text-heading{font-family:var(--font-display);font-size:var(--text-xl);font-weight:var(--weight-semibold);line-height:var(--leading-snug);letter-spacing:var(--tracking-tight);color:var(--color-ink)}.text-subheading{font-family:var(--font-body);font-size:var(--text-md);font-weight:var(--weight-semibold);line-height:var(--leading-normal);color:var(--color-ink)}.text-body{font-family:var(--font-body);font-size:var(--text-base);font-weight:var(--weight-normal);line-height:var(--leading-relaxed);color:var(--color-ink)}.text-caption{font-family:var(--font-body);font-size:var(--text-sm);font-weight:var(--weight-normal);line-height:var(--leading-normal);color:var(--color-ink-light)}.text-label{font-family:var(--font-body);font-size:var(--text-xs);font-weight:var(--weight-semibold);line-height:var(--leading-normal);letter-spacing:var(--tracking-wide);text-transform:uppercase;color:var(--color-ink-muted)}.text-price{font-family:var(--font-mono);font-size:var(--text-xl);font-weight:var(--weight-bold);color:var(--color-accent);line-height:var(--leading-tight)}.surface{background-color:var(--color-white);border:var(--border-thin) solid var(--border-color);border-radius:var(--radius-lg);padding:var(--space-lg)}.surface--elevated{background-color:var(--color-white);border:var(--border-thin) solid var(--border-color);border-radius:var(--radius-lg);padding:var(--space-lg);box-shadow:var(--shadow-elevated)}.surface--inset{background-color:var(--color-parchment-warm);border:var(--border-thin) solid var(--border-color);border-radius:var(--radius-md);padding:var(--space-lg);box-shadow:var(--shadow-inner)}.surface--flat{background-color:var(--color-parchment-warm);border-radius:var(--radius-md);padding:var(--space-md)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-xs);font-family:var(--font-body);font-size:var(--text-sm);font-weight:var(--weight-semibold);line-height:var(--leading-normal);padding:var(--space-xs) var(--space-lg);border-radius:var(--radius-md);border:var(--border-medium) solid transparent;cursor:pointer;transition:all var(--transition-fast);text-decoration:none;white-space:nowrap;color:var(--color-ink);background-color:transparent}.btn:focus-visible{outline:var(--border-medium) solid var(--color-accent);outline-offset:var(--space-3xs)}.btn:disabled{opacity:.5;cursor:not-allowed;pointer-events:none}.input{display:block;width:100%;font-family:var(--font-body);font-size:var(--text-base);font-weight:var(--weight-normal);line-height:var(--leading-normal);padding:var(--space-xs) var(--space-md);min-height:44px;border:var(--border-thin) solid var(--border-color);border-radius:var(--radius-md);background-color:var(--color-white);color:var(--color-ink);transition:border-color var(--transition-fast),box-shadow var(--transition-fast)}.input::placeholder{color:var(--color-ink-muted)}.input:focus{outline:none;border-color:var(--color-accent);box-shadow:0 0 0 var(--space-3xs) var(--color-accent-light)}.textarea{display:block;width:100%;font-family:var(--font-body);font-size:var(--text-base);font-weight:var(--weight-normal);line-height:var(--leading-relaxed);padding:var(--space-sm) var(--space-md);border:var(--border-thin) solid var(--border-color);border-radius:var(--radius-md);background-color:var(--color-white);color:var(--color-ink);resize:vertical;min-height:var(--space-4xl);transition:border-color var(--transition-fast),box-shadow var(--transition-fast)}.textarea:focus{outline:none;border-color:var(--color-accent);box-shadow:0 0 0 var(--space-3xs) var(--color-accent-light)}.select{display:block;width:100%;font-family:var(--font-body);font-size:var(--text-base);font-weight:var(--weight-normal);line-height:var(--leading-normal);padding:var(--space-xs) var(--space-md);padding-right:var(--space-xl);border:var(--border-thin) solid var(--border-color);border-radius:var(--radius-md);background-color:var(--color-white);color:var(--color-ink);-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%237A8A9E' viewBox='0 0 16 16'%3E%3Cpath d='M8 11.5l-5-5h10l-5 5z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right var(--space-sm) center;transition:border-color var(--transition-fast),box-shadow var(--transition-fast)}.select:focus{outline:none;border-color:var(--color-accent);box-shadow:0 0 0 var(--space-3xs) var(--color-accent-light)}.badge{display:inline-flex;align-items:center;gap:var(--space-2xs);font-family:var(--font-body);font-size:var(--text-xs);font-weight:var(--weight-semibold);line-height:var(--leading-normal);padding:var(--space-3xs) var(--space-xs);border-radius:var(--radius-sm);letter-spacing:var(--tracking-wide);text-transform:uppercase;white-space:nowrap}.tag{display:inline-flex;align-items:center;gap:var(--space-2xs);font-family:var(--font-body);font-size:var(--text-xs);font-weight:var(--weight-medium);line-height:var(--leading-normal);padding:var(--space-3xs) var(--space-xs);border-radius:var(--radius-sm);background-color:var(--color-parchment-warm);color:var(--color-ink-light);border:var(--border-thin) solid var(--border-color)}.avatar{display:inline-flex;align-items:center;justify-content:center;width:var(--space-2xl);height:var(--space-2xl);border-radius:var(--radius-full);overflow:hidden;background-color:var(--color-ink);font-family:var(--font-display);font-size:var(--text-sm);font-weight:var(--weight-semibold);color:var(--color-parchment);flex-shrink:0}.avatar img{width:100%;height:100%;object-fit:cover}.divider{border:none;height:var(--border-thin);background-color:var(--border-color);margin:var(--space-lg) 0}.container{width:100%;max-width:var(--content-max-width);margin-left:auto;margin-right:auto;padding-left:var(--space-lg);padding-right:var(--space-lg)}.container--narrow{max-width:var(--content-narrow)}.stack{display:flex;flex-direction:column;gap:var(--space-md)}.stack--xs{gap:var(--space-xs)}.stack--sm{gap:var(--space-sm)}.stack--lg{gap:var(--space-lg)}.stack--xl{gap:var(--space-xl)}.stack--2xl{gap:var(--space-2xl)}.cluster{display:flex;flex-wrap:wrap;align-items:center;gap:var(--space-md)}.cluster--xs{gap:var(--space-xs)}.cluster--sm{gap:var(--space-sm)}.cluster--lg{gap:var(--space-lg)}.grid{display:grid;gap:var(--space-lg);grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}.grid--2{grid-template-columns:repeat(2,1fr)}.grid--3{grid-template-columns:repeat(3,1fr)}.grid--4{grid-template-columns:repeat(4,1fr)}.sidebar-layout{display:grid;gap:var(--space-xl);grid-template-columns:var(--sidebar-width) 1fr}@media (max-width: 768px){.sidebar-layout{grid-template-columns:1fr}}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.sr-only--focusable:focus{position:fixed;top:var(--space-xs);left:var(--space-xs);width:auto;height:auto;padding:var(--space-sm) var(--space-md);margin:0;overflow:visible;clip:auto;white-space:normal;z-index:var(--z-toast);background:var(--color-accent);color:var(--color-parchment);border-radius:var(--radius-md);font-weight:var(--weight-semibold);text-decoration:none}.text--muted{color:var(--color-ink-muted)}.text--light{color:var(--color-ink-light)}.text--accent{color:var(--color-accent)}.text--success{color:var(--color-success)}.text--danger{color:var(--color-danger)}.text--center{text-align:center}.text--right{text-align:right}.text--truncate{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.text--clamp-2{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.btn--primary{background-color:var(--color-burgundy, #800000);color:var(--color-parchment);border-color:var(--color-burgundy, #800000)}.btn--primary:hover{background-color:var(--color-burgundy-hover, #6B0000);border-color:var(--color-burgundy-hover, #6B0000)}.btn--secondary{background-color:var(--color-parchment);color:var(--color-burgundy, #800000);border-color:var(--color-burgundy, #800000)}.btn--secondary:hover{background-color:var(--color-parchment-warm)}.btn--ghost{background-color:transparent;color:var(--color-ink-light);border-color:transparent}.btn--ghost:hover{background-color:var(--color-parchment-warm);color:var(--color-ink)}.btn--accent-ghost{background-color:transparent;color:var(--color-accent);border-color:transparent}.btn--accent-ghost:hover{background-color:var(--color-accent-light)}.btn--outline{background-color:transparent;color:var(--color-ink);border-color:var(--border-color-strong)}.btn--outline:hover{border-color:var(--color-ink);background-color:var(--color-parchment-warm)}.btn--danger{background-color:var(--color-danger);color:var(--color-white);border-color:var(--color-danger)}.btn--danger:hover{opacity:.9}.btn--sm{font-size:var(--text-xs);padding:var(--space-3xs) var(--space-sm);border-radius:var(--radius-sm)}.btn--lg{font-size:var(--text-md);padding:var(--space-sm) var(--space-xl);border-radius:var(--radius-lg)}.btn--icon{padding:var(--space-xs);border-radius:var(--radius-full)}.btn--full{width:100%}.badge--condition-new{background-color:#1b5e38;color:#fff;border:none}.badge--condition-good{background-color:#4caf50;color:#fff;border:none}[data-theme=dark] .badge--condition-good{background-color:#4caf50;color:#fff}.badge--condition-fair{background-color:#f0a500;color:#fff;border:none}[data-theme=dark] .badge--condition-fair{background-color:#f0a500;color:#fff}.badge--condition-poor{background-color:#d32f2f;color:#fff;border:none}.badge--department{background-color:var(--color-parchment-warm);color:var(--color-ink-light);border:var(--border-thin) solid var(--border-color)}.badge--featured{background-color:var(--color-accent);color:var(--color-white)}.badge--sold{background-color:var(--color-ink);color:var(--color-parchment)}.badge--pending{background-color:var(--color-warning-light, #fffbeb);color:var(--color-warning, #d97706);border:var(--border-thin) dashed var(--color-warning, #d97706)}.badge--verified{background-color:var(--color-ink);color:var(--color-parchment);font-size:var(--text-xs);gap:var(--space-2xs)}.surface--interactive{cursor:pointer;transition:transform var(--transition-fast),box-shadow var(--transition-fast)}.surface--interactive:hover{transform:translateY(calc(-1 * var(--space-3xs)));box-shadow:var(--shadow-dramatic)}.surface--interactive:active{transform:translateY(0);box-shadow:var(--shadow-subtle)}.surface--accent-border{border-left:var(--border-thick) solid var(--color-accent)}.surface--compact{padding:var(--space-md)}.surface--spacious{padding:var(--space-xl)}.surface--flush{padding:0}.tag--department{background-color:var(--color-ink);color:var(--color-parchment);border-color:transparent;font-weight:var(--weight-semibold)}.tag--price{background-color:var(--color-accent-wash);color:var(--color-accent);border-color:transparent;font-weight:var(--weight-bold);font-size:var(--text-sm)}.tag--clickable{cursor:pointer;transition:all var(--transition-fast)}.tag--clickable:hover,.tag--active{background-color:var(--color-ink);color:var(--color-parchment);border-color:transparent}.text-heading--serif{font-family:var(--font-display)}.text-heading--sans{font-family:var(--font-body)}.text-heading--sm{font-size:var(--text-lg)}.text-heading--lg{font-size:var(--text-2xl)}.text-heading--xl{font-size:var(--text-3xl)}.text-body--sm{font-size:var(--text-sm)}.text-body--lg,.text-price--sm{font-size:var(--text-md)}.text-price--lg{font-size:var(--text-2xl)}.avatar--sm{width:var(--space-xl);height:var(--space-xl);font-size:var(--text-xs)}.avatar--md{width:var(--space-2xl);height:var(--space-2xl);font-size:var(--text-sm)}.avatar--lg{width:var(--space-3xl);height:var(--space-3xl);font-size:var(--text-xl)}.avatar--xl{width:var(--space-4xl);height:var(--space-4xl);font-size:var(--text-2xl)}.input--sm{font-size:var(--text-sm);padding:var(--space-3xs) var(--space-sm)}.input--lg{font-size:var(--text-md);padding:var(--space-sm) var(--space-lg)}.input--search{padding-left:var(--space-2xl);background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%237A8A9E' viewBox='0 0 16 16'%3E%3Cpath d='M11.742 10.344a6.5 6.5 0 1 0-1.397 1.398h-.001l3.85 3.85a1 1 0 0 0 1.415-1.414l-3.85-3.85zm-5.242.156a5 5 0 1 1 0-10 5 5 0 0 1 0 10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:var(--space-sm) center}@media (max-width: 768px){.grid--2,.grid--3,.grid--4{grid-template-columns:1fr}}@media (min-width: 769px) and (max-width: 1024px){.grid--3,.grid--4{grid-template-columns:repeat(2,1fr)}}.nav-bar{position:sticky;top:0;z-index:var(--z-sticky);background-color:var(--color-burgundy, #800000);border-bottom:none;box-shadow:none;-webkit-backdrop-filter:blur(var(--space-xs));backdrop-filter:blur(var(--space-xs));padding-top:env(safe-area-inset-top,0px)}.nav-bar__inner{display:flex;align-items:center;justify-content:space-between;gap:var(--space-lg);height:var(--nav-height)}.nav-bar__logo{font-family:var(--font-display);font-size:var(--text-xl);font-weight:var(--weight-bold);color:var(--color-parchment);letter-spacing:var(--tracking-tight);text-decoration:none;flex-shrink:0;display:flex;align-items:center;gap:var(--space-xs)}.nav-bar__logo-icon{font-size:var(--text-lg);color:var(--color-parchment)}.nav-bar__search{flex:1;max-width:420px}.nav-bar__actions{display:flex;align-items:center;gap:var(--space-xs);flex-shrink:0}.nav-bar__actions .btn{color:var(--color-parchment)}.nav-bar__actions .btn:hover{color:var(--color-white);background-color:#ffffff1a}.nav-bar .input{background-color:#ffffff1f;border-color:#fff3;color:var(--color-parchment)}.nav-bar .input::placeholder{color:#f5f0e899}.nav-bar .input:focus{background-color:#ffffff2e;border-color:var(--color-accent)}@media (max-width: 768px){.nav-bar__search{display:none}.nav-bar__actions .btn:not(.btn--primary):not(.btn--icon){display:none}}.search-bar{display:flex;align-items:center;gap:var(--space-sm);width:100%;max-width:560px}.search-bar .input{flex:1}.book-card{display:flex;flex-direction:column;overflow:hidden;border-radius:var(--radius-lg);background-color:var(--color-white);border:var(--border-thin) solid var(--border-color);box-shadow:var(--shadow-subtle);cursor:pointer;transition:transform var(--transition-fast),box-shadow var(--transition-fast);text-decoration:none;color:inherit}.book-card:hover{transform:translateY(calc(-1 * var(--space-2xs)));box-shadow:var(--shadow-dramatic)}.book-card__image{position:relative;aspect-ratio:3 / 4;overflow:hidden;background-color:var(--color-parchment-warm)}.book-card__image img{width:100%;height:100%;object-fit:cover;transition:transform var(--transition-smooth)}.book-card:hover .book-card__image img{transform:scale(1.03)}.book-card__badges{position:absolute;bottom:var(--space-sm);left:var(--space-sm);display:flex;flex-direction:column;gap:var(--space-2xs);z-index:2}.book-card__save{position:absolute;top:var(--space-sm);right:var(--space-sm);width:var(--space-xl);height:var(--space-xl);border-radius:var(--radius-full);background-color:var(--color-white);box-shadow:var(--shadow-subtle);display:flex;align-items:center;justify-content:center;border:none;cursor:pointer;transition:all 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