.card{background:var(--color-surface-elevated);border-radius:var(--radius-md);transition:all var(--transition-base)}.card--default{border:1px solid var(--color-border);box-shadow:var(--shadow-sm)}.card--elevated{border:1px solid var(--color-border);box-shadow:var(--shadow-md)}.card--flat{border:1px solid var(--color-border)}.card--ghost{border:none;box-shadow:none}.card--default:hover,.card--elevated:hover,.card--flat:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}.card--padding-none{padding:0}.card--padding-sm{padding:var(--space-3)}.card--padding-default{padding:var(--space-4)}.card--padding-lg{padding:var(--space-6)}.card__header{padding-bottom:var(--space-4);border-bottom:1px solid var(--color-divider);margin-bottom:var(--space-4)}.card__footer{padding-top:var(--space-4);margin-top:var(--space-4);border-top:1px solid var(--color-divider)}.card__title{margin:0;font-size:var(--text-lg);font-weight:var(--font-semibold);color:var(--color-text-primary);line-height:var(--leading-tight)}.card__meta{display:flex;align-items:center;gap:var(--space-2);font-size:var(--text-sm);color:var(--color-text-secondary);margin-top:var(--space-2)}.card__meta>*{display:flex;align-items:center;gap:var(--space-1)}.card__meta>*:not(:last-child):after{content:"•";margin-left:var(--space-2);color:var(--color-text-tertiary)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);font-family:var(--font-sans);font-weight:var(--font-medium);line-height:var(--leading-none);text-decoration:none;white-space:nowrap;border:none;border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);position:relative;overflow:hidden}.btn:focus{outline:2px solid var(--color-primary-400);outline-offset:2px}.btn--sm{padding:var(--space-2) var(--space-3);font-size:var(--text-sm);min-height:32px}.btn--md{padding:var(--space-3) var(--space-4);font-size:var(--text-base);min-height:40px}.btn--lg{padding:var(--space-4) var(--space-6);font-size:var(--text-lg);min-height:48px}.btn--full-width{width:100%}.btn--primary{background:var(--color-primary-500);color:#fff}.btn--primary:hover:not(:disabled){background:var(--color-primary-600);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn--primary:active:not(:disabled){background:var(--color-primary-700);transform:translateY(0)}.btn--secondary{background:var(--color-neutral-100);color:var(--color-text-primary)}.btn--secondary:hover:not(:disabled){background:var(--color-neutral-200);transform:translateY(-1px);box-shadow:var(--shadow-sm)}.btn--secondary:active:not(:disabled){background:var(--color-neutral-300);transform:translateY(0)}.btn--accent{background:var(--color-accent-500);color:#fff}.btn--accent:hover:not(:disabled){background:var(--color-accent-600);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn--accent:active:not(:disabled){background:var(--color-accent-700);transform:translateY(0)}.btn--ghost{background:transparent;color:var(--color-text-primary)}.btn--ghost:hover:not(:disabled){background:var(--color-neutral-100)}.btn--ghost:active:not(:disabled){background:var(--color-neutral-200)}.btn--danger{background:var(--color-error);color:#fff}.btn--danger:hover:not(:disabled){background:#b91c1c;transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn--danger:active:not(:disabled){background:#991b1b;transform:translateY(0)}.btn:disabled,.btn--disabled{opacity:.5;cursor:not-allowed;transform:none!important}.btn--loading{pointer-events:none}.btn--loading .btn__content{opacity:.7}.btn__spinner{display:inline-block;width:16px;height:16px;border:2px solid currentColor;border-right-color:transparent;border-radius:var(--radius-full);animation:btn-spin .6s linear infinite}@keyframes btn-spin{to{transform:rotate(360deg)}}.btn-group{display:inline-flex;gap:var(--space-2)}.btn-group .btn{flex:0 1 auto}@media (max-width: 768px){.btn--sm{min-height:40px;padding:var(--space-2) var(--space-3)}.btn--md{min-height:44px}}.chip{display:inline-flex;align-items:center;gap:var(--space-1);font-family:var(--font-sans);font-weight:var(--font-medium);border-radius:var(--radius-full);transition:all var(--transition-fast)}.chip--sm{padding:var(--space-1) var(--space-2);font-size:var(--text-xs);height:20px}.chip--md{padding:var(--space-1) var(--space-3);font-size:var(--text-sm);height:24px}.chip--lg{padding:var(--space-2) var(--space-4);font-size:var(--text-base);height:32px}.chip--default{background:var(--color-neutral-100);color:var(--color-text-secondary);border:1px solid var(--color-border)}.chip--primary{background:var(--color-primary-50);color:var(--color-primary-700);border:1px solid var(--color-primary-200)}.chip--accent{background:var(--color-accent-50);color:var(--color-accent-700);border:1px solid var(--color-accent-200)}.chip--success{background:#d1fae5;color:#065f46;border:1px solid #6ee7b7}.chip--warning{background:#fef3c7;color:#92400e;border:1px solid #fde68a}.chip--error{background:#fee2e2;color:#991b1b;border:1px solid #fecaca}.chip__label{line-height:1}.chip--removable{padding-right:var(--space-1)}.chip__remove{display:flex;align-items:center;justify-content:center;width:16px;height:16px;padding:0;margin:0;background:transparent;border:none;border-radius:var(--radius-full);color:currentColor;cursor:pointer;font-size:18px;line-height:1;transition:background-color var(--transition-fast)}.chip__remove:hover{background:#0000001a}.chip__remove:focus{outline:2px solid currentColor;outline-offset:1px}.input-wrapper{display:flex;flex-direction:column;gap:var(--space-2)}.input-wrapper--full-width{width:100%}.input__label{font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--color-text-primary)}.input{width:100%;padding:var(--space-3) var(--space-4);font-family:var(--font-sans);font-size:var(--text-base);color:var(--color-text-primary);background:var(--color-surface-elevated);border:1px solid var(--color-border);border-radius:var(--radius-md);transition:all var(--transition-fast)}.input:focus{outline:none;border-color:var(--color-primary-500);box-shadow:0 0 0 3px var(--color-primary-50)}.input::placeholder{color:var(--color-text-tertiary)}.input:disabled{opacity:.5;cursor:not-allowed;background:var(--color-neutral-50)}.input--textarea{min-height:100px;resize:vertical;font-family:var(--font-sans);line-height:var(--leading-normal)}.input--select{-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' viewBox='0 0 12 12'%3E%3Cpath fill='%2357534e' d='M6 9L1 4h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right var(--space-3) center;padding-right:var(--space-8);cursor:pointer}.input-wrapper--error .input{border-color:var(--color-error)}.input-wrapper--error .input:focus{box-shadow:0 0 0 3px #dc26261a}.input__error{font-size:var(--text-sm);color:var(--color-error)}.input__helper{font-size:var(--text-sm);color:var(--color-text-secondary)}:root[data-app-theme=dark] .input--select{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23d6d3d1' d='M6 9L1 4h10z'/%3E%3C/svg%3E")}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:var(--space-12) var(--space-6);min-height:400px}.empty-state__icon{font-size:4rem;margin-bottom:var(--space-4);opacity:.8}.empty-state__title{margin:0;font-size:var(--text-2xl);font-weight:var(--font-semibold);color:var(--color-text-primary);margin-bottom:var(--space-2)}.empty-state__description{margin:0;font-size:var(--text-base);color:var(--color-text-secondary);max-width:480px;line-height:var(--leading-relaxed);margin-bottom:var(--space-6)}.empty-state__action{margin-top:var(--space-4)}.skeleton{background:linear-gradient(90deg,var(--color-neutral-100) 0%,var(--color-neutral-200) 50%,var(--color-neutral-100) 100%);background-size:200% 100%;animation:skeleton-loading 1.5s ease-in-out infinite;border-radius:var(--radius-base)}@keyframes skeleton-loading{0%{background-position:200% 0}to{background-position:-200% 0}}.skeleton--text{height:1em;margin-bottom:var(--space-2)}.skeleton--circle{border-radius:var(--radius-full);width:40px;height:40px}.skeleton--rectangular{width:100%;height:200px}.skeleton--pill{border-radius:var(--radius-full);height:24px}.skeleton-card{padding:var(--space-4);background:var(--color-surface-elevated);border:1px solid var(--color-border);border-radius:var(--radius-md);margin-bottom:var(--space-4)}.skeleton-card__meta{display:flex;gap:var(--space-3);margin-top:var(--space-3)}.skeleton-card__tags{display:flex;gap:var(--space-2);margin-top:var(--space-3)}.skeleton-list{display:flex;flex-direction:column;gap:var(--space-4)}:root[data-app-theme=dark] .skeleton{background:linear-gradient(90deg,var(--color-neutral-700) 0%,var(--color-neutral-600) 50%,var(--color-neutral-700) 100%)}.page-header{display:flex;align-items:center;justify-content:space-between;gap:var(--space-6);padding:var(--space-6) 0;margin-bottom:var(--space-6);border-bottom:1px solid var(--color-divider)}.page-header__content{display:flex;flex-direction:column;gap:var(--space-2);flex:1;min-width:0}.page-header__back{display:inline-flex;align-items:center;gap:var(--space-2);padding:var(--space-2) 0;font-family:var(--font-sans);font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--color-primary-600);background:none;border:none;cursor:pointer;transition:color var(--transition-fast);margin-bottom:var(--space-2)}.page-header__back:hover{color:var(--color-primary-700)}.page-header__text{display:flex;flex-direction:column;gap:var(--space-1)}.page-header__title{margin:0;font-size:var(--text-3xl);font-weight:var(--font-bold);color:var(--color-text-primary);line-height:var(--leading-tight)}.page-header__subtitle{margin:0;font-size:var(--text-base);color:var(--color-text-secondary);line-height:var(--leading-normal)}.page-header__action{flex-shrink:0}@media (max-width: 640px){.page-header{flex-direction:column;align-items:flex-start}.page-header__title{font-size:var(--text-2xl)}}.dropdown-menu{position:relative;display:inline-block}.dropdown-menu__trigger{cursor:pointer;display:inline-flex;align-items:center}.dropdown-menu__content{position:absolute;right:0;top:calc(100% + 4px);background:var(--color-surface-elevated);border:1px solid var(--color-border);border-radius:8px;box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -1px #0000000f;min-width:180px;padding:4px 0;z-index:1000;animation:dropdown-fade-in .15s ease-out}@keyframes dropdown-fade-in{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.dropdown-menu__item{width:100%;padding:8px 12px;text-align:left;background:none;border:none;cursor:pointer;font-size:14px;color:var(--color-text-primary);display:flex;align-items:center;gap:8px;transition:background-color .15s ease}.dropdown-menu__item:hover{background-color:var(--color-neutral-100)}.dropdown-menu__item--danger{color:var(--color-error)}.dropdown-menu__item--danger:hover{background-color:var(--color-warning-50)}.dropdown-menu__separator{height:1px;background-color:var(--color-border);margin:4px 0}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background-color:#00000080;display:flex;align-items:center;justify-content:center;z-index:9999;animation:modal-fade-in .2s ease-out}@keyframes modal-fade-in{0%{opacity:0}to{opacity:1}}.modal-content{background:var(--color-surface-elevated);border-radius:12px;max-width:500px;width:90%;max-height:90vh;overflow-y:auto;box-shadow:0 20px 25px -5px #0000001a,0 10px 10px -5px #0000000a;animation:modal-slide-up .2s ease-out}@keyframes modal-slide-up{0%{transform:scale(.95);opacity:0}to{transform:scale(1);opacity:1}}.modal-title{font-size:1.25rem;font-weight:600;padding:1.5rem 1.5rem 0;margin:0;color:var(--color-text-primary)}.modal-body{padding:1.5rem}.modal-actions{padding:0 1.5rem 1.5rem;display:flex;gap:.75rem;justify-content:flex-end}.keyboard-shortcuts-help{padding:1rem}.shortcuts-section{margin-bottom:2rem}.shortcuts-section:last-of-type{margin-bottom:1rem}.shortcuts-section-header{display:flex;align-items:center;gap:.5rem;margin-bottom:1rem;padding-bottom:.5rem;border-bottom:2px solid var(--border)}.shortcuts-section-header h3{font-size:1rem;font-weight:600;color:var(--text-primary);margin:0}.shortcuts-list{display:grid;gap:.75rem}.shortcut-item{display:flex;align-items:center;gap:1rem}kbd.key{display:inline-flex;align-items:center;justify-content:center;min-width:2rem;padding:.25rem .5rem;font-family:var(--font-mono);font-size:.75rem;font-weight:600;color:var(--text-primary);background:var(--card-bg);border:2px solid var(--border);border-radius:.25rem;box-shadow:0 2px 0 var(--border)}.shortcut-item .description{flex:1;font-size:.875rem;color:var(--text-secondary)}.shortcuts-footer{padding-top:1rem;border-top:1px solid var(--border);text-align:center}.shortcuts-footer p{margin:0}.shortcuts-footer kbd.key{margin:0 .25rem}:root[data-app-theme=dark] kbd.key{background:var(--color-surface);border-color:var(--color-border);box-shadow:0 2px 0 var(--color-border)}[data-theme=sepia] kbd.key{background:#f0e8d4;border-color:#d7c9b0;box-shadow:0 2px #d7c9b0}@media (max-width: 640px){.shortcuts-list{gap:.5rem}.shortcut-item{gap:.75rem}kbd.key{min-width:1.75rem;font-size:.7rem}.shortcut-item .description{font-size:.8rem}}@media print{.keyboard-shortcuts-help{background:var(--color-surface-elevated)!important}kbd.key{border:1px solid var(--color-border);box-shadow:none}}.appshell{min-height:100vh;display:flex;flex-direction:column;background:var(--color-surface)}.appshell-topbar{display:flex;align-items:center;justify-content:space-between;height:48px;padding:0 var(--space-4);padding-top:env(safe-area-inset-top,0px);background:var(--color-surface-elevated);border-bottom:1px solid var(--color-border);position:sticky;top:0;z-index:var(--z-sticky)}.appshell-topbar__left{display:flex;align-items:center}.appshell-topbar__logo{color:var(--color-primary-600);font-size:var(--text-xl);font-weight:var(--font-bold);text-decoration:none}.appshell-topbar__logo:hover{text-decoration:none}.appshell-topbar__right{display:flex;align-items:center;gap:var(--space-2)}.appshell-topbar__theme-toggle{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border:none;background:transparent;cursor:pointer;color:var(--color-text-secondary);border-radius:var(--radius-md);transition:background .15s ease,color .15s ease}.appshell-topbar__theme-toggle:hover{background:var(--color-neutral-100);color:var(--color-primary-600)}.appshell-topbar__hamburger{display:none}.appshell-body{display:flex;flex:1;min-height:0}.appshell-sidebar{width:240px;flex-shrink:0;background:var(--color-surface-elevated);border-right:1px solid var(--color-border);display:flex;flex-direction:column;overflow-y:auto;position:sticky;top:48px;height:calc(100vh - 48px)}.appshell-sidebar__main{flex:1;padding:var(--space-2) 0}.appshell-sidebar__section{margin-bottom:var(--space-1)}.appshell-sidebar__section-label{text-transform:uppercase;font-size:var(--text-xs);font-weight:var(--font-semibold);letter-spacing:.05em;color:var(--color-text-tertiary);padding:var(--space-6) var(--space-4) var(--space-2) var(--space-4)}.appshell-nav-item{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-2) var(--space-4);margin:0 var(--space-2);border-radius:var(--radius-md);font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--color-text-primary);text-decoration:none;transition:background .15s ease,color .15s ease;border-left:3px solid transparent}.appshell-nav-item__icon{color:var(--color-text-tertiary);flex-shrink:0;transition:color .15s ease}.appshell-nav-item:hover{background:var(--color-neutral-100);text-decoration:none}.appshell-nav-item:hover .appshell-nav-item__icon{color:var(--color-primary-600)}.appshell-nav-item--active{background:var(--color-primary-50);color:var(--color-primary-700);font-weight:var(--font-semibold);border-left-color:var(--color-primary-600)}.appshell-nav-item--active .appshell-nav-item__icon{color:var(--color-primary-600)}.appshell-nav-item--upgrade{color:var(--color-primary-600);font-weight:var(--font-semibold)}.appshell-nav-item--upgrade .appshell-nav-item__icon{color:var(--color-primary-600)}.appshell-sidebar__bottom{margin-top:auto;padding:var(--space-2) 0 var(--space-4);border-top:1px solid var(--color-border)}.appshell-content{flex:1;min-width:0;overflow-y:auto}.mobile-nav-drawer{display:none}@media (max-width: 768px){.appshell-sidebar{display:none}.appshell-topbar__hamburger{display:flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;background:none;border:none;color:var(--color-text-primary);border-radius:var(--radius-md);cursor:pointer;transition:background var(--transition-fast)}.appshell-topbar__hamburger:hover{background:var(--color-neutral-100)}.mobile-nav-drawer{display:block;position:fixed;top:0;right:0;bottom:0;left:0;z-index:var(--z-modal)}.mobile-nav-overlay{position:absolute;top:0;right:0;bottom:0;left:0;background:#0006}.mobile-nav-links{position:absolute;top:0;right:0;bottom:0;width:min(280px,85vw);background:var(--color-surface-elevated);padding:var(--space-6) var(--space-4);padding-top:calc(var(--space-6) + env(safe-area-inset-top,0px));padding-bottom:calc(var(--space-4) + env(safe-area-inset-bottom,0px));display:flex;flex-direction:column;gap:var(--space-1);overflow-y:auto;z-index:1;box-shadow:var(--shadow-xl)}.mobile-nav-link{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-3) var(--space-4);min-height:48px;border-radius:var(--radius-md);color:var(--color-text-primary);font-weight:var(--font-medium);font-size:var(--text-base);text-decoration:none;transition:background var(--transition-fast);background:none;border:none;cursor:pointer;font-family:inherit;width:100%;text-align:left}.mobile-nav-link:hover,.mobile-nav-link:active{background:var(--color-neutral-100);color:var(--color-primary-600)}.mobile-nav-link--active{background:var(--color-primary-50);color:var(--color-primary-700);font-weight:var(--font-semibold)}.mobile-nav-link--upgrade{color:var(--color-primary-600);font-weight:var(--font-semibold);margin-top:auto}.mobile-nav-link--logout{color:var(--color-text-secondary);border-top:1px solid var(--color-border);margin-top:var(--space-2);padding-top:var(--space-4)}}:root{--lv-bg: #f2eee5;--lv-ink: #192833;--lv-muted: #4d5f6b;--lv-surface: #fffdf8;--lv-surface-strong: #f8f1e2;--lv-border: #d5cab7;--lv-brand: #0e7f75;--lv-brand-strong: #0a625c;--lv-note: #f6e4b7;--lv-accent: #af7f27;--lv-nav-bg: rgba(242, 238, 229, .9);--lv-shadow: 0 18px 42px rgba(23, 37, 45, .1)}:root[data-app-theme=dark]{--lv-bg: #1d1a15;--lv-ink: #f5f5f4;--lv-muted: #d6d3d1;--lv-surface: #2b261f;--lv-surface-strong: #332c24;--lv-border: #514739;--lv-brand: #5eead4;--lv-brand-strong: #2dd4bf;--lv-note: #594719;--lv-accent: #cfac61;--lv-nav-bg: rgba(29, 26, 21, .9);--lv-shadow: 0 18px 42px rgba(0, 0, 0, .28)}:root[data-app-theme=dark] .chapter{background:linear-gradient(180deg,#2b261feb,#2b261ff5)}:root[data-app-theme=dark] .chapter:before{background:linear-gradient(90deg,transparent 0,rgba(94,234,212,.28) 50%,transparent 100%)}:root[data-app-theme=dark] 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