:root{scrollbar-gutter:stable;color:#14201c;background:#f6f7f8;font-family:Manrope,PingFang SC,Microsoft YaHei,sans-serif;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;--ink: #14201c;--muted: #66736d;--paper: #fafbfc;--paper-strong: #ffffff;--panel: #fafbfc;--panel-strong: #fafbfc;--control: #eceff1;--control-strong: #e9edef;--button-surface: #ffffff;--field-surface: #ffffff;--note-surface: #fff7d9;--note-ink: #7d704f;--active-bg: color-mix(in srgb, var(--language-accent, #174f43) 9%, #f6f7f8);--active-text: var(--ink);--on-accent: #ffffff;--panel-border: rgba(20, 32, 28, .12);--subtle-border: rgba(20, 32, 28, .1);--mix-base: white;--body-wash-start: rgba(255, 253, 247, .94);--body-wash-end: rgba(244, 241, 232, .96);--body-rule: rgba(20, 32, 28, .035);--line: #dce2e4;--chart-axis-text: #56635d;--chart-grid: rgba(20, 32, 28, .13);--green: #174f43;--gold: #f2b13d;--red: #c74735;--blue: #1f65c7;--purple: #8b5cf6;--teal: #0f766e;--shadow: 0 2px 8px rgb(20 32 28 / 3%);--study-surface: #f6f8f7;--radius-panel: 18px;--radius-control: 10px;--workspace-padding: clamp(24px, 3vw, 40px);--workspace-gap: 24px;--text-body: .82rem;--text-caption: .7rem}:root[data-theme=dark]{color-scheme:dark;color:#e2e8f0;background:#0f121a;--ink: #f8fafc;--muted: #94a3b8;--paper: #181d28;--paper-strong: #1e2433;--panel: rgba(24, 29, 40, .96);--panel-strong: rgba(30, 36, 51, .98);--control: #242c3d;--control-strong: #2e394e;--button-surface: #222938;--field-surface: #171c26;--note-surface: #2c2518;--note-ink: #f5c469;--active-bg: color-mix(in srgb, var(--language-accent, #6d9ff5) 18%, #181d28);--active-text: #f8fafc;--on-accent: #0f121a;--panel-border: rgba(148, 163, 184, .18);--subtle-border: rgba(148, 163, 184, .12);--mix-base: #141822;--body-wash-start: rgba(12, 15, 22, .98);--body-wash-end: rgba(20, 25, 36, .96);--body-rule: rgba(241, 245, 249, .04);--line: #333f52;--chart-axis-text: #b8c5d6;--chart-grid: rgba(184, 197, 214, .18);--green: #8ad4b4;--gold: #e4b650;--red: #ea8b78;--blue: #93baf0;--purple: #c4b0ff;--teal: #5ec4b8;--shadow: none;--study-surface: #1b2330}@property --progress{syntax: "<percentage>"; inherits: true; initial-value: 0%;}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;background:inherit;transition:background .18s ease,color .18s ease}button{font:inherit;cursor:pointer}.app-shell{display:grid;grid-template-columns:212px minmax(0,1fr);gap:32px;align-items:start;width:min(1400px,calc(100% - 48px));min-height:100svh;margin:0 auto;padding:28px 0}.app-content{min-width:0}.celebration-layer{position:fixed;top:0;right:0;bottom:0;left:0;z-index:30;display:grid;place-items:center;pointer-events:none}.celebration-backdrop{position:absolute;top:0;right:0;bottom:0;left:0;z-index:0;background:#14201c57;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);pointer-events:auto;animation:celebration-pop .28s ease-out both}.confetti-field{position:absolute;top:0;right:0;bottom:0;left:0;z-index:1;width:100%;height:100%;pointer-events:none}.completion-card{position:relative;z-index:2;width:min(520px,calc(100% - 32px));padding:0;border:1px solid var(--panel-border);border-radius:var(--radius-panel);color:var(--ink);background:var(--paper-strong);box-shadow:0 28px 75px #14201c47;pointer-events:auto;animation:celebration-pop .32s cubic-bezier(.16,1,.3,1) both}.completion-inner{display:grid;gap:24px;padding:32px;border:0;border-radius:0}.completion-close{position:absolute;top:24px;right:24px;display:grid;place-items:center;width:32px;height:32px;border:1px solid var(--panel-border);border-radius:6px;color:var(--muted);background:var(--button-surface);transition:transform .1s,color .1s,border-color .1s}.completion-close:hover{transform:scale(1.05);color:var(--ink);border-color:#14201c40}.completion-header{display:grid;gap:4px;text-align:left}.completion-header .eyebrow{font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--language-accent, var(--green))}.completion-header h2{margin:0;color:var(--ink);font-family:inherit;font-size:1.3rem;line-height:1.5;font-weight:600;padding-right:20px}.completion-stat-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.completion-stat-card{display:grid;grid-template-columns:auto minmax(0,1fr);grid-template-rows:auto auto;column-gap:8px;align-items:center;min-height:82px;padding:12px;border:1px solid var(--subtle-border);border-radius:var(--radius-control);background:var(--panel)}.completion-stat-card svg{grid-row:1 / -1;color:var(--muted);stroke-width:1.7;width:17px;height:17px}.completion-stat-card strong{min-width:0;color:var(--ink);font-size:1.3rem;line-height:1;font-weight:600}.completion-stat-card span{min-width:0;color:var(--muted);font-size:.66rem;font-weight:500;letter-spacing:0;text-transform:none}.completion-actions{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:4px}.completion-actions button{display:inline-flex;gap:8px;align-items:center;justify-content:center;min-height:44px;padding:0 16px;border:1px solid transparent;border-radius:8px;font-size:.86rem;font-weight:700;cursor:pointer;transition:transform .1s ease,background-color .16s,border-color .16s}.completion-actions button:active{transform:scale(.97)}.completion-primary{color:var(--on-accent);background:var(--language-accent)}.completion-primary:hover{background:color-mix(in srgb,var(--active-bg) 90%,black)}.completion-secondary{color:var(--ink);background:var(--paper-strong);border-color:var(--panel-border)!important}.completion-secondary:hover{background:color-mix(in srgb,var(--control-strong) 92%,black);border-color:#14201c40!important}@keyframes celebration-pop{0%{opacity:0;transform:translateY(10px) scale(.96)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes timer-pulse{0%,to{transform:scale(1);opacity:.4}50%{transform:scale(1.15);opacity:0}}.timer-ring-btn{cursor:pointer;position:relative;width:40px;height:40px;padding:0;border:none;border-radius:50%;background:transparent;display:inline-flex;align-items:center;justify-content:center;outline:none;flex-shrink:0;transition:transform .1s ease,background-color .2s}.timer-ring-btn:hover{background:var(--panel-border)!important}.timer-ring-btn:active{transform:scale(.9)}.timer-ring-svg{position:absolute;top:0;left:0;transform:rotate(-90deg)}.timer-ring-progress{transition:stroke-dashoffset .3s ease,stroke .3s ease}.timer-ring-progress[data-ticking=true]{transition:stroke-dashoffset 1s linear,stroke .3s ease}.timer-ring-icon{position:relative;z-index:1;transition:color .2s,opacity 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transparent;border-radius:8px;color:var(--muted);background:transparent;font-size:.81rem;font-weight:500}.tab-button[data-active=true]{border-color:transparent;color:var(--ink);background:var(--active-bg);box-shadow:none}.language-select-wrapper{display:none}.language-select{appearance:none;-webkit-appearance:none;-moz-appearance:none;min-height:40px;min-width:120px;padding:0 36px 0 16px;font-size:.88rem;font-weight:600;color:var(--ink);background-color:var(--button-surface);border:1px solid var(--subtle-border);border-radius:8px;cursor:pointer;font-family:inherit;outline:none;transition:border-color .16s ease,box-shadow .16s ease;background-image:url("data:image/svg+xml;charset=UTF-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%2366736d' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;background-size:14px}:root[data-theme=dark] .language-select{background-image:url("data:image/svg+xml;charset=UTF-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E")}.language-select:focus,.language-select:hover{border-color:var(--language-accent, var(--green))}.view-switch{display:grid;grid-template-columns:1fr;align-content:start;gap:5px;padding:0;border:0;background:transparent}.view-button{display:inline-flex;gap:11px;align-items:center;justify-content:flex-start;min-height:44px;padding:0 12px;border:1px solid transparent;color:var(--muted);background:transparent;font-size:.84rem;font-weight:600;white-space:nowrap}.view-button[data-active=true]{color:var(--ink);border-color:var(--panel-border);background:var(--paper-strong);box-shadow:0 2px 4px #14201c08}.view-button[data-active=true] svg{color:var(--language-accent, var(--green));stroke-width:2.4}.nav-footer{display:flex;align-items:center;justify-content:space-between;gap:8px;align-self:end;margin-top:auto}.feedback-link{border-radius:8px;text-decoration:none}.feedback-link:focus-visible{outline:2px solid var(--language-accent, var(--green));outline-offset:3px}.theme-toggle{align-self:end;justify-self:start;display:grid;place-items:center;width:36px;height:36px;margin-top:auto;border:1px solid var(--subtle-border);border-radius:999px;color:var(--muted);background:var(--button-surface);cursor:pointer;transition:color .16s ease,background .16s ease,border-color .16s ease,transform .16s ease}.theme-toggle:hover{color:var(--ink);border-color:var(--language-accent, var(--green));transform:translateY(-1px)}.mobile-status,.mobile-menu-button,.mobile-menu-panel{display:none}.mobile-status strong,.mobile-status span,.mobile-menu-section>span{display:block}.session-bar{display:grid;grid-template-columns:minmax(0,max-content) auto;gap:12px;align-items:center;justify-content:space-between;margin-top:0;padding:0 0 20px;border:0;border-radius:0;background:transparent;box-shadow:none}.segmented-control{display:flex;gap:4px;padding:4px;border:1px solid var(--panel-border);border-radius:10px;background:var(--control)}.session-bar .segmented-control{min-width:0;overflow-x:auto;scrollbar-width:none}.session-bar .segmented-control::-webkit-scrollbar{display:none}.segment-button{flex:1 0 auto;min-height:36px;padding:0 14px;color:var(--muted);background:transparent;font-size:.78rem;font-weight:600;white-space:nowrap}.segment-button[data-active=true]{color:var(--ink);background:var(--paper-strong);box-shadow:0 1px 4px #14201c14}.reset-button{display:grid;place-items:center;width:38px;height:38px;min-height:38px;padding:0;border:1px solid var(--panel-border);color:var(--muted);background:var(--paper-strong);border-radius:10px}.reset-button-text{display:none}.practice-layout{display:grid;grid-template-columns:minmax(0,1fr) 268px;gap:24px;margin-top:0;align-items:stretch}.wordbook-layout{display:grid;grid-template-columns:minmax(230px,280px) minmax(0,1fr);gap:var(--workspace-gap);margin-top:0;align-items:stretch;min-height:min(720px,calc(100vh - 112px))}.verb-list-panel,.conjugation-panel{padding:clamp(16px,3vw,24px)}.verb-list-panel{position:sticky;top:12px;display:grid;grid-template-rows:auto auto auto minmax(0,1fr);gap:12px;contain:size;min-height:max(520px,min(720px,calc(100vh - 112px)));overflow:hidden}.wordbook-heading{display:flex;gap:12px;align-items:center;justify-content:space-between}.workspace-title{color:var(--ink);font-family:Manrope,PingFang SC,Microsoft YaHei,sans-serif;font-size:1.3rem;line-height:1.5;font-weight:600;letter-spacing:-.025em}.wordbook-heading h1{margin:4px 0 0}.wordbook-heading>span{display:inline-flex;flex:0 0 auto;align-items:center;min-height:24px;padding:0 9px;border-radius:5px;color:var(--muted);background:var(--control);font-size:var(--text-caption);font-weight:500}.conjugation-head p{margin:0;color:var(--muted);font-weight:400;font-size:.85rem}.wordbook-search{display:grid;grid-template-columns:auto minmax(0,1fr);gap:8px;align-items:center;min-height:40px;padding:0 11px;border:1px solid var(--panel-border);border-radius:var(--radius-control);color:var(--muted);background:var(--field-surface)}.wordbook-search:focus-within{border-color:var(--language-accent, var(--green));box-shadow:0 0 0 3px color-mix(in srgb,var(--language-accent, var(--green)) 13%,transparent)}.wordbook-search input{width:100%;min-width:0;border:0;outline:0;color:var(--ink);background:transparent;font:inherit;font-size:var(--text-body);font-weight:400}.wordbook-search input::placeholder{color:color-mix(in srgb,var(--muted) 74%,var(--mix-base))}.wordbook-sort{display:grid;grid-template-columns:1fr 1fr;gap:4px;padding:4px;border:1px solid var(--panel-border);border-radius:var(--radius-control);background:var(--control)}.wordbook-sort button{display:inline-flex;gap:6px;align-items:center;justify-content:center;min-height:34px;border:1px solid transparent;border-radius:6px;color:var(--muted);background:transparent;font:inherit;font-size:.76rem;font-weight:600;cursor:pointer;transition:border-color .16s ease,color .16s ease,background .16s ease}.wordbook-sort button:hover{color:var(--ink)}.wordbook-sort button[data-active=true]{border-color:var(--panel-border);color:var(--ink);background:var(--button-surface)}.wordbook-sort button[data-active=true] svg{color:var(--language-accent, var(--green))}.verb-list{display:grid;align-content:start;gap:4px;min-height:0;padding:2px 5px 2px 0;overflow-y:auto;scrollbar-color:var(--control-strong) transparent;scrollbar-width:thin}.verb-list-item{display:grid;grid-template-columns:minmax(0,1fr);gap:3px;align-items:center;min-height:56px;padding:10px 12px;border:1px solid var(--panel-border);color:var(--ink);background:transparent;text-align:left;border-color:transparent;border-radius:var(--radius-control)}.verb-list-item:hover{transform:none;border-color:var(--subtle-border);background:var(--control)}.verb-list-item[data-active=true]{border-color:var(--panel-border);background:var(--paper-strong);box-shadow:0 2px 4px #14201c08}.verb-list-item strong,.verb-list-item span{display:block}.verb-list-item strong{min-width:0;overflow:hidden;font-size:.9rem;font-weight:600;text-overflow:ellipsis;white-space:nowrap}.verb-list-item>span{min-width:0;overflow:hidden;color:var(--muted);font-size:var(--text-caption);font-weight:400;text-overflow:ellipsis;white-space:nowrap}.conjugation-panel{position:sticky;top:28px;min-height:560px;background:var(--paper-strong)}.conjugation-head{display:grid;grid-template-columns:minmax(0,1fr);gap:18px;align-items:start}.conjugation-head h2{margin:8px 0 12px;max-width:100%;overflow-wrap:anywhere;color:var(--ink);font-family:Lora,serif;font-size:clamp(2rem,4vw,3.3rem);line-height:1.2;letter-spacing:0;font-weight:500}.book-tense-tabs{display:flex;flex-wrap:wrap;min-width:0;gap:4px;padding:4px;border:1px solid var(--panel-border);border-radius:var(--radius-control);background:var(--control)}.book-tense-button{flex:1 1 auto;min-width:0;max-width:100%;min-height:42px;padding:8px 12px;color:var(--muted);background:transparent;font-size:.78rem;font-weight:600;overflow-wrap:anywhere;border-radius:8px}.book-tense-button[data-active=true]{color:var(--ink);background:var(--paper-strong);box-shadow:0 1px 4px #14201c14}.conjugation-table{display:grid;gap:0;margin-top:24px}.conjugation-row{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1fr);gap:12px;align-items:center;min-height:64px;padding:14px 4px;border:0;border-radius:0;background:transparent;border-bottom:1px solid var(--subtle-border)}.conjugation-row span{display:inline-flex;align-items:center;width:fit-content;max-width:100%;min-height:34px;padding:0;border-radius:0;overflow-wrap:anywhere;color:var(--muted);background:transparent;font-size:.9rem;line-height:1.5;font-weight:400}.conjugation-row strong{min-width:0;overflow-wrap:anywhere;color:var(--ink);font-size:clamp(1.1rem,2vw,1.35rem);font-weight:600;line-height:1.5}.trainer-panel{container:trainer-panel / inline-size;min-height:660px;padding:var(--workspace-padding);border-radius:var(--radius-panel);background:var(--paper-strong);box-shadow:0 6px 24px #14201c0a}.trainer-head{display:flex;gap:14px;align-items:center;justify-content:space-between}.eyebrow{color:var(--language-accent, var(--green));font-size:.72rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase}.trainer-head h1{margin:8px 0 0}.prompt-card{display:grid;position:relative;overflow:hidden;margin-top:28px;padding:22px 24px 30px;min-height:230px;border:1px solid var(--subtle-border);border-radius:12px;background:var(--study-surface);box-shadow:none}.timer-progress-bar{position:absolute;top:0;left:0;height:4px;background:var(--language-accent, var(--green));transition:width 1s linear,background-color .2s ease;z-index:10}.timer-progress-bar[data-alert=true]{background:var(--red)}.prompt-main-stack{display:grid;grid-template-columns:1fr;gap:30px;width:100%}.prompt-context-row{display:flex;justify-content:space-between;align-items:center;width:100%}.prompt-meta-tags{display:flex;gap:7px;align-items:center}.mixed-mode-tag{background:var(--gold)!important;color:#111!important}.prompt-main{display:grid;grid-template-columns:minmax(0,1fr) minmax(220px,.72fr);gap:18px 22px;align-items:center;min-width:0}.prompt-main.prompt-main-stack{grid-template-columns:minmax(0,1fr)}.prompt-context{grid-column:1 / -1;display:flex;flex-wrap:wrap;gap:7px}.prompt-context span{display:inline-flex;align-items:center;min-height:24px;padding:0 8px;border-radius:5px;color:var(--muted);background:transparent;font-size:.67rem;font-weight:600}.tense-badge{border:1px solid rgba(255,255,255,.15);color:#fff!important}.tense-badge[data-tense=conditional]{color:#111!important}:root[data-theme=dark] .tense-badge{color:#0f121a!important}.prompt-stem{display:grid;align-content:center;gap:4px;min-width:0;min-height:142px}.prompt-stem span{color:var(--muted);font-size:.76rem;font-weight:700;text-transform:uppercase}.prompt-display{display:flex;flex-wrap:wrap;gap:12px 18px;align-items:baseline;margin:8px 0 0}.prompt-subject{display:inline-flex;gap:18px;align-items:baseline;max-width:100%}.prompt-pronoun{font-family:Lora,serif;font-size:clamp(2rem,4vw,3.3rem);font-weight:400;color:var(--ink);line-height:1.2;white-space:nowrap}.prompt-divider{font-family:Lora,serif;font-size:2rem;font-weight:400;color:var(--muted);opacity:.35;line-height:1}.prompt-verb-block{display:grid;min-width:0;max-width:100%;gap:5px}.prompt-infinitive{min-width:0;font-family:Lora,serif;font-size:clamp(2rem,4vw,3.3rem);font-weight:500;color:var(--language-accent, var(--green));line-height:1.2;white-space:nowrap}.prompt-display[data-density=compact] .prompt-pronoun,.prompt-display[data-density=compact] 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