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16px;display:flex;flex-direction:column;gap:14px}.settings-row{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:32px}.settings-row-label{font-size:14px;font-weight:500;color:var(--text);flex-shrink:0}.settings-row-label-group{display:flex;align-items:center;gap:6px;min-width:0;flex:1}.settings-row-control{flex-shrink:0;width:58px;display:flex;justify-content:flex-end;align-items:center}.settings-row--toggle.is-disabled{opacity:.55}.settings-row--toggle.is-disabled .switch{cursor:not-allowed}.settings-info-tip{position:relative;display:inline-flex;flex-shrink:0}.settings-info-btn{width:12px;height:12px;border-radius:50%;border:1px solid var(--text);background:var(--text);color:var(--bg-card);font-size:10px;font-weight:700;font-style:italic;font-family:Georgia,Times New Roman,serif;line-height:1;cursor:pointer;padding:0;display:inline-flex;align-items:center;justify-content:center;transition:transform var(--transition),box-shadow var(--transition),opacity var(--transition)}body.dark .settings-info-btn{background:#f1f5f9;color:#1a1a2e}.settings-info-btn:hover,.settings-info-btn:focus-visible{transform:scale(1.06);box-shadow:0 1px 6px #0000002e;outline:none}.settings-info-callout{position:absolute;top:calc(100% + 10px);right:-4px;width:max-content;min-width:240px;max-width:300px;padding:12px 14px;font-size:14px;font-weight:400;font-style:normal;line-height:1.45;color:var(--text);background:var(--bg-card);border:2px solid color-mix(in srgb,var(--accent) 35%,var(--border));border-radius:var(--radius-sm);box-shadow:var(--shadow-lg);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .15s ease,visibility .15s ease;z-index:20}.settings-info-callout-line{display:block}.settings-info-callout-line+.settings-info-callout-line{margin-top:.5em}.settings-info-callout:before,.settings-info-callout:after{content:"";position:absolute;bottom:100%;right:10px;width:0;height:0;border-left:8px solid transparent;border-right:8px solid transparent;pointer-events:none}.settings-info-callout:before{border-bottom:9px solid color-mix(in srgb,var(--accent) 35%,var(--border))}.settings-info-callout:after{right:11px;border-left-width:7px;border-right-width:7px;border-bottom:8px solid var(--bg-card);margin-bottom:-1px}.settings-info-tip:hover .settings-info-callout,.settings-info-tip:focus-within .settings-info-callout{opacity:1;visibility:visible}.settings-lang-switch{display:inline-flex;align-items:stretch;gap:2px;padding-bottom:2px}.settings-lang-option{position:relative;min-width:28px;padding:4px 4px 6px;border:none;background:transparent;color:var(--text-secondary);font-size:13px;font-weight:700;letter-spacing:.04em;cursor:pointer;transition:color var(--transition)}.settings-lang-option:after{content:"";position:absolute;left:8px;right:8px;bottom:0;height:2px;border-radius:999px;background:transparent;transition:background var(--transition),transform var(--transition);transform:scaleX(.6)}.settings-lang-option:hover{color:var(--text)}.settings-lang-option.is-active{color:var(--accent)}.settings-lang-option.is-active:after{background:var(--accent);transform:scaleX(1)}.settings-theme-toggle{position:relative;display:grid;grid-template-columns:1fr 1fr;align-items:center;flex-shrink:0;width:58px;height:30px;padding:0;border:1px solid var(--border);border-radius:999px;background:color-mix(in srgb,#fbbf24 18%,var(--bg-card));cursor:pointer;transition:background .25s ease,border-color .25s ease,box-shadow .25s ease;overflow:hidden}.settings-theme-toggle.is-dark{background:color-mix(in srgb,var(--accent) 42%,#1e1b4b);border-color:color-mix(in srgb,var(--accent) 50%,var(--border));box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--accent) 25%,transparent)}.settings-theme-toggle:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.settings-theme-slot{display:flex;align-items:center;justify-content:center;z-index:2;height:100%;pointer-events:none}.settings-theme-icon{display:block;width:15px;height:15px;flex-shrink:0;transition:color .25s ease,filter .25s ease}.settings-theme-slot--sun .settings-theme-icon{color:#c2410c;filter:drop-shadow(0 0 1px rgba(255,255,255,.85))}.settings-theme-slot--moon .settings-theme-icon{color:#334155;filter:drop-shadow(0 0 1px rgba(255,255,255,.65))}.settings-theme-toggle.is-dark .settings-theme-slot--sun .settings-theme-icon{color:#fcd34d;filter:drop-shadow(0 0 2px rgba(0,0,0,.45))}.settings-theme-toggle.is-dark .settings-theme-slot--moon .settings-theme-icon{color:#e2e8f0;filter:drop-shadow(0 0 2px rgba(0,0,0,.35))}.settings-theme-toggle.is-light .settings-theme-slot--sun .settings-theme-icon{color:#ea580c}.settings-theme-toggle.is-light .settings-theme-slot--moon .settings-theme-icon{color:#64748b}.settings-theme-thumb{position:absolute;top:3px;left:3px;width:24px;height:24px;border-radius:50%;background:var(--bg-card);box-shadow:0 1px 5px #00000038;transition:transform .25s cubic-bezier(.4,0,.2,1);pointer-events:none;z-index:1}.settings-theme-toggle.is-dark .settings-theme-thumb{transform:translate(28px)}.settings-section{display:flex;flex-direction:column;gap:8px}.settings-section-title{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:var(--text-muted, color-mix(in srgb, var(--text) 65%, transparent))}.settings-section-debug{border-top:1px solid var(--border);padding-top:14px;gap:14px}.settings-section-auth{border-bottom:1px solid var(--border);padding-bottom:14px;margin-bottom:2px}.settings-section-auth .settings-section-title{padding-bottom:2px}.settings-auth-copy{color:var(--text);font-size:12px;line-height:1.5}.settings-auth-providers,.settings-account-actions{display:flex;flex-direction:column;gap:8px}.settings-auth-provider-button{display:inline-flex;align-items:center;justify-content:center;gap:10px;width:100%;min-height:38px;padding:0 14px;border:1px solid var(--border);border-radius:var(--radius-sm);background:color-mix(in srgb,var(--bg-card) 92%,white 8%);color:var(--text);cursor:pointer;font-size:13px;font-weight:600;transition:transform var(--transition),box-shadow var(--transition),border-color var(--transition)}.settings-auth-provider-button:hover{transform:translateY(-1px);border-color:color-mix(in srgb,var(--accent) 45%,var(--border));box-shadow:var(--shadow)}.settings-auth-provider-button:disabled,.settings-account-link:disabled{opacity:.6;cursor:default}.settings-account-card{display:flex;align-items:center;gap:12px}.settings-account-identity{min-width:0;display:flex;flex-direction:column;gap:2px}.settings-account-name,.settings-account-email{overflow:hidden;text-overflow:ellipsis}.settings-account-name{font-size:14px;font-weight:600;color:var(--text);white-space:nowrap}.settings-account-email{font-size:12px;color:var(--text-secondary);word-break:break-word}.settings-account-link{border:none;background:transparent;color:var(--accent);cursor:pointer;font-size:13px;font-weight:600;padding:0;text-align:right}.settings-account-link:hover{color:color-mix(in srgb,var(--accent) 80%,var(--text))}.settings-account-actions{display:flex;justify-content:flex-end}.settings-auth-loading{height:38px;border:1px solid var(--border);border-radius:var(--radius-sm);background:linear-gradient(90deg,transparent 0%,rgba(255,255,255,.18) 50%,transparent 100%),var(--bg-card);background-size:200% 100%,auto;animation:settings-auth-sheen 1.2s infinite linear}.settings-auth-error{padding:8px 10px;border-radius:var(--radius-sm);background:color-mix(in srgb,var(--incorrect) 12%,var(--bg-card));color:var(--incorrect);font-size:12px;line-height:1.35}.settings-row--debug{align-items:baseline}.settings-debug-value{margin-left:16px;color:var(--text-secondary);font-size:12px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;text-align:right;word-break:break-word}@keyframes settings-auth-sheen{0%{background-position:-200% 0,0 0}to{background-position:200% 0,0 0}}.settings-speech-test-link{align-self:flex-start;margin-top:2px;padding:0;border:none;background:transparent;color:var(--accent);font:inherit;font-size:13px;text-decoration:underline;text-underline-offset:2px;cursor:pointer}.settings-speech-test-link:hover{color:color-mix(in srgb,var(--accent) 80%,var(--text))}.settings-speech-test-link:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.speech-test-modal{max-width:640px}.speech-test-title{margin:0;font-size:1.15rem}.speech-test-intro{margin:0 0 20px;font-size:14px;line-height:1.5;color:var(--text-secondary)}.speech-test-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:16px}.speech-test-item{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 14px;border:1px solid var(--border);border-radius:10px;background:color-mix(in srgb,var(--bg-card) 92%,var(--text) 8%)}.speech-test-phrase{flex:1;min-width:0}.speech-test-japanese{display:inline;font-size:20px;line-height:1.6}.speech-test-japanese-part{display:inline;justify-content:flex-start!important}.speech-test-highlight{color:var(--correct)}.speech-test-translation{margin:4px 0 0;font-size:12px;line-height:1.4;color:var(--text-secondary)}.speech-test-actions{display:flex;flex-shrink:0;gap:8px}.speech-test-btn{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;padding:0;border:1px solid var(--border);border-radius:8px;background:var(--bg);color:var(--text);font-size:18px;font-family:inherit;line-height:1;cursor:pointer;transition:background var(--transition),border-color var(--transition)}.speech-test-btn:hover{background:color-mix(in srgb,var(--accent) 12%,var(--bg));border-color:color-mix(in srgb,var(--accent) 40%,var(--border))}.speech-test-btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}@media (max-width: 600px){.app-container{padding:12px}.page-header{margin-bottom:10px}.card{padding:16px}.exercise-container{gap:12px;padding:10px 0}.exercise-question{font-size:22px}.exercise-input{font-size:18px;padding:12px 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.close-btn{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:0;margin:0;border:none;border-radius:0;background:transparent;box-shadow:none;font-size:28px;font-family:inherit;line-height:1;color:var(--text-secondary);cursor:pointer;-webkit-appearance:none;-moz-appearance:none;appearance:none;transition:color var(--transition)}.modal-close-btn:hover,.modal-content>.close-btn:hover,.modal-content .feedback-panel-header .close-btn:hover,.feedback-panel-header .close-btn:hover{color:var(--text);background:transparent}.modal-close-btn:focus-visible,.modal-content>.close-btn:focus-visible,.modal-content .feedback-panel-header .close-btn:focus-visible,.feedback-panel-header .close-btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.sentence-edit-close{position:absolute;top:8px;right:8px}.sentence-edit-title{margin:0 0 8px;font-size:1.25rem}.sentence-edit-modal .sentence-edit-file-hint{margin:0 0 20px;font-size:13px;color:var(--text-secondary)}.sentence-edit-body{display:flex;flex-direction:column;align-items:center;width:100%}.sentence-edit-fields{display:flex;flex-direction:column;align-items:center;gap:14px;width:100%}.sentence-edit-answer-block{width:100%;display:flex;flex-direction:column;align-items:center}.sentence-edit-test-block{width:100%}.sentence-edit-test-block .exercise-input{max-width:none;width:100%}.sentence-edit-textarea{width:100%;max-width:none;box-sizing:border-box;resize:vertical;min-height:2.5em;text-align:center}.sentence-edit-answer{font-family:Noto Sans JP,sans-serif;font-size:22px}.sentence-edit-diff{width:100%;margin-top:16px}.answer-template-validation{margin:6px 0 0;padding-left:1.2em;font-size:13px;color:var(--incorrect)}.answer-template-validation li{margin:2px 0}.sentence-edit-answer-block .answer-template-preview{width:100%}.answer-template-preview{--answer-preview-slot-min-h: 4.5rem;margin-top:8px;padding:14px 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24%,transparent);box-decoration-break:clone;-webkit-box-decoration-break:clone}.answer-template-alt-option{display:inline-flex;align-items:baseline;gap:.2em}.answer-template-alt-sep{color:var(--answer-alt);opacity:.85;font-weight:700;-webkit-user-select:none;user-select:none}.answer-template-alt-group,.answer-template-alt-group ruby,.answer-template-alt-group .answer-template-alt-sep{color:var(--answer-alt)}.answer-template-preview ruby rt{font-size:.55em;color:var(--text-secondary)}.answer-template-alt-group ruby rt{color:color-mix(in srgb,var(--answer-alt) 70%,var(--text-secondary))}.sentence-edit-diff-result{display:flex;justify-content:center;font-size:28px;margin-top:8px}.sentence-edit-error{color:var(--incorrect);font-size:14px;margin:12px 0 0;text-align:center;width:100%}.sentence-edit-actions{display:flex;justify-content:center;gap:10px;margin-top:16px;width:100%}.sentence-edit-actions button{padding:8px 16px;border-radius:8px;font-size:14px;cursor:pointer;border:1px solid var(--border);background:var(--bg);color:var(--text)}.sentence-edit-actions button:disabled{opacity:.5;cursor:not-allowed}.sentence-edit-actions .sentence-edit-save{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--accent, #4a7cff);border-color:transparent;color:#fff}.sentence-edit-actions .sentence-edit-save svg{flex-shrink:0}@keyframes modal-slide-up{0%{transform:translateY(20px) scale(.98);opacity:0}to{transform:translateY(0) scale(1);opacity:1}}.feedback-panel-header{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--border);padding-bottom:16px;margin-bottom:20px}.feedback-panel-header h3{margin:0;font-size:20px;font-weight:700;color:var(--text)}.feedback-panel-form{display:flex;flex-direction:column;gap:16px;flex:1}.feedback-form-group{display:flex;flex-direction:column;gap:6px}.feedback-form-group 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contact-spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@keyframes btn-pop{0%{transform:scale(1)}50%{transform:scale(1.04)}to{transform:scale(1)}}@keyframes btn-shake{0%,to{transform:translate(0)}25%{transform:translate(-4px)}75%{transform:translate(4px)}}.feedback-message{padding:12px 16px;border-radius:8px;font-size:14px;font-weight:500;line-height:1.4}.feedback-message.success{background:color-mix(in srgb,var(--correct) 15%,transparent);border:1px solid var(--correct);color:var(--correct)}.feedback-message.error{background:color-mix(in srgb,var(--incorrect) 15%,transparent);border:1px solid var(--incorrect);color:var(--incorrect)}.diff-test-link{background:none;border:none;color:var(--text-secondary);font-size:12px;text-decoration:underline;padding:4px 0;cursor:pointer;margin-top:4px;align-self:flex-start;transition:color var(--transition)}.diff-test-link:hover{color:var(--accent)}.diff-test-output{width:100%}.copy-as-testcase-row{display:flex;justify-content:flex-end;align-items:center;gap:8px;margin-top:6px}.copy-as-testcase-row .diff-test-link{font-size:11px;padding:0;min-height:0}.copy-as-testcase-feedback{font-size:11px}.copy-as-testcase-feedback.is-copied{color:var(--correct)}.copy-as-testcase-feedback.is-error{color:var(--incorrect)}.feedback-readonly-text{font-size:14px;line-height:1.4;color:var(--text)}.feedback-readonly-block{display:flex;flex-direction:column;gap:2px}.alt-lang-line{font-size:13px;line-height:1.35;color:var(--text-secondary)}.alt-lang-label{font-weight:600}.exercise-question.has-alt-prompt{flex-direction:column;align-items:center;justify-content:center;gap:8px}.exercise-question-main{display:block;width:100%;text-align:center}.exercise-question-alt{display:block;width:100%;margin-top:0;font-size:15px;text-align:center}.feedback-alt-lang{margin-top:4px;font-size:12px}.debug-mode-indicator{position:fixed;bottom:16px;left:16px;z-index:102;display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:6px;background:color-mix(in srgb,var(--bg-card) 85%,transparent);border:1px solid var(--border);box-shadow:0 2px 8px #0000001f;opacity:.55;cursor:pointer;-webkit-user-select:none;user-select:none;transition:opacity var(--transition),transform var(--transition),box-shadow var(--transition)}.debug-mode-indicator:hover,.debug-mode-indicator.is-active{opacity:1;transform:translateY(-1px);box-shadow:var(--shadow-lg)}.debug-mode-indicator-icon{width:14px;height:14px;opacity:.9}.debug-panel-strip{position:fixed;left:16px;right:16px;bottom:56px;z-index:101;display:flex;flex-direction:column;gap:10px;max-width:min(980px,calc(100vw - 32px));padding:12px 14px;border:1px solid var(--border);border-radius:12px;background:color-mix(in srgb,var(--bg-card) 94%,black 6%);box-shadow:var(--shadow-lg);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.debug-panel-strip-header{display:flex;align-items:center;justify-content:space-between;gap:12px}.debug-panel-strip-title{font-size:12px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--text)}.debug-panel-strip-status{font-size:12px;color:var(--text-secondary)}.debug-panel-strip-body{display:grid;grid-template-columns:repeat(auto-fit,minmax(112px,1fr));gap:8px}.debug-panel-metric{display:flex;flex-direction:column;gap:4px;min-width:0;padding:8px 10px;border:1px solid color-mix(in srgb,var(--border) 88%,transparent);border-radius:10px;background:color-mix(in srgb,var(--bg) 82%,transparent)}.debug-panel-metric-label{font-size:10px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--text-muted, color-mix(in srgb, var(--text) 65%, transparent))}.debug-panel-metric-value{min-width:0;color:var(--text);font-size:12px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.debug-panel-strip-error{padding:8px 10px;border-radius:10px;background:color-mix(in srgb,var(--incorrect) 12%,var(--bg-card));color:var(--incorrect);font-size:12px;line-height:1.35}.feedback-text-group{display:flex;flex-direction:column;gap:6px}.feedback-text-group label{font-size:13px;color:var(--text-secondary);font-weight:500}.feedback-section-title{font-size:15px;font-weight:700;color:var(--text);padding-bottom:8px;border-bottom:1px solid var(--border);margin-bottom:4px}@media (max-width: 600px){.debug-mode-indicator{bottom:12px;left:12px}.debug-panel-strip{left:12px;right:12px;bottom:48px;padding:10px 12px}.debug-panel-strip-body{grid-template-columns:repeat(2,minmax(0,1fr))}.feedback-tab{top:auto;bottom:0;right:16px;transform:none;border-radius:8px 8px 0 0;box-shadow:0 -4px 16px #00000026}.feedback-tab:hover{padding-bottom:10px}}.kamehameha-celebration-gif{position:absolute;left:-100px;top:-30px;transform:translateY(-50%);height:250px;z-index:10;pointer-events:none}@media (max-width: 860px){.kamehameha-celebration-gif{left:-5%;width:105%;height:auto}}@media (max-width: 600px){.kamehameha-celebration-gif{top:-20px}}