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var(--space-6);background:var(--accent-primary);color:#fff;font-size:var(--text-base);font-weight:var(--font-semibold);border:none;border-radius:var(--radius-md);cursor:pointer;transition:all var(--duration-fast) var(--ease-default);min-height:44px}.primary-button:hover{background:var(--accent-hover);transform:translateY(-1px)}.primary-button:active{transform:translateY(0)}.secondary-button{width:100%;display:flex;align-items:center;justify-content:center;padding:var(--space-3) var(--space-6);background:transparent;color:var(--text-primary);font-size:var(--text-base);font-weight:var(--font-medium);border:1px solid var(--border-medium);border-radius:var(--radius-md);cursor:pointer;transition:all var(--duration-fast) var(--ease-default);min-height:44px}.secondary-button:hover{background:var(--bg-tertiary);border-color:var(--border-dark)}.secondary-button:active{transform:translateY(0)}.success-button{width:100%;display:flex;align-items:center;justify-content:center;padding:var(--space-3) var(--space-6);background:var(--color-success);color:#fff;font-size:var(--text-base);font-weight:var(--font-semibold);border:none;border-radius:var(--radius-md);cursor:pointer;transition:all var(--duration-fast) var(--ease-default);min-height:44px}.success-button:hover{filter:brightness(1.05);transform:translateY(-1px)}.success-button:active{transform:translateY(0)}.back-button{display:inline-flex;align-items:center;padding:var(--space-2) var(--space-4);background:transparent;color:var(--accent-primary);font-size:var(--text-sm);font-weight:var(--font-medium);border:none;border-radius:var(--radius-md);cursor:pointer;transition:all var(--duration-fast) var(--ease-default)}.back-button:hover{background:var(--accent-light)}.action-button{display:inline-flex;align-items:center;justify-content:center;padding:var(--space-2) var(--space-4);background:var(--bg-primary);color:var(--text-primary);font-size:var(--text-sm);font-weight:var(--font-medium);border:1px solid var(--border-light);border-radius:var(--radius-md);cursor:pointer;transition:all var(--duration-fast) var(--ease-default)}.action-button:hover{border-color:var(--border-medium);background:var(--bg-tertiary)}.action-button.active{background:var(--accent-primary);color:#fff;border-color:var(--accent-primary)}.card-white{background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);overflow:hidden}.mode-card{width:100%;display:flex;align-items:center;gap:var(--space-4);padding:var(--space-5) var(--space-6);background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-lg);cursor:pointer;transition:all var(--duration-normal) var(--ease-default);text-align:left}.mode-card:hover{border-color:var(--border-medium);box-shadow:var(--shadow-md)}.mode-card:active{transform:scale(.99)}.mode-card-icon{width:48px;height:48px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-md);flex-shrink:0}.mode-card-icon svg{width:24px;height:24px}.mode-card-practice .mode-card-icon{background:var(--accent-light);color:var(--accent-primary)}.mode-card-timeattack .mode-card-icon{background:#fd7e141a;color:var(--color-orange)}.mode-card-content{flex:1}.mode-card-title{font-size:var(--text-lg);font-weight:var(--font-semibold);color:var(--text-primary);margin-bottom:var(--space-1)}.mode-card-desc{font-size:var(--text-sm);color:var(--text-secondary)}.menu-button{width:100%;display:flex;align-items:center;justify-content:space-between;padding:var(--space-4) var(--space-5);background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-lg);cursor:pointer;transition:all var(--duration-fast) var(--ease-default)}.menu-button:hover{border-color:var(--border-medium);background:var(--bg-tertiary)}.menu-button-content{text-align:left}.menu-button-title{font-size:var(--text-base);font-weight:var(--font-medium);color:var(--text-primary)}.menu-button-arrow{color:var(--text-tertiary);font-size:var(--text-lg)}.difficulty-card-select{width:100%;display:flex;align-items:center;justify-content:space-between;padding:var(--space-4) var(--space-5);border-radius:var(--radius-lg);background:var(--bg-primary);cursor:pointer;transition:all var(--duration-normal) var(--ease-default);border:1px solid var(--border-light)}.difficulty-card-select:hover{border-color:var(--border-medium)}.difficulty-card-select.active{border-color:var(--accent-primary);background:var(--accent-light)}.difficulty-card-select-time{font-size:var(--text-xl);font-weight:var(--font-semibold);font-variant-numeric:tabular-nums}.difficulty-card-per{font-size:var(--text-xs);font-weight:var(--font-medium);color:var(--text-tertiary)}.difficulty-card-select-title{font-size:var(--text-base);font-weight:var(--font-semibold);color:var(--text-primary)}.difficulty-card-select-easy .difficulty-card-select-time{color:var(--color-success)}.difficulty-card-select-normal .difficulty-card-select-time{color:var(--color-warning)}.difficulty-card-select-hard .difficulty-card-select-time{color:var(--color-error)}.tile-mode-button{flex:1;padding:var(--space-3) var(--space-4);background:var(--bg-primary);color:var(--text-primary);font-size:var(--text-sm);font-weight:var(--font-medium);border:1px solid var(--border-light);border-radius:var(--radius-md);cursor:pointer;transition:all var(--duration-fast) var(--ease-default)}.tile-mode-button:hover{border-color:var(--border-medium)}.tile-mode-button.active{border-color:var(--accent-primary);background:var(--accent-light);color:var(--accent-primary)}.suit-button{padding:var(--space-2) var(--space-3);background:var(--bg-primary);color:var(--text-secondary);font-size:var(--text-sm);font-weight:var(--font-medium);border:1px solid var(--border-light);border-radius:var(--radius-md);cursor:pointer;transition:all var(--duration-fast) var(--ease-default)}.suit-button:hover{border-color:var(--border-medium)}.suit-button.active{background:var(--accent-primary);color:#fff;border-color:var(--accent-primary)}.mode-badge{display:inline-flex;align-items:center;padding:var(--space-1) var(--space-3);background:var(--bg-tertiary);color:var(--text-secondary);font-size:var(--text-xs);font-weight:var(--font-medium);border-radius:var(--radius-md);border:1px solid var(--border-light)}.problem-id-badge{font-size:var(--text-xs);color:var(--text-tertiary)}.time-attack-header{position:sticky;top:0;background:#f8f9faf2;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);z-index:10;padding:var(--space-3) var(--space-4);margin-bottom:var(--space-4);border-bottom:1px solid var(--border-light)}.page-type-label{text-align:center;font-size:var(--text-lg);font-weight:var(--font-bold);color:var(--text-primary);margin-bottom:var(--space-2);letter-spacing:.05em}.time-attack-mode-label{display:flex;justify-content:center;align-items:center;gap:var(--space-2);margin-bottom:var(--space-2)}.time-attack-mode-label .page-type-label{margin-bottom:0}.difficulty-badge{display:inline-flex;align-items:center;padding:var(--space-1) var(--space-3);font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--color-blue);background:#3b82f61a;border-radius:var(--radius-full)}.time-attack-timer{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--space-2)}.time-attack-total{font-size:var(--text-lg);font-weight:var(--font-semibold);color:var(--text-primary);font-variant-numeric:tabular-nums}.time-attack-total span{font-size:var(--text-2xl)}.time-attack-warning{color:var(--color-red)}.time-attack-score{font-size:var(--text-lg);font-weight:var(--font-semibold);color:var(--text-primary);font-variant-numeric:tabular-nums}.question-timer-container{position:relative;height:2.5rem;background:var(--bg-tertiary);border-radius:var(--radius-md);overflow:hidden;border:1px solid var(--border-light)}.question-timer-bar{position:absolute;top:0;left:0;height:100%;background:var(--color-success);transition:width 1s linear,background-color .5s ease;border-radius:var(--radius-md)}.question-timer-text{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-size:var(--text-lg);font-weight:var(--font-semibold);color:var(--text-primary);font-variant-numeric:tabular-nums}.answer-feedback{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;font-size:var(--text-xl);font-weight:var(--font-bold);border-radius:var(--radius-full);animation:feedbackPop .3s var(--ease-spring)}.answer-feedback-correct{background:#40c05726;color:var(--color-success)}.answer-feedback-incorrect{background:#fa525226;color:var(--color-error)}@keyframes feedbackPop{0%{transform:scale(0);opacity:0}50%{transform:scale(1.2)}to{transform:scale(1);opacity:1}}.feedback-overlay{position:fixed;top:0;left:0;right:0;bottom:0;display:flex;align-items:center;justify-content:center;z-index:100;pointer-events:none}.feedback-overlay-icon{font-size:12rem;font-weight:var(--font-bold);line-height:1;animation:feedbackOverlayPop .5s var(--ease-spring);-moz-user-select:none;user-select:none;-webkit-user-select:none;caret-color:transparent}.feedback-overlay-correct{color:var(--color-success);text-shadow:0 0 40px rgba(64,192,87,.5)}.feedback-overlay-incorrect{color:var(--color-error);text-shadow:0 0 40px rgba(250,82,82,.5)}@keyframes feedbackOverlayPop{0%{transform:scale(0);opacity:0}50%{transform:scale(1.1);opacity:1}to{transform:scale(1);opacity:.9}}.countdown-number{font-size:6rem;font-weight:var(--font-bold);color:var(--accent-primary);line-height:1}.result-card{background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-lg);padding:var(--space-8);text-align:center}.result-main{font-size:var(--text-4xl);font-weight:var(--font-bold);margin-bottom:var(--space-2);letter-spacing:-.02em}.result-correct{color:var(--color-success)}.result-divider{color:var(--text-tertiary);margin:0 var(--space-2)}.result-total{color:var(--text-primary)}.result-accuracy{font-size:var(--text-lg);color:var(--text-secondary)}.history-card{background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-lg);padding:var(--space-4)}.result-header{padding:var(--space-5);text-align:center;border-radius:var(--radius-lg) var(--radius-lg) 0 0}.result-header-correct{background:#40c0571a;color:var(--color-success);border-bottom:1px solid rgba(64,192,87,.2)}.result-header-incorrect{background:#fa52521a;color:var(--color-error);border-bottom:1px solid rgba(250,82,82,.2)}.streak-badge{display:inline-flex;align-items:center;padding:var(--space-1) var(--space-3);background:var(--color-warning);color:var(--text-primary);font-size:var(--text-sm);font-weight:var(--font-semibold);border-radius:var(--radius-md)}.tile{height:96px;width:68px;-o-object-fit:contain;object-fit:contain;display:block}.tile-small,.tile-meld{height:76px;width:54px}.tile-large{height:104px;width:74px}.tile-dynamic{width:var(--tile-width, 22px);height:var(--tile-height, 31px);-o-object-fit:contain;object-fit:contain;display:block}.tile-dynamic-meld{width:var(--meld-tile-width, 20px);height:var(--meld-tile-height, 28px);-o-object-fit:contain;object-fit:contain;display:block}.tile-mobile{width:var(--tile-width, calc((100vw - 44px) / 15));height:var(--tile-height, calc((100vw - 44px) / 15 * 1.4))}.tile-meld-mobile{width:var(--meld-tile-width, calc((100vw - 44px) / 18));height:var(--meld-tile-height, calc((100vw - 44px) / 18 * 1.4))}.tile-dora-mobile{width:calc((100vw - 44px) / 18);height:calc((100vw - 44px) / 18 * 1.4);max-width:28px;max-height:39px}.tile-wrapper{display:inline-flex;align-items:flex-end;height:96px;flex-shrink:0}.tile-wrapper-small,.tile-wrapper-meld{height:76px}.tile-wrapper-large{height:104px}.tile-wrapper-dynamic,.tile-wrapper-dynamic-meld{display:inline-flex;align-items:flex-end;height:var(--tile-height, 31px);flex-shrink:0}.tile-wrapper-mobile,.tile-wrapper-meld-mobile{display:inline-flex;align-items:flex-end;height:var(--tile-height, calc((100vw - 44px) / 15 * 1.4));flex-shrink:0}.tile-wrapper-dora-mobile{height:calc((100vw - 44px) / 18 * 1.4);max-height:39px}.tile-wrapper-rotated{display:inline-flex;justify-content:center;align-items:flex-end;width:96px;height:68px;flex-shrink:0;position:relative}.tile-wrapper-rotated .tile,.tile-wrapper-rotated .tile-dynamic{transform:translateY(6px) rotate(-90deg);transform-origin:center center}.tile-wrapper-rotated .tile.tile-dynamic-meld{transform:translateY(4px) rotate(-90deg);transform-origin:center center}.tile-wrapper-rotated.tile-wrapper-small,.tile-wrapper-rotated.tile-wrapper-meld{width:76px;height:65px}.tile-wrapper-rotated.tile-wrapper-large{width:104px;height:89px}.tile-wrapper-rotated.tile-wrapper-dynamic{width:var(--tile-height, 31px);height:var(--tile-height, 31px)}.tile-wrapper-rotated.tile-wrapper-dynamic-meld{width:var(--meld-tile-height, 28px);height:var(--tile-height, 31px)}.tile-wrapper-rotated.tile-wrapper-mobile{width:var(--tile-height, calc((100vw - 44px) / 15 * 1.4));height:var(--tile-height, calc((100vw - 44px) / 15 * 1.4))}.tile-wrapper-rotated.tile-wrapper-meld-mobile{width:var(--meld-tile-height, calc((100vw - 44px) / 18 * 1.4));height:var(--tile-height, calc((100vw - 44px) / 15 * 1.4))}.tile-wrapper-rotated.tile-wrapper-tiny{width:32px;height:32px}.tile-wrapper-rotated .tile.tile-tiny{transform:translateY(3px) rotate(-90deg);transform-origin:center 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12px);overflow:visible;padding-bottom:12px}}.hand-container{display:flex;align-items:flex-end;gap:0px;flex-wrap:nowrap;width:100%;justify-content:flex-start}.hand-meld-gap,.meld-gap{width:calc(var(--tile-width, 22px) * .1);flex-shrink:0}.winning-tile-gap{width:calc(var(--tile-width, 22px) * .15);flex-shrink:0}.winning-tile-container{position:relative;display:inline-flex;align-items:flex-end;flex-shrink:0}.winning-tile-container .tile,.winning-tile-container .tile-dynamic,.winning-tile-container .tile-dynamic-meld{box-shadow:0 0 8px 2px #ffc800b3;border-radius:4px}.winning-tile-label{position:absolute;top:calc(100% + 4px);left:50%;transform:translate(-50%);font-size:10px;font-weight:var(--font-bold);color:var(--color-red);white-space:nowrap}@media (min-width: 768px){.hand-meld-gap,.meld-gap{width:8px}.winning-tile-gap{width:12px}.winning-tile-label{top:calc(100% + 6px);font-size:14px}}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);display:flex;align-items:flex-start;justify-content:center;z-index:50;padding:12px 8px 8px}@media (min-width: 768px){.modal-backdrop{align-items:center;padding-top:var(--space-4)}}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes scaleIn{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}@keyframes bounceOnce{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-10px)}75%{transform:translate(10px)}}.fade-in{animation:fadeIn var(--duration-slow) var(--ease-default) forwards}.animate-fade-in{animation:fadeIn var(--duration-normal) var(--ease-default) forwards}.animate-scale-in{animation:scaleIn var(--duration-normal) var(--ease-spring) forwards}.animate-bounce-once{animation:bounceOnce .6s ease-in-out}.animate-shake{animation:shake .4s ease-in-out}button{transition:all var(--duration-fast) var(--ease-default)}button:active{transform:scale(.98)}button:disabled{opacity:.5;cursor:not-allowed}.glass{background:#ffffffe6;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid var(--border-light);border-radius:var(--radius-lg)}.glass-light{background:var(--bg-secondary);border:1px solid var(--border-light)}.home-hero-bg{display:none}.home-container{position:relative;z-index:1;max-width:640px;margin:0 auto;padding:var(--space-8) var(--space-4) var(--space-8)}@media (min-width: 640px){.home-container{padding:var(--space-12) var(--space-6) var(--space-8)}}.home-header{text-align:center;margin-bottom:var(--space-10)}.home-title{font-size:var(--text-3xl);font-weight:var(--font-bold);color:var(--text-primary);letter-spacing:-.02em;margin-bottom:var(--space-3)}@media (min-width: 640px){.home-title{font-size:var(--text-4xl)}}.home-description{font-size:var(--text-base);color:var(--text-secondary);line-height:1.75}.home-section{margin-bottom:var(--space-8)}.home-section-title{font-size:var(--text-sm);font-weight:var(--font-semibold);color:var(--text-tertiary);margin-bottom:var(--space-3);padding-left:var(--space-1)}.home-list{display:flex;flex-direction:column;gap:var(--space-3)}.home-card{width:100%;display:flex;align-items:center;gap:var(--space-4);padding:var(--space-4) var(--space-5);background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-lg);cursor:pointer;transition:all var(--duration-normal) 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var(--ease-default)}.home-card:hover .home-card-arrow{transform:translate(4px);color:var(--accent-primary)}.home-footer{text-align:center;padding-top:var(--space-8);border-top:1px solid var(--border-light)}.home-copyright{font-size:var(--text-xs);color:var(--text-tertiary)}.chinitsu-header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-3) var(--space-4);background:var(--bg-primary);border-bottom:1px solid var(--border-light)}.chinitsu-back-btn{background:transparent;border:none;color:var(--accent-primary);font-size:var(--text-sm);font-weight:var(--font-medium);cursor:pointer;padding:var(--space-2);border-radius:var(--radius-md)}.chinitsu-back-btn:hover{background:var(--accent-light)}.chinitsu-title{font-size:var(--text-lg);font-weight:var(--font-semibold);color:var(--text-primary)}.chinitsu-problem-id{font-size:var(--text-xs);color:var(--text-tertiary)}.chinitsu-content{max-width:640px;margin:0 auto;padding:var(--space-6) var(--space-4)}.tile-tiny{height:32px;width:23px}.tile-wrapper-tiny{height:32px}.share-button-x{width:100%;display:flex;align-items:center;justify-content:center;gap:var(--space-2);padding:var(--space-3) var(--space-6);background:#212529;color:#fff;font-size:var(--text-base);font-weight:var(--font-semibold);border:none;border-radius:var(--radius-md);cursor:pointer;transition:all var(--duration-fast) var(--ease-default);text-decoration:none;min-height:44px}.share-button-x:hover{background:#343a40;transform:translateY(-1px)}.share-button-x:active{transform:translateY(0)}.wait-calc-display{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-2);max-width:200px;margin:0 auto}.wait-calc-tile{display:flex;align-items:center;justify-content:center;width:40px;height:40px;font-size:var(--text-lg);font-weight:var(--font-bold);border-radius:var(--radius-md);border:1px solid 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var(--duration-fast) var(--ease-default)}.reference-card:hover{border-color:var(--border-medium);background:var(--bg-tertiary)}.reference-card:active{transform:scale(.98)}.reference-icon{width:36px;height:36px;display:flex;align-items:center;justify-content:center;color:var(--text-tertiary)}.reference-icon svg{width:28px;height:28px}.reference-title{font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--text-secondary)}.app-promo-section{margin-bottom:var(--space-10)}.app-promo-card{display:flex;align-items:center;gap:var(--space-4);padding:var(--space-4) var(--space-5);background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-lg);cursor:pointer;transition:all var(--duration-normal) 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var(--duration-fast) var(--ease-default)}.app-promo-card:hover .app-promo-arrow{transform:translate(4px);color:#007aff}.home-footer-v2{text-align:center;padding-top:var(--space-8);border-top:1px solid var(--border-light)}.home-copyright-v2{font-size:var(--text-xs);color:var(--text-tertiary);margin-bottom:var(--space-2)}.home-footer-link{font-size:var(--text-xs);color:var(--text-tertiary);background:none;border:none;cursor:pointer;text-decoration:underline;text-underline-offset:2px}.home-footer-link:hover{color:var(--text-secondary)}.hover\:-translate-y-1:hover{--tw-translate-y: -.25rem;transform:translate(var(--tw-translate-x),var(--tw-translate-y)) rotate(var(--tw-rotate)) skew(var(--tw-skew-x)) skewY(var(--tw-skew-y)) scaleX(var(--tw-scale-x)) scaleY(var(--tw-scale-y))}.hover\:border-accent-primary:hover{--tw-border-opacity: 1;border-color:rgb(82 166 117 / var(--tw-border-opacity, 1))}.hover\:bg-blue-100:hover{--tw-bg-opacity: 1;background-color:rgb(219 234 254 / var(--tw-bg-opacity, 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768px){.md\:left-4{left:1rem}.md\:top-4{top:1rem}.md\:mx-auto{margin-left:auto;margin-right:auto}.md\:mb-2{margin-bottom:.5rem}.md\:mb-3{margin-bottom:.75rem}.md\:mb-4{margin-bottom:1rem}.md\:mb-6{margin-bottom:1.5rem}.md\:mt-6{margin-top:1.5rem}.md\:inline{display:inline}.md\:hidden{display:none}.md\:h-12{height:3rem}.md\:max-h-\[85vh\]{max-height:85vh}.md\:min-h-\[72px\]{min-height:72px}.md\:min-h-\[84px\]{min-height:84px}.md\:w-28{width:7rem}.md\:w-4{width:1rem}.md\:w-full{width:100%}.md\:max-w-4xl{max-width:56rem}.md\:flex-1{flex:1 1 0%}.md\:grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.md\:flex-row{flex-direction:row}.md\:items-start{align-items:flex-start}.md\:justify-end{justify-content:flex-end}.md\:gap-1{gap:.25rem}.md\:gap-3{gap:.75rem}.md\:gap-4{gap:1rem}.md\:gap-5{gap:1.25rem}.md\:gap-6{gap:1.5rem}.md\:space-y-4>:not([hidden])~:not([hidden]){--tw-space-y-reverse: 0;margin-top:calc(1rem * calc(1 - var(--tw-space-y-reverse)));margin-bottom:calc(1rem * 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