*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}:root{--washi: #F5F0E8;--washi-dark: #E8E0D2;--washi-deeper: #D9CEBC;--sumi: #2C2C2C;--sumi-light: #5A5A5A;--sumi-faint: #8A8A8A;--hanko: #8B2332;--hanko-glow: #A83242;--ink-wash: rgba(44, 44, 44, .06);--ink-line: rgba(44, 44, 44, .1);--ink-line-dark:rgba(44, 44, 44, .18);--font-serif: "Noto Serif", "Georgia", serif;--sp-xs: 4px;--sp-sm: 8px;--sp-md: 16px;--sp-lg: 24px;--sp-xl: 32px;--sp-2xl: 48px;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-pill: 999px;--shadow-sm: 0 1px 3px rgba(44,44,44,.06);--shadow-md: 0 4px 12px rgba(44,44,44,.08);--shadow-lg: 0 8px 24px rgba(44,44,44,.1);--ease-out: cubic-bezier(.16, 1, .3, 1);--dur-fast: .15s;--dur-med: .25s;--dur-slow: .4s}html,body{height:100%;font-family:var(--font-serif);font-size:15px;line-height:1.65;color:var(--sumi);background:var(--washi);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}#root{height:100%}body:before{content:"";position:fixed;top:0;right:0;bottom:0;left:0;pointer-events:none;z-index:9999;opacity:.025;background-image:radial-gradient(circle at 20% 30%,var(--sumi) .5px,transparent .5px),radial-gradient(circle at 60% 70%,var(--sumi) .3px,transparent .3px),radial-gradient(circle at 80% 20%,var(--sumi) .4px,transparent .4px);background-size:120px 100px,80px 70px,150px 130px}::-webkit-scrollbar{width:5px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--ink-line-dark);border-radius:var(--radius-pill)}.auth-page{display:flex;align-items:center;justify-content:center;min-height:100%;padding:var(--sp-lg)}.auth-card{width:100%;max-width:380px;padding:var(--sp-2xl) var(--sp-xl);background:var(--washi);border:1px solid var(--ink-line);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);animation:fadeUp var(--dur-slow) var(--ease-out)}@keyframes fadeUp{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}.auth-card .hanko-seal{display:flex;align-items:center;justify-content:center;width:72px;height:72px;margin:0 auto var(--sp-lg);font-size:32px;font-weight:700;color:var(--washi);background:var(--hanko);border-radius:var(--radius-md);box-shadow:inset 0 1px 2px #0003,0 2px 8px #8b233240;-webkit-user-select:none;user-select:none;transition:transform var(--dur-med) var(--ease-out)}.auth-card .hanko-seal:hover{transform:scale(1.06) rotate(-2deg)}.auth-card h1{text-align:center;font-size:1.4rem;font-weight:700;margin-bottom:var(--sp-xs);letter-spacing:.03em}.auth-card .subtitle{text-align:center;font-size:.82rem;color:var(--sumi-faint);margin-bottom:var(--sp-xl)}.form-group{margin-bottom:var(--sp-md)}.form-group label{display:block;font-size:.78rem;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--sumi-light);margin-bottom:var(--sp-xs)}.form-group input{width:100%;padding:10px 14px;font-family:var(--font-serif);font-size:.95rem;color:var(--sumi);background:var(--washi-dark);border:1px solid var(--ink-line);border-radius:var(--radius-sm);outline:none;transition:border-color var(--dur-fast),box-shadow var(--dur-fast)}.form-group input:focus{border-color:var(--hanko);box-shadow:0 0 0 3px #8b23321a}.form-group input::placeholder{color:var(--sumi-faint);font-style:italic}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--sp-sm);font-family:var(--font-serif);font-size:.9rem;font-weight:700;letter-spacing:.03em;padding:11px 20px;border:none;border-radius:var(--radius-sm);cursor:pointer;transition:all var(--dur-fast) var(--ease-out);-webkit-user-select:none;user-select:none}.btn-primary{width:100%;color:var(--washi);background:var(--hanko);box-shadow:0 2px 6px #8b233233;margin-top:var(--sp-sm)}.btn-primary:hover:not(:disabled){background:var(--hanko-glow);box-shadow:0 4px 12px #8b23324d;transform:translateY(-1px)}.btn-primary:active:not(:disabled){transform:translateY(0)}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.auth-footer{text-align:center;margin-top:var(--sp-lg);font-size:.82rem;color:var(--sumi-faint)}.auth-footer button{background:none;border:none;color:var(--hanko);font-family:var(--font-serif);font-size:.82rem;font-weight:700;cursor:pointer;text-decoration:underline;text-underline-offset:2px}.auth-footer button:hover{color:var(--hanko-glow)}.auth-error{background:#8b233214;color:var(--hanko);padding:var(--sp-sm) var(--sp-md);border-radius:var(--radius-sm);font-size:.82rem;margin-bottom:var(--sp-md);text-align:center;border:1px solid rgba(139,35,50,.15)}.home{display:flex;height:100%}.sidebar{width:320px;min-width:280px;height:100%;display:flex;flex-direction:column;border-right:1px solid var(--ink-line);background:var(--washi)}.sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:var(--sp-md) var(--sp-lg);border-bottom:1px solid var(--ink-line)}.sidebar-header .logo{display:flex;align-items:center;gap:var(--sp-sm)}.sidebar-header .hanko-mini{width:34px;height:34px;display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:700;color:var(--washi);background:var(--hanko);border-radius:var(--radius-sm);box-shadow:inset 0 1px 1px #00000026}.sidebar-header .brand-text{font-size:1.1rem;font-weight:700;letter-spacing:.04em}.sidebar-actions{display:flex;align-items:center;gap:var(--sp-sm)}.icon-btn{width:34px;height:34px;display:inline-flex;align-items:center;justify-content:center;background:transparent;border:1px solid var(--ink-line);border-radius:var(--radius-sm);cursor:pointer;color:var(--sumi-light);font-size:1rem;transition:all var(--dur-fast) var(--ease-out)}.icon-btn:hover{background:var(--ink-wash);color:var(--sumi);border-color:var(--ink-line-dark)}.conversation-list{flex:1;overflow-y:auto;padding:var(--sp-sm) 0}.conversation-item{display:flex;align-items:center;gap:var(--sp-md);padding:var(--sp-md) var(--sp-lg);cursor:pointer;border-bottom:1px solid var(--ink-wash);transition:background var(--dur-fast);position:relative}.conversation-item:hover{background:var(--ink-wash)}.conversation-item.active{background:var(--washi-dark)}.conv-avatar{width:42px;height:42px;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:.85rem;font-weight:700;color:var(--washi);background:var(--sumi-light);border-radius:50%;letter-spacing:.03em}.conv-info{flex:1;min-width:0}.conv-info .conv-top{display:flex;align-items:baseline;justify-content:space-between;gap:var(--sp-sm)}.conv-name{font-size:.9rem;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.conv-time{font-size:.7rem;color:var(--sumi-faint);flex-shrink:0}.conv-preview{font-size:.78rem;color:var(--sumi-faint);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:2px}.conv-unread-badge{position:absolute;right:var(--sp-lg);top:50%;transform:translateY(-50%);min-width:20px;height:20px;display:flex;align-items:center;justify-content:center;font-size:.65rem;font-weight:700;color:var(--washi);background:var(--hanko);border-radius:var(--radius-pill);padding:0 6px}.main-content{flex:1;display:flex;flex-direction:column;height:100%;min-width:0;background:var(--washi)}.message-header{display:flex;align-items:center;gap:var(--sp-md);padding:var(--sp-md) var(--sp-lg);border-bottom:1px solid var(--ink-line)}.message-header .back-btn{display:none}.message-header .partner-info h2{font-size:1rem;font-weight:700}.message-header .partner-info span{font-size:.75rem;color:var(--sumi-faint)}.message-feed{flex:1;overflow-y:auto;padding:var(--sp-lg);display:flex;flex-direction:column;gap:var(--sp-sm)}.msg-date-divider{text-align:center;font-size:.7rem;color:var(--sumi-faint);padding:var(--sp-md) 0;letter-spacing:.04em}.msg-bubble{max-width:65%;padding:var(--sp-sm) var(--sp-md);border-radius:var(--radius-md);font-size:.9rem;line-height:1.6;word-wrap:break-word;animation:bubbleIn var(--dur-med) var(--ease-out);position:relative}@keyframes bubbleIn{0%{opacity:0;transform:translateY(6px) scale(.97)}to{opacity:1;transform:translateY(0) scale(1)}}.msg-bubble.sent{align-self:flex-end;background:var(--sumi);color:var(--washi);border-bottom-right-radius:3px}.msg-bubble.received{align-self:flex-start;background:var(--washi-dark);color:var(--sumi);border:1px solid var(--ink-line);border-bottom-left-radius:3px}.msg-time{font-size:.65rem;margin-top:3px;opacity:.6}.msg-bubble.sent .msg-time{text-align:right}.msg-bubble.received .msg-time{text-align:left}.compose-area{display:flex;align-items:flex-end;gap:var(--sp-sm);padding:var(--sp-md) var(--sp-lg);border-top:1px solid var(--ink-line);background:var(--washi)}.compose-area textarea{flex:1;font-family:var(--font-serif);font-size:.9rem;color:var(--sumi);background:var(--washi-dark);border:1px solid var(--ink-line);border-radius:var(--radius-md);padding:10px 14px;resize:none;outline:none;min-height:42px;max-height:120px;line-height:1.5;transition:border-color var(--dur-fast)}.compose-area textarea:focus{border-color:var(--hanko)}.compose-area textarea::placeholder{color:var(--sumi-faint);font-style:italic}.send-btn{width:42px;height:42px;flex-shrink:0;display:flex;align-items:center;justify-content:center;background:var(--hanko);color:var(--washi);border:none;border-radius:50%;cursor:pointer;font-size:1.1rem;transition:all var(--dur-fast) var(--ease-out);box-shadow:0 2px 6px #8b233233}.send-btn:hover:not(:disabled){background:var(--hanko-glow);transform:scale(1.05)}.send-btn:disabled{opacity:.4;cursor:not-allowed}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;padding:var(--sp-2xl);text-align:center;animation:fadeUp var(--dur-slow) var(--ease-out)}.empty-state .empty-kanji{font-size:4rem;color:var(--ink-line-dark);margin-bottom:var(--sp-md);-webkit-user-select:none;user-select:none}.empty-state h2{font-size:1.1rem;font-weight:700;margin-bottom:var(--sp-xs)}.empty-state p{font-size:.85rem;color:var(--sumi-faint);max-width:260px}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#2c2c2c4d;display:flex;align-items:center;justify-content:center;z-index:100;animation:fadeIn var(--dur-fast)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.modal{width:90%;max-width:400px;background:var(--washi);border:1px solid var(--ink-line);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:var(--sp-xl);animation:fadeUp var(--dur-med) var(--ease-out)}.modal h2{font-size:1.1rem;font-weight:700;margin-bottom:var(--sp-md)}.modal .search-input{width:100%;padding:10px 14px;font-family:var(--font-serif);font-size:.9rem;color:var(--sumi);background:var(--washi-dark);border:1px solid var(--ink-line);border-radius:var(--radius-sm);outline:none;margin-bottom:var(--sp-md);transition:border-color var(--dur-fast)}.modal .search-input:focus{border-color:var(--hanko)}.user-result{display:flex;align-items:center;gap:var(--sp-md);padding:var(--sp-sm) var(--sp-md);cursor:pointer;border-radius:var(--radius-sm);transition:background var(--dur-fast)}.user-result:hover{background:var(--ink-wash)}.user-result .result-name{font-size:.9rem;font-weight:700}.user-result .result-email{font-size:.75rem;color:var(--sumi-faint)}.modal-actions{display:flex;justify-content:flex-end;margin-top:var(--sp-lg)}.btn-ghost{background:none;border:1px solid var(--ink-line);color:var(--sumi-light);padding:8px 16px}.btn-ghost:hover{background:var(--ink-wash);color:var(--sumi)}.sidebar-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;flex:1;padding:var(--sp-xl);text-align:center;color:var(--sumi-faint);font-size:.85rem}.sidebar-empty .empty-icon{font-size:2rem;margin-bottom:var(--sp-sm);opacity:.4}.spinner{width:20px;height:20px;border:2px solid var(--ink-line);border-top-color:var(--hanko);border-radius:50%;animation:spin .6s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media (max-width: 700px){.sidebar{width:100%}.home.has-active .sidebar{display:none}.home:not(.has-active) .main-content{display:none}.message-header .back-btn{display:inline-flex}}