:root{--bg-gradient-start: #e8e8e8;--bg-gradient-end: #d0d0d0;--card-bg: #ffffff;--section-bg: #f8f8f8;--item-bg: #ffffff;--text-primary: #2a2a2a;--text-secondary: #6b6b6b;--primary-color: #4a4a4a;--accent-gradient-start: #6a6a6a;--accent-gradient-end: #4a4a4a;--border-color: #d4d4d4;--shadow-color: rgba(0, 0, 0, .08);--shadow-hover: rgba(0, 0, 0, .12);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .08);--shadow-md: 0 4px 8px rgba(0, 0, 0, .1);--shadow-lg: 0 8px 16px rgba(0, 0, 0, .12);--shadow-xl: 0 12px 24px rgba(0, 0, 0, .15);--input-bg: #ffffff;--input-border: #d4d4d4;--input-focus: #5a5a5a;--overlay-lightest: rgba(0, 0, 0, .05);--overlay-lighter: rgba(0, 0, 0, .08);--overlay-light: rgba(0, 0, 0, .1);--overlay-medium: rgba(0, 0, 0, .2);--overlay-strong: rgba(0, 0, 0, .3);--overlay-heavy: rgba(0, 0, 0, .5);--overlay-intense: rgba(0, 0, 0, .7);--overlay-opaque: rgba(0, 0, 0, .9);--highlight-subtle: rgba(255, 255, 255, .05);--highlight-soft: rgba(255, 255, 255, .1);--highlight-medium: rgba(255, 255, 255, .2);--highlight-strong: rgba(255, 255, 255, .3);--radius-xs: .125rem;--radius-sm: .25rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem;--radius-2xl: 1.5rem;--radius-full: 50%;--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-base: .25s cubic-bezier(.4, 0, .2, 1);--transition-slow: .35s cubic-bezier(.4, 0, .2, 1);--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--danger-color: #e74c3c;--danger-hover: #c0392b;--success-color: #27ae60;--warning-color: #faa61a;--info-color: #3498db;--accent-blue: #0071eb;--accent-green: #43b581;--rarity-ur: #e91e8c;--rarity-ur-light: #ffb3d9;--rarity-ur-bg: linear-gradient(135deg, #fdeebb, #ffc8b2, #ffb7c5, #dcb5ff, #fdeebb);--rarity-ur-text: #4a0028;--rarity-ssr: #ffd54f;--rarity-ssr-text: #5d4037;--rarity-sr: #ba68c8;--rarity-sr-text: #ffffff;--rarity-r: #6495ed;--rarity-r-text: #ffffff;--rarity-n: #b0bec5;--rarity-n-text: #37474f;--primary-alpha-10: rgba(0, 113, 235, .1);--primary-alpha-15: rgba(0, 113, 235, .15);--primary-alpha-20: rgba(0, 113, 235, .2);--primary-alpha-30: rgba(0, 113, 235, .3);--island-stamina: #3498db;--island-points: #9b59b6;--island-success: #2ecc71;--surface-card: #ffffff;--surface-elevated: #f5f5f5;--surface-border: #e0e0e0;--text-on-surface: #4a4a4a}body.dark-mode{--bg-gradient-start: #1a1a1a;--bg-gradient-end: #0a0a0a;--card-bg: #2a2a2a;--section-bg: #1f1f1f;--item-bg: #2a2a2a;--text-primary: #e8e8e8;--text-secondary: #a8a8a8;--primary-color: #c0c0c0;--accent-gradient-start: #5a5a5a;--accent-gradient-end: #3a3a3a;--border-color: #3a3a3a;--shadow-color: rgba(0, 0, 0, .4);--shadow-hover: rgba(0, 0, 0, .6);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .3);--shadow-md: 0 4px 8px rgba(0, 0, 0, .4);--shadow-lg: 0 8px 16px rgba(0, 0, 0, .5);--shadow-xl: 0 12px 24px rgba(0, 0, 0, .6);--input-bg: #1f1f1f;--input-border: #3a3a3a;--input-focus: #6a6a6a;--danger-color: #e74c3c;--danger-hover: #c0392b;--success-color: #27ae60;--warning-color: #faa61a;--info-color: #3498db;--accent-blue: #7289da;--accent-green: #43b581;--rarity-ur: #e91e8c;--rarity-ur-light: #ffb3d9;--rarity-ur-bg: linear-gradient(135deg, #fdeebb, #ffc8b2, #ffb7c5, #dcb5ff, #fdeebb);--rarity-ur-text: #4a0028;--rarity-ssr: #ffd54f;--rarity-ssr-text: #5d4037;--rarity-sr: #ba68c8;--rarity-sr-text: #ffffff;--rarity-r: #6495ed;--rarity-r-text: #ffffff;--rarity-n: #b0bec5;--rarity-n-text: #37474f;--primary-alpha-10: rgba(114, 137, 218, .1);--primary-alpha-15: rgba(114, 137, 218, .15);--primary-alpha-20: rgba(114, 137, 218, .2);--primary-alpha-30: rgba(114, 137, 218, .3);--island-stamina: #3498db;--island-points: #9b59b6;--island-success: #2ecc71;--surface-card: #2f3136;--surface-elevated: #3d4148;--surface-border: #4f545c;--text-on-surface: #b9bbbe}@keyframes shake{10%,90%{transform:translate3d(-1px,0,0)}20%,80%{transform:translate3d(2px,0,0)}30%,50%,70%{transform:translate3d(-4px,0,0)}40%,60%{transform:translate3d(4px,0,0)}}:root{--val-accent: #d14d6a;--val-accent-hover: #b8405a;--val-accent-light: rgba(209, 77, 106, .1)}body.dark-mode{--val-accent: #e8587a;--val-accent-hover: #d14467;--val-accent-light: rgba(232, 88, 122, .15)}.valentine-container{display:grid;grid-template-columns:320px 1fr;gap:var(--spacing-lg);max-width:75rem;margin:auto;padding:var(--spacing-lg);min-height:70vh;color:var(--text-secondary)}.shipgirl-panel{background:var(--bg-secondary);border-radius:var(--radius-lg);border:1px solid var(--border-color);overflow:hidden;display:flex;flex-direction:column;max-height:calc(100vh - 250px)}.search-box{padding:var(--spacing-md);background:var(--bg-tertiary);border-bottom:1px solid var(--border-color)}.search-box input{width:100%;padding:var(--spacing-sm) var(--spacing-md);border:2px solid var(--border-color);border-radius:var(--radius-md);background-color:var(--card-bg);color:var(--text-primary);font-size:1rem;transition:all var(--transition-fast);box-sizing:border-box;outline:none}body.dark-mode .search-box input{background-color:var(--bg-input)}.search-box input::placeholder{color:var(--text-dim)}.search-box input:focus{border-color:var(--val-accent);box-shadow:0 0 0 3px #d14d6a1a}body.dark-mode .search-box input:focus{box-shadow:0 0 0 3px #e8587a33}.shipgirl-count{display:flex;justify-content:flex-end;padding:var(--spacing-xs) var(--spacing-md);font-size:.875rem;color:var(--text-muted);background:var(--bg-tertiary);border-bottom:1px solid var(--border-color)}.shipgirl-list{flex:1;overflow-y:auto;padding:var(--spacing-sm);display:flex;flex-direction:column;gap:2px}.shipgirl-list::-webkit-scrollbar{width:6px}.shipgirl-list::-webkit-scrollbar-track{background:transparent}.shipgirl-list::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:3px}.shipgirl-item{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);border:2px solid transparent}.shipgirl-item:hover{background:var(--section-bg);border-color:var(--primary-color);transform:translate(4px)}.shipgirl-item.active{background:#d14d6a14;border-color:var(--val-accent)}body.dark-mode .shipgirl-item:hover{background:var(--bg-input)}body.dark-mode .shipgirl-item.active{background:var(--val-accent-light)}.shipgirl-item-icon{width:36px;height:36px;border-radius:50%;object-fit:cover;background:var(--bg-tertiary);flex-shrink:0}.shipgirl-item-placeholder{width:36px;height:36px;border-radius:50%;background:var(--bg-tertiary);display:flex;align-items:center;justify-content:center;font-size:.875rem;font-weight:600;color:var(--text-dim);flex-shrink:0}.shipgirl-item-name{font-size:.9375rem;font-weight:500;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;line-height:1.3}.letter-panel{background:var(--bg-secondary);border-radius:var(--radius-lg);border:1px solid var(--border-color);overflow:hidden;display:flex;flex-direction:column;min-width:0}.letter-header{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md) var(--spacing-lg);background:var(--bg-tertiary);border-bottom:1px solid var(--border-color)}.letter-header-icon{width:48px;height:48px;border-radius:50%;object-fit:cover;background:var(--bg-elevated);flex-shrink:0;border:2px solid var(--border-color)}.letter-header-placeholder{width:48px;height:48px;border-radius:50%;background:var(--bg-elevated);display:flex;align-items:center;justify-content:center;font-size:1.25rem;color:var(--text-dim);flex-shrink:0;border:2px solid var(--border-color)}.letter-header-name{font-size:1.25rem;font-weight:600;color:var(--text-primary)}.year-tabs{display:flex;flex-wrap:wrap;gap:var(--spacing-xs);padding:var(--spacing-sm) var(--spacing-lg);background:var(--bg-secondary);border-bottom:1px solid var(--border-color)}.year-tab{padding:.5rem 1rem;border-radius:var(--radius-sm);border:none;background:var(--bg-elevated);color:var(--text-muted);font-size:.875rem;font-weight:600;cursor:pointer;transition:all var(--transition-fast)}.year-tab:hover{color:var(--text-primary);background:var(--bg-input)}.year-tab.active{background:var(--val-accent);color:#fff}.letter-content-wrapper{flex:1;overflow-y:auto;padding:var(--spacing-lg);background:var(--section-bg)}body.dark-mode .letter-content-wrapper{background:var(--bg-tertiary)}.letter-content-wrapper::-webkit-scrollbar{width:6px}.letter-content-wrapper::-webkit-scrollbar-track{background:transparent}.letter-content-wrapper::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:3px}.letter-card{background:var(--card-bg);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--spacing-xl) var(--spacing-xl) var(--spacing-lg);box-shadow:var(--shadow-md);position:relative;max-width:640px;margin:0 auto}body.dark-mode .letter-card{background:var(--bg-secondary)}.letter-card:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--val-accent),var(--primary-color));border-radius:var(--radius-lg) var(--radius-lg) 0 0}.letter-year-label{display:inline-block;font-size:.8125rem;font-weight:700;color:var(--val-accent);background:var(--val-accent-light);padding:.2rem .6rem;border-radius:var(--radius-sm);margin-bottom:var(--spacing-md);letter-spacing:.03em}.letter-text{line-height:2;font-size:.9375rem;color:var(--text-secondary);white-space:pre-wrap;word-break:keep-all;overflow-wrap:break-word}.letter-empty{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--text-dim);gap:var(--spacing-md);padding:var(--spacing-xl)}.letter-empty .material-symbols-outlined{font-size:4rem;opacity:.3}.letter-empty p{font-size:1.125rem;margin:0}@media (max-width: 1024px){.valentine-container{grid-template-columns:280px 1fr}}@media (max-width: 768px){.valentine-container{grid-template-columns:1fr;gap:var(--spacing-md);padding:var(--spacing-sm);min-height:auto}.shipgirl-panel{max-height:300px}.letter-panel{min-height:500px}.letter-header{padding:var(--spacing-sm) var(--spacing-md)}.letter-header-icon,.letter-header-placeholder{width:40px;height:40px}.letter-header-name{font-size:1.0625rem}.year-tabs{padding:var(--spacing-xs) var(--spacing-md)}.letter-content-wrapper{padding:var(--spacing-md)}.letter-card{padding:var(--spacing-lg) var(--spacing-md) var(--spacing-md)}.letter-text{font-size:.875rem}}@media (max-width: 480px){.shipgirl-item-icon,.shipgirl-item-placeholder{width:32px;height:32px}.letter-header-icon,.letter-header-placeholder{width:36px;height:36px}}