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.spinner{width:40px;height:40px;border:3px solid var(--color-paper-darker);border-top-color:var(--color-vermillion);border-radius:50%;animation:spin 1s linear infinite;margin:0 auto var(--space-md)}.empty-icon,.login-icon{width:80px;height:80px;background:linear-gradient(135deg,var(--color-vermillion) 0%,var(--color-vermillion-dark) 100%);color:#fff;font-family:var(--font-chinese);font-size:2.5rem;font-weight:700;border-radius:16px;display:flex;align-items:center;justify-content:center;margin:0 auto var(--space-md)}.empty-state h2,.login-prompt h2{font-family:var(--font-display);font-size:1.5rem;color:var(--color-ink);margin:0 0 var(--space-sm)}.empty-state p,.login-prompt p{color:var(--color-ink-lighter);font-size:1rem;line-height:1.6;max-width:400px;margin:0 auto}.empty-actions{display:flex;justify-content:center;gap:var(--space-md);margin-top:var(--space-lg)}.action-link{color:var(--color-vermillion);text-decoration:none;font-weight:500;padding:.5rem 1rem;border:1px solid var(--color-vermillion);border-radius:6px;transition:all .2s ease}.action-link:hover{background:var(--color-vermillion);color:#fff}.error-banner{display:flex;justify-content:space-between;align-items:center;padding:var(--space-sm) var(--space-md);background:#c8351e1a;border:1px solid var(--color-vermillion);border-radius:8px;margin-bottom:var(--space-md);color:var(--color-vermillion-dark)}.error-banner button{background:none;border:none;color:var(--color-vermillion);font-size:1.25rem;cursor:pointer;padding:0 .5rem}@media(max-width:600px){.vocabulary-header{flex-direction:column;align-items:flex-start}.header-left{width:100%;justify-content:space-between}.vocabulary-controls{flex-direction:column;align-items:flex-start}.words-grid{grid-template-columns:1fr}}:root{--color-ink: #1a1a1a;--color-ink-light: #2d2d2d;--color-ink-lighter: #4a4a4a;--color-paper: #faf8f5;--color-paper-dark: #f5f2ed;--color-paper-darker: #e8e3da;--color-vermillion: #c8351e;--color-vermillion-light: #d9564a;--color-vermillion-dark: #9e2b18;--color-gold: #b8860b;--color-jade: #00695c;--color-shadow: rgba(0, 0, 0, .08);--color-shadow-strong: rgba(0, 0, 0, .15);--font-display: "Crimson Pro", serif;--font-chinese: "Noto Serif SC", serif;--font-mono: "JetBrains Mono", monospace;--space-xs: .5rem;--space-sm: 1rem;--space-md: 1.5rem;--space-lg: 2rem;--space-xl: 3rem;--space-2xl: 4rem;--border-width: 2px;--transition-base: .3s cubic-bezier(.4, 0, .2, 1);--transition-bounce: .5s cubic-bezier(.68, -.55, .265, 1.55)}*{box-sizing:border-box;margin:0;padding:0}.simplifier-container{min-height:100vh;background:linear-gradient(135deg,var(--color-paper) 0%,var(--color-paper-dark) 100%);position:relative;overflow-x:hidden;font-family:var(--font-display)}.bg-decoration{position:fixed;top:-10%;right:-5%;width:60%;height:120%;background:radial-gradient(circle at 30% 50%,rgba(200,53,30,.03) 0%,transparent 50%),radial-gradient(circle at 70% 30%,rgba(184,134,11,.02) 0%,transparent 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