:root{--paper: #FBFAF7;--paper-raised: #FEFDFC;--ink: #1A1A17;--ink-muted: #56554E;--hairline: #E2DFD6;--control-border: #8F897A;--accent: #3A5A78;--success: #5B7553;--error: #9B4A3A;--reward: #C18A2B;--wash-cool: #E1EBF6;--wash-warm: #FAECDA;--paper-mesh: radial-gradient(120% 80% at 12% 0%, var(--wash-cool) 0%, transparent 55%), radial-gradient(120% 80% at 100% 18%, var(--wash-warm) 0%, transparent 50%), radial-gradient(100% 70% at 88% 100%, var(--wash-cool) 0%, transparent 55%), radial-gradient(110% 80% at 0% 92%, var(--wash-warm) 0%, transparent 55%), var(--paper);--lesson-card-top: #212F54;--lesson-card-bottom: #0D1219;--lesson-card-gold: #E1AD4D;--accent-wash: rgba(58, 90, 120, .1);--accent-wash-soft: rgba(58, 90, 120, .08);--surface: var(--paper);--surface-raised: var(--paper-raised);--text-primary: var(--ink);--text-secondary: var(--ink-muted);--rule: var(--hairline);--border-control: var(--control-border);--link: var(--accent);--feedback-correct: 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