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dd{margin:0;font-size:.95rem;font-weight:600;color:var(--color-text-primary)}.course-progress-card__cta{margin-top:auto;width:100%;justify-content:center}.course-discover-card{display:flex;flex-direction:column;background:var(--color-bg-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:22px;text-decoration:none;box-shadow:var(--shadow-xs);transition:box-shadow .18s ease,transform .18s ease,border-color .18s ease}.course-discover-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px);border-color:var(--color-border-strong)}.course-discover-card__title{font-size:1.05rem;font-weight:700;color:var(--color-text-primary);margin:0 0 8px}.course-discover-card__desc{font-size:.88rem;color:var(--color-text-secondary);line-height:1.5;margin:0 0 16px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.course-discover-card__foot{display:flex;justify-content:space-between;align-items:center;margin-top:auto;font-size:.82rem;color:var(--color-text-muted)}.course-discover-card__diff{font-weight:600;color:var(--color-accent-dark)}@media(max-width:640px){.mylearning{padding:32px 16px 72px}.mylearning__grid{grid-template-columns:1fr}}:root{--color-primary: #EA580C;--color-primary-dark: #C2410C;--color-primary-light: #FFEDD5;--color-primary-soft: #FFF7ED;--color-accent: #F59E0B;--color-accent-dark: #D97706;--color-accent-light: #FEF3C7;--color-accent-soft: #FFFBEB;--color-bg-main: #FBF9F4;--color-bg-secondary: #F4F1EA;--color-bg-sidebar: #F4F1EA;--color-bg-surface: #FFFFFF;--color-bg-elevated: #FFFFFF;--color-text-primary: #1B1A17;--color-text-secondary: #4B4540;--color-text-muted: #8B847A;--color-text-on-dark: #FFFFFF;--color-border: #E8E2D6;--color-border-light: #F1ECE0;--color-border-strong: #C9C2B3;--color-success: #16A34A;--color-success-light: #DCFCE7;--color-error: #DC2626;--color-error-light: #FEE2E2;--color-warning: #F59E0B;--color-warning-light: #FEF3C7;--color-info: #0EA5E9;--color-info-light: #E0F2FE;--color-mode-a: #DC2626;--color-mode-b: #EA580C;--color-mode-c: #16A34A;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--spacing-3xl: 5rem;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-xl: 24px;--radius-full: 9999px;--shadow-xs: 0 1px 2px rgba(27, 26, 23, .04);--shadow-sm: 0 2px 6px rgba(27, 26, 23, .05);--shadow-md: 0 6px 16px rgba(27, 26, 23, .07);--shadow-lg: 0 14px 32px rgba(27, 26, 23, .09);--shadow-glow-orange: 0 8px 24px rgba(234, 88, 12, .18);--shadow-glow-yellow: 0 8px 24px rgba(245, 158, 11, .2);--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Roboto, "Helvetica Neue", Arial, sans-serif;--font-display: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", sans-serif;--font-mono: "JetBrains Mono", "SF Mono", "Menlo", "Monaco", "Courier New", monospace;--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-normal: .25s cubic-bezier(.4, 0, .2, 1);--transition-slow: .4s cubic-bezier(.4, 0, .2, 1);--ease-out-expo: cubic-bezier(.16, 1, .3, 1);--header-height: 72px;--sidebar-width: 288px;--content-max-width: 1200px;--reader-max-width: 900px}*{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth}body{font-family:var(--font-sans);background-color:var(--color-bg-main);color:var(--color-text-primary);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}::-webkit-scrollbar{width:10px;height:10px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:var(--radius-full);border:2px solid var(--color-bg-main)}::-webkit-scrollbar-thumb:hover{background:var(--color-border-strong)}::selection{background-color:var(--color-primary-light);color:var(--color-primary-dark)}:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px;border-radius:var(--radius-sm)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.625rem 1.25rem;font-family:inherit;font-size:.9375rem;font-weight:600;line-height:1.2;border-radius:var(--radius-full);border:1px solid transparent;cursor:pointer;transition:transform var(--transition-fast),box-shadow var(--transition-fast),background-color var(--transition-fast),color var(--transition-fast),border-color var(--transition-fast);white-space:nowrap;-webkit-user-select:none;user-select:none}.btn:active{transform:translateY(1px)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background-color:var(--color-primary);color:var(--color-text-on-dark);box-shadow:var(--shadow-sm)}.btn-primary:hover:not(:disabled){background-color:var(--color-primary-dark);box-shadow:var(--shadow-glow-orange);transform:translateY(-1px)}.btn-secondary{background-color:var(--color-bg-surface);color:var(--color-text-primary);border-color:var(--color-border)}.btn-secondary:hover:not(:disabled){border-color:var(--color-text-primary);background-color:var(--color-bg-surface)}.btn-ghost{background:transparent;color:var(--color-text-primary)}.btn-ghost:hover:not(:disabled){background-color:var(--color-bg-secondary)}.btn-success{background-color:var(--color-success);color:#fff}.btn-error{background-color:var(--color-error);color:#fff}.btn-accent{background-color:var(--color-accent);color:var(--color-text-primary);box-shadow:var(--shadow-sm)}.btn-accent:hover:not(:disabled){background-color:var(--color-accent-dark);color:#fff;box-shadow:var(--shadow-glow-yellow);transform:translateY(-1px)}.btn-sm{padding:.4rem .85rem;font-size:.8125rem}.btn-lg{padding:.875rem 1.75rem;font-size:1rem}.card{background:var(--color-bg-surface);border:1px solid var(--color-border-light);border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-xs);transition:transform var(--transition-normal),box-shadow var(--transition-normal),border-color var(--transition-normal)}.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--color-border)}.badge{display:inline-flex;align-items:center;gap:.25rem;padding:.25rem .625rem;font-size:.75rem;font-weight:600;letter-spacing:.01em;border-radius:var(--radius-full)}.badge-primary{background:var(--color-primary-light);color:var(--color-primary-dark)}.badge-accent{background:var(--color-accent-light);color:var(--color-accent-dark)}.badge-success{background:var(--color-success-light);color:var(--color-success)}.badge-error{background:var(--color-error-light);color:var(--color-error)}.badge-warning{background:var(--color-warning-light);color:var(--color-accent-dark)}.spinner{width:24px;height:24px;border:2px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;animation:spin .8s linear infinite;display:inline-block}.spinner-sm{width:14px;height:14px;border-width:2px;margin-right:6px;vertical-align:middle}@keyframes spin{to{transform:rotate(360deg)}}.mode-a{--mode-color: var(--color-mode-a)}.mode-b{--mode-color: var(--color-mode-b)}.mode-c{--mode-color: var(--color-mode-c)}.mode-badge{background-color:var(--mode-color);color:#fff;padding:var(--spacing-xs) var(--spacing-md);border-radius:var(--radius-full);font-size:.8125rem;font-weight:600}@keyframes fadeInUp{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}@keyframes pulseGlow{0%,to{box-shadow:0 0 #f59e0b59}50%{box-shadow:0 0 0 12px #f59e0b00}}.fade-in-up{animation:fadeInUp var(--transition-slow) var(--ease-out-expo) both}.display-heading{font-family:var(--font-display);font-weight:800;letter-spacing:-.02em;line-height:1.08;color:var(--color-text-primary)}.display-heading .accent{color:var(--color-primary);position:relative}.display-heading .accent.underline:after{content:"";position:absolute;left:0;right:0;bottom:-.05em;height:.18em;background:var(--color-accent);border-radius:999px;z-index:-1;opacity:.55}.app{min-height:100vh;display:flex;flex-direction:column}.app-main{flex:1;display:flex;flex-direction:column}