:root{color-scheme:light dark;--bg-canvas: #F0F2F5;--bg-surface: #FFFFFF;--bg-subtle: #F7F8FA;--bg-hover: #F2F3F5;--bg-active: #E4E6EB;--bg-active-hover: #D8DADF;--text-primary: #050505;--text-secondary: #4B4F56;--text-muted: #65676B;--border-subtle: #E4E6EB;--border-strong: #CED0D4;--border-hover: #8A8D91;--brand-primary: #0866FF;--brand-primary-hover: #0054E0;--brand-primary-soft: #E7F3FF;--brand-primary-text: #0051D5;--brand-primary-soft-hover: #D6E9FF;--brand-border: #B2D4FF;--status-available-bg: #EBF7EE;--status-available-text: #1B6E2D;--status-available-border: #B7E1C1;--status-available-hover: #DDF2E2;--status-used-bg: #F0F2F5;--status-used-text: #4B4F56;--status-used-border: #CED0D4;--status-expired-bg: #FDECEE;--status-expired-text: #B41E30;--status-expired-border: #F5B7BF;--warning-bg: #FEF6E6;--warning-text: #8A5300;--warning-border: #F5D491;--danger-text: #C91B2E;--danger-bg: #FFF0F2;--toast-bg: #1C1E21;--toast-error-bg: #7F1D1D;--toast-success-text: #4ADE80;--toast-error-text: #FCA5A5;--skeleton-base: #E9EBEF;--skeleton-shine: #F4F5F7;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-pill: 9999px;--shadow-card: 0 1px 2px rgba(0, 0, 0, .08);--shadow-elevated: 0 8px 24px rgba(0, 0, 0, .12), 0 1px 3px rgba(0, 0, 0, .08);--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;--font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace}@media (prefers-color-scheme: dark){:root{color-scheme:dark;--bg-canvas: #0B0D10;--bg-surface: #151A21;--bg-subtle: #1B212A;--bg-hover: #222933;--bg-active: #2A323D;--bg-active-hover: #343D49;--text-primary: #E8EAED;--text-secondary: #B7BDC6;--text-muted: #8B93A0;--border-subtle: #2A313B;--border-strong: #3B4552;--border-hover: #586372;--brand-primary: #2F6FED;--brand-primary-hover: #4A82F5;--brand-primary-soft: #16263D;--brand-primary-text: #8AB6FF;--brand-primary-soft-hover: #1D3352;--brand-border: #2B5A96;--status-available-bg: #102319;--status-available-text: #6FE39A;--status-available-border: #245536;--status-available-hover: #163322;--status-used-bg: #1B212A;--status-used-text: #B7BDC6;--status-used-border: #3B4552;--status-expired-bg: #2A1216;--status-expired-text: #FF8B9A;--status-expired-border: #5A2430;--warning-bg: #2A2111;--warning-text: #F3C46A;--warning-border: #5A4720;--danger-text: #FF8B9A;--danger-bg: #2A1216;--toast-bg: #242C36;--toast-error-bg: #5A1F27;--toast-success-text: #6FE39A;--toast-error-text: #FFB3BD;--skeleton-base: #1B212A;--skeleton-shine: #242C36;--shadow-card: 0 1px 2px rgba(0, 0, 0, .45);--shadow-elevated: 0 10px 30px rgba(0, 0, 0, .6)}}*,*:before,*:after{box-sizing:border-box}[hidden]{display:none!important}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;background-color:var(--bg-canvas)}body{margin:0;background-color:var(--bg-canvas);color:var(--text-primary);font-family:var(--font-sans);font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased}:focus-visible{outline:2px solid var(--brand-primary);outline-offset:2px}.skip-link{position:absolute;top:-100px;left:16px;z-index:999;padding:8px 16px;background:var(--brand-primary);color:#fff;font-weight:600;border-radius:var(--radius-sm);text-decoration:none}.skip-link:focus{top:12px}.top-notice-bar{background-color:var(--bg-surface);border-bottom:1px solid var(--border-subtle);font-size:13px;color:var(--text-secondary)}.top-notice-inner{max-width:1140px;margin:0 auto;padding:8px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.site-header{position:sticky;top:0;z-index:40;background-color:var(--bg-surface);border-bottom:1px solid var(--border-subtle);box-shadow:0 1px 2px #0000000a}.header-inner{max-width:1140px;margin:0 auto;padding:10px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.brand-group{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text-primary)}.brand-mark{width:38px;height:38px;border-radius:10px;background-color:var(--brand-primary);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-weight:800;font-size:18px;flex-shrink:0}.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:20px;align-items:stretch}@media (max-width: 900px){.hero-grid{grid-template-columns:1fr}}.spotlight-pool-box{background-color:var(--bg-subtle);border:1.5px solid var(--brand-border);border-radius:var(--radius-md);padding:20px;display:flex;flex-direction:column;justify-content:space-between;gap:14px}.spotlight-code-display{font-family:var(--font-mono);font-size:24px;font-weight:800;letter-spacing:.05em;padding:14px 16px;border-radius:var(--radius-sm);background-color:var(--bg-surface);border:1.5px dashed var(--brand-primary);color:var(--text-primary);text-align:center;word-break:break-all}.code-pill{font-family:var(--font-mono);font-size:17px;font-weight:800;letter-spacing:.04em;padding:9px 12px;border-radius:var(--radius-sm);background-color:var(--bg-subtle);border:1px dashed var(--border-strong);color:var(--text-primary);display:flex;align-items:center;justify-content:space-between;gap:8px;word-break:break-all}.code-pill.is-unavailable{text-decoration:line-through;color:var(--text-muted);background-color:var(--bg-subtle)}.quota-bar-track{width:100%;height:7px;background-color:var(--bg-active);border-radius:var(--radius-pill);overflow:hidden}.quota-bar-fill{height:100%;border-radius:var(--radius-pill);transition:width .25s ease}.status-badge{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:var(--radius-pill);font-size:12.5px;font-weight:600;line-height:1.2;border:1px solid transparent;white-space:nowrap}.status-badge.status-available{background-color:var(--status-available-bg);color:var(--status-available-text);border-color:var(--status-available-border)}.status-badge.status-used{background-color:var(--status-used-bg);color:var(--status-used-text);border-color:var(--status-used-border)}.status-badge.status-expired{background-color:var(--status-expired-bg);color:var(--status-expired-text);border-color:var(--status-expired-border)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:8px 14px;border-radius:var(--radius-sm);font-size:14px;font-weight:600;line-height:1.3;cursor:pointer;border:1px solid transparent;transition:background-color .14s ease,border-color .14s ease,color .14s ease;text-decoration:none;white-space:nowrap}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-primary{background-color:var(--brand-primary);color:#fff}.btn-primary:hover:not(:disabled){background-color:var(--brand-primary-hover)}.btn-secondary{background-color:var(--bg-active);color:var(--text-primary)}.btn-secondary:hover:not(:disabled){background-color:var(--bg-active-hover)}.btn-soft{background-color:var(--brand-primary-soft);color:var(--brand-primary-text)}.btn-soft:hover:not(:disabled){background-color:var(--brand-primary-soft-hover)}.btn-success-soft{background-color:var(--status-available-bg);color:var(--status-available-text);border-color:var(--status-available-border)}.btn-success-soft:hover:not(:disabled){background-color:var(--status-available-hover)}.btn-outline{background-color:var(--bg-surface);border-color:var(--border-strong);color:var(--text-primary)}.btn-outline:hover:not(:disabled){background-color:var(--bg-hover)}.meta-card{background-color:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-md);box-shadow:var(--shadow-card)}.input-field{width:100%;padding:10px 12px;border-radius:var(--radius-sm);border:1px solid var(--border-strong);background-color:var(--bg-surface);color:var(--text-primary);font-size:14.5px;font-family:inherit;transition:border-color .15s ease,box-shadow .15s ease}.input-field:hover{border-color:var(--border-hover)}.input-field:focus{outline:none;border-color:var(--brand-primary);box-shadow:0 0 0 3px #0866ff29}.input-field.has-error{border-color:var(--danger-text);background-color:var(--danger-bg)}.modal-backdrop{position:fixed;inset:0;z-index:80;background-color:#05050585;display:flex;align-items:center;justify-content:center;padding:16px}.modal-panel{width:100%;max-width:560px;max-height:90vh;overflow-y:auto;background-color:var(--bg-surface);border-radius:var(--radius-lg);box-shadow:var(--shadow-elevated);border:1px solid var(--border-subtle)}.toast-container{position:fixed;bottom:20px;right:20px;z-index:95;display:flex;flex-direction:column;gap:8px;max-width:calc(100vw - 32px)}.toast-item{background-color:var(--toast-bg);color:#fff;padding:10px 16px;border-radius:var(--radius-sm);border:1px solid var(--border-subtle);box-shadow:var(--shadow-elevated);font-size:13.5px;font-weight:500;display:flex;align-items:center;gap:8px}.toast-item.is-error{background-color:var(--toast-error-bg)}.skeleton{border-radius:6px;background:linear-gradient(90deg,var(--skeleton-base) 25%,var(--skeleton-shine) 37%,var(--skeleton-base) 63%);background-size:400% 100%;animation:skeleton-shimmer 1.2s ease infinite}@keyframes skeleton-shimmer{0%{background-position:100% 50%}to{background-position:0 50%}}@media (prefers-reduced-motion: reduce){.skeleton{animation:none}}@media (max-width: 640px){.toast-container{left:16px;right:16px;bottom:16px}}