:root {
  --bg: #0a0e17; --card: #111824; --border: #1e293b; --text: #e2e8f0; --muted: #64748b;
  --accent: #58a6ff; --accent-glow: rgba(88,166,255,0.12); --green: #3fb950; --red: #f85149;
  --orange: #d29922; --purple: #a371f7; --btn: #238636; --btn-hover: #2ea043; --input-bg: #0a0e17;
  --gold: #d29922; --gold-glow: rgba(210,153,34,0.12); --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--font); background: var(--bg); color: var(--text); line-height: 1.5; min-height: 100vh; }
a { color: var(--accent); text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

.layout { display: grid; grid-template-columns: 260px 1fr; min-height: 100vh; }

.sidebar { background: var(--card); border-right: 1px solid var(--border); padding: 24px 16px; display: flex; flex-direction: column; gap: 18px; }
.profile-header { text-align: center; padding-bottom: 16px; border-bottom: 1px solid var(--border); }
.avatar-wrap { width: 64px; height: 64px; border-radius: 50%; border: 2px solid var(--border); margin: 0 auto 10px; overflow: hidden; background: var(--bg); }
.avatar-wrap img { width: 100%; height: 100%; object-fit: cover; }
.profile-name { font-size: 1rem; font-weight: 700; }
.profile-email { font-size: 0.75rem; color: var(--muted); word-break: break-all; }
.profile-meta { display: flex; justify-content: center; gap: 6px; margin-top: 10px; flex-wrap: wrap; }

.meta-tag { font-size: 0.65rem; padding: 3px 10px; border-radius: 20px; border: 1px solid var(--border); color: var(--muted); font-weight: 600; }
.meta-tag.green { border-color: rgba(63,185,80,0.3); color: var(--green); background: rgba(63,185,80,0.06); }
.meta-tag.purple { border-color: rgba(163,113,247,0.3); color: var(--purple); background: rgba(163,113,247,0.06); }
.meta-tag.gold { border-color: rgba(210,153,34,0.3); color: var(--gold); background: rgba(210,153,34,0.06); }
.meta-tag.red { border-color: rgba(248,81,73,0.3); color: var(--red); background: rgba(248,81,73,0.06); }

.nav-list { display: flex; flex-direction: column; gap: 2px; }
.nav-item { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: 8px; font-size: 0.85rem; color: var(--muted); font-weight: 500; transition: all 0.15s; }
.nav-item:hover { background: rgba(88,166,255,0.04); color: var(--text); }
.nav-item.active { background: rgba(88,166,255,0.08); color: var(--accent); border: 1px solid rgba(88,166,255,0.15); }
.nav-item svg { width: 18px; height: 18px; opacity: 0.7; flex-shrink: 0; }
.nav-item.active svg { opacity: 1; }

.main-content { padding: 32px 28px; max-width: 1100px; }
.page-title { font-size: 1.6rem; font-weight: 700; margin-bottom: 24px; letter-spacing: -0.02em; }

.card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; overflow: hidden; box-shadow: 0 0 0 1px var(--border), 0 4px 20px rgba(0,0,0,0.4); margin-bottom: 20px; }
.card-header { padding: 16px 20px; border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; background: linear-gradient(90deg, rgba(88,166,255,0.03) 0%, transparent 100%); }
.card-header h2 { font-size: 0.92rem; font-weight: 600; display: flex; align-items: center; gap: 8px; }
.card-body { padding: 20px; }

.discount-balance-card { display: flex; align-items: center; justify-content: space-between; background: linear-gradient(135deg, rgba(210,153,34,0.08), rgba(163,113,247,0.04)); border: 1px solid rgba(210,153,34,0.2); border-radius: 12px; padding: 16px 20px; margin-bottom: 20px; }
.discount-balance-left { display: flex; align-items: center; gap: 12px; }
.discount-balance-icon { width: 40px; height: 40px; border-radius: 10px; display: flex; align-items: center; justify-content: center; background: rgba(210,153,34,0.1); border: 1px solid rgba(210,153,34,0.2); }
.discount-balance-icon svg { width: 20px; height: 20px; color: var(--gold); }
.discount-balance-title { font-size: 0.75rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; font-weight: 600; }
.discount-balance-value { font-size: 1.5rem; font-weight: 700; color: var(--gold); font-family: monospace; margin-top: 2px; }
.discount-balance-right { display: flex; flex-direction: column; align-items: flex-end; gap: 6px; }

.billing-toggle { display: flex; justify-content: center; gap: 0; margin-bottom: 24px; background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 4px; width: fit-content; margin-left: auto; margin-right: auto; }
.billing-toggle button { background: transparent; border: none; color: var(--muted); font-size: 0.78rem; font-weight: 600; padding: 7px 18px; border-radius: 8px; cursor: pointer; transition: all 0.15s; }
.billing-toggle button.active { background: var(--accent); color: white; }
.billing-toggle button:hover:not(.active) { color: var(--text); }
.billing-badge { font-size: 0.6rem; font-weight: 700; color: var(--green); margin-left: 4px; }

.tier-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.tier-card { background: var(--bg); border: 1px solid var(--border); border-radius: 12px; padding: 20px; text-align: center; transition: all 0.2s; position: relative; display: flex; flex-direction: column; }
.tier-card:hover { border-color: rgba(88,166,255,0.2); transform: translateY(-2px); }
.tier-card.popular { border-color: var(--purple); box-shadow: 0 0 0 1px var(--purple), 0 4px 20px rgba(163,113,247,0.08); }
.tier-card.current { border-color: var(--green); box-shadow: 0 0 0 1px var(--green), 0 4px 20px rgba(63,185,80,0.08); }
.tier-badge { position: absolute; top: -10px; left: 50%; transform: translateX(-50%); background: var(--purple); color: white; font-size: 0.6rem; font-weight: 700; padding: 3px 10px; border-radius: 20px; text-transform: uppercase; letter-spacing: 0.06em; }
.tier-badge.green { background: var(--green); }
.tier-badge.gold { background: var(--gold); color: #0a0e17; }
.tier-name { font-size: 1rem; font-weight: 700; margin-bottom: 4px; }
.tier-price { font-size: 1.8rem; font-weight: 700; margin-bottom: 2px; display: flex; align-items: baseline; justify-content: center; gap: 4px; }
.tier-price span { font-size: 0.72rem; color: var(--muted); font-weight: 500; }
.tier-price .strikethrough { font-size: 1.1rem; color: var(--red); text-decoration: line-through; opacity: 0.7; margin-right: 4px; }
.tier-period { font-size: 0.7rem; color: var(--muted); margin-bottom: 12px; }
.tier-desc { font-size: 0.72rem; color: var(--muted); margin-bottom: 16px; }
.tier-features { text-align: left; margin-bottom: 16px; flex: 1; }
.tier-features li { list-style: none; padding: 5px 0; font-size: 0.78rem; color: var(--text); display: flex; align-items: center; gap: 8px; border-bottom: 1px solid var(--border); }
.tier-features li:last-child { border-bottom: none; }
.tier-features li svg { width: 14px; height: 14px; color: var(--green); flex-shrink: 0; }
.tier-features li.muted { color: var(--muted); }
.tier-features li.muted svg { color: var(--muted); opacity: 0.5; }
.tier-limit { font-size: 0.65rem; color: var(--muted); margin-left: auto; font-family: monospace; }
.tier-limit.green { color: var(--green); }

.discount-slider-box { background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px; margin-bottom: 12px; text-align: left; }
.discount-slider-label { display: flex; justify-content: space-between; font-size: 0.72rem; color: var(--muted); margin-bottom: 6px; }
.discount-slider-label span { font-weight: 600; color: var(--text); }
.discount-slider-label .green { color: var(--green); }
.discount-slider { width: 100%; height: 4px; -webkit-appearance: none; background: var(--border); border-radius: 2px; outline: none; }
.discount-slider::-webkit-slider-thumb { -webkit-appearance: none; width: 14px; height: 14px; border-radius: 50%; background: var(--gold); cursor: pointer; box-shadow: 0 0 0 3px rgba(210,153,34,0.2); }
.discount-slider::-moz-range-thumb { width: 14px; height: 14px; border-radius: 50%; background: var(--gold); cursor: pointer; border: none; }
.tier-final { font-size: 0.75rem; color: var(--muted); margin-top: 4px; margin-bottom: 12px; }
.tier-final strong { color: var(--green); font-weight: 700; }
.btn { background: var(--btn); color: white; border: none; padding: 9px 18px; border-radius: 8px; cursor: pointer; font-size: 0.82rem; font-weight: 600; transition: all 0.2s; letter-spacing: 0.01em; width: 100%; }
.btn:hover { background: var(--btn-hover); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(35,134,54,0.25); }
.btn.outline { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn.outline:hover { border-color: var(--accent); color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }
.btn.purple { background: var(--purple); }
.btn.purple:hover { background: #b388f7; }
.btn.gold { background: linear-gradient(135deg, #d29922, #e3b341); color: #0a0e17; }
.btn.gold:hover { filter: brightness(1.1); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; box-shadow: none; }

.help-text { font-size: 0.72rem; color: var(--muted); margin-top: 4px; line-height: 1.4; }
.loading { display: inline-block; width: 14px; height: 14px; border: 2px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.6s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.import-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 14px; }
.import-stat { background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 12px; text-align: center; }
.import-stat-value { font-size: 1.2rem; font-weight: 700; color: var(--text); }
.import-stat-value.green { color: var(--green); }
.import-stat-value.red { color: var(--red); }
.import-stat-label { font-size: 0.6rem; color: var(--muted); margin-top: 2px; text-transform: uppercase; letter-spacing: 0.06em; }
.import-history { font-size: 0.78rem; }
.import-history-row { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid var(--border); }
.import-history-row:last-child { border-bottom: none; }
.import-history-date { font-family: monospace; color: var(--muted); }
.import-history-result { display: flex; gap: 12px; }
.import-history-result span { color: var(--muted); }
.import-history-result .green { color: var(--green); }
.import-history-result .red { color: var(--red); }

.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; font-size: 0.85rem; display: none; }
.alert.show { display: block; }
.alert.error { background: rgba(248,81,73,0.08); border: 1px solid rgba(248,81,73,0.2); color: var(--red); }
.alert.success { background: rgba(63,185,80,0.08); border: 1px solid rgba(63,185,80,0.2); color: var(--green); }
.alert.info { background: rgba(88,166,255,0.08); border: 1px solid rgba(88,166,255,0.2); color: var(--accent); }

.login-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; }
.login-card { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 40px; width: 100%; max-width: 400px; text-align: center; }
.login-title { font-size: 1.5rem; font-weight: 700; margin-bottom: 8px; }
.login-subtitle { font-size: 0.85rem; color: var(--muted); margin-bottom: 24px; }
.google-btn { background: white; color: #333; border: none; padding: 10px 20px; border-radius: 8px; font-weight: 600; cursor: pointer; display: inline-flex; align-items: center; gap: 8px; font-size: 0.9rem; }
.google-btn:hover { background: #f5f5f5; }

@media (max-width: 900px) { .layout { grid-template-columns: 1fr; } .sidebar { display: none; } .main-content { padding: 20px; } .tier-grid { grid-template-columns: 1fr; } .import-stats { grid-template-columns: repeat(2, 1fr); } }