/* ═══════════════════════════════════════════════
   🎁 REFERRAL & REWARDS — Feature 15.3
   Theme: Amber/Gold (#f59e0b, #fbbf24)
   ═══════════════════════════════════════════════ */

/* Page Header */
.ref-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 0 16px;
    flex-wrap: wrap;
    gap: 12px;
}
.ref-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary, #f1f5f9);
    display: flex;
    align-items: center;
    gap: 10px;
}
.ref-title svg { width: 28px; height: 28px; stroke: #f59e0b; }

/* ═══════ TABS ═══════ */
.ref-tabs {
    display: flex;
    gap: 4px;
    background: var(--bg-elevated, #1e293b);
    border-radius: 12px;
    padding: 4px;
    margin-bottom: 20px;
    overflow-x: auto;
}
.ref-tab {
    flex: 1;
    min-width: 0;
    padding: 10px 12px;
    border: none;
    background: transparent;
    color: var(--text-secondary, #94a3b8);
    font-size: 13px;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    white-space: nowrap;
    transition: all .2s;
}
.ref-tab.active {
    background: linear-gradient(135deg, #f59e0b, #fbbf24);
    color: #000;
    box-shadow: 0 2px 8px rgba(245,158,11,.3);
}
.ref-tab:not(.active):hover { color: #f59e0b; }

/* ═══════ PANELS ═══════ */
.ref-panel { display: none; }
.ref-panel.active { display: block; }

/* ═══════ REFERRAL INVITE CARD ═══════ */
.ref-invite-card {
    background: linear-gradient(135deg, rgba(245,158,11,.12), rgba(251,191,36,.06));
    border: 1px solid rgba(245,158,11,.25);
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 20px;
    text-align: center;
}
.ref-invite-icon { font-size: 48px; margin-bottom: 12px; }
.ref-invite-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary, #f1f5f9);
    margin-bottom: 8px;
}
.ref-invite-desc {
    font-size: 13px;
    color: var(--text-secondary, #94a3b8);
    margin-bottom: 20px;
    line-height: 1.5;
}

/* Referral code box */
.ref-code-box {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-base, #0f172a);
    border: 1px solid rgba(245,158,11,.3);
    border-radius: 10px;
    padding: 12px 16px;
    margin: 0 auto 16px;
    max-width: 380px;
}
.ref-code-label {
    font-size: 11px;
    color: var(--text-secondary, #94a3b8);
    text-transform: uppercase;
    letter-spacing: .5px;
}
.ref-code-value {
    font-size: 20px;
    font-weight: 800;
    color: #f59e0b;
    letter-spacing: 2px;
    flex: 1;
    font-family: 'Courier New', monospace;
}
.ref-copy-btn {
    padding: 8px 16px;
    background: linear-gradient(135deg, #f59e0b, #fbbf24);
    color: #000;
    border: none;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    transition: all .2s;
}
.ref-copy-btn:hover { transform: scale(1.05); }
.ref-copy-btn.copied { background: #22c55e; color: #fff; }

/* Share buttons */
.ref-share-row {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 16px;
}
.ref-share-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    border-radius: 10px;
    border: none;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all .2s;
}
.ref-share-btn:hover { transform: translateY(-1px); }
.ref-share-btn.wa { background: #25d366; color: #fff; }
.ref-share-btn.tg { background: #0088cc; color: #fff; }
.ref-share-btn.link { background: var(--bg-elevated, #1e293b); color: var(--text-primary, #f1f5f9); border: 1px solid rgba(255,255,255,.1); }
.ref-share-btn svg { width: 16px; height: 16px; }

/* ═══════ REFERRAL STATS ═══════ */
.ref-stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}
.ref-stat-card {
    background: var(--bg-elevated, #1e293b);
    border: 1px solid rgba(255,255,255,.06);
    border-radius: 12px;
    padding: 16px;
    text-align: center;
}
.ref-stat-value {
    font-size: 24px;
    font-weight: 800;
    color: #f59e0b;
}
.ref-stat-label {
    font-size: 11px;
    color: var(--text-secondary, #94a3b8);
    margin-top: 4px;
}

/* ═══════ REFERRAL LIST ═══════ */
.ref-list-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary, #f1f5f9);
    margin-bottom: 12px;
}
.ref-list-card {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-elevated, #1e293b);
    border: 1px solid rgba(255,255,255,.06);
    border-radius: 12px;
    padding: 14px 16px;
    margin-bottom: 8px;
    transition: border-color .2s;
}
.ref-list-card:hover { border-color: rgba(245,158,11,.3); }
.ref-list-avatar {
    width: 40px; height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 16px;
    color: #fff;
    flex-shrink: 0;
}
.ref-list-info { flex: 1; min-width: 0; }
.ref-list-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary, #f1f5f9);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.ref-list-date {
    font-size: 11px;
    color: var(--text-secondary, #94a3b8);
}
.ref-list-bonus {
    font-size: 13px;
    font-weight: 700;
    color: #22c55e;
    white-space: nowrap;
}

/* ═══════ LOYALTY TIERS ═══════ */
.ref-tiers-container { margin-bottom: 20px; }

.ref-current-tier {
    background: var(--bg-elevated, #1e293b);
    border: 1px solid rgba(245,158,11,.25);
    border-radius: 16px;
    padding: 24px;
    text-align: center;
    margin-bottom: 20px;
    position: relative;
    overflow: hidden;
}
.ref-current-tier::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, #f59e0b, #fbbf24);
}
.ref-tier-icon { font-size: 56px; margin-bottom: 8px; }
.ref-tier-name {
    font-size: 22px;
    font-weight: 800;
    margin-bottom: 4px;
}
.ref-tier-name.bronze { color: #cd7f32; }
.ref-tier-name.silver { color: #c0c0c0; }
.ref-tier-name.gold { color: #ffd700; }
.ref-tier-name.platinum { color: #e5e4e2; }
.ref-tier-desc {
    font-size: 13px;
    color: var(--text-secondary, #94a3b8);
    margin-bottom: 16px;
}
/* Progress bar to next tier */
.ref-tier-progress {
    background: rgba(255,255,255,.06);
    border-radius: 8px;
    height: 10px;
    width: 100%;
    max-width: 320px;
    margin: 0 auto 8px;
    overflow: hidden;
}
.ref-tier-progress-bar {
    height: 100%;
    border-radius: 8px;
    transition: width .5s ease;
}
.ref-tier-progress-bar.bronze { background: linear-gradient(90deg, #cd7f32, #e8a961); }
.ref-tier-progress-bar.silver { background: linear-gradient(90deg, #a0a0a0, #c0c0c0); }
.ref-tier-progress-bar.gold { background: linear-gradient(90deg, #f59e0b, #ffd700); }
.ref-tier-progress-bar.platinum { background: linear-gradient(90deg, #a78bfa, #e5e4e2); }
.ref-tier-progress-text {
    font-size: 11px;
    color: var(--text-secondary, #94a3b8);
}

/* Tier cards */
.ref-tier-all {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}
.ref-tier-card {
    background: var(--bg-elevated, #1e293b);
    border: 1px solid rgba(255,255,255,.06);
    border-radius: 14px;
    padding: 18px;
    text-align: center;
    position: relative;
    transition: border-color .2s, transform .2s;
}
.ref-tier-card:hover { transform: translateY(-2px); }
.ref-tier-card.current { border-color: #f59e0b; }
.ref-tier-card-icon { font-size: 32px; margin-bottom: 6px; }
.ref-tier-card-name { font-size: 14px; font-weight: 700; margin-bottom: 4px; }
.ref-tier-card-req {
    font-size: 11px;
    color: var(--text-secondary, #94a3b8);
    margin-bottom: 8px;
}
.ref-tier-card-benefits {
    text-align: left;
    font-size: 11px;
    color: var(--text-secondary, #94a3b8);
    line-height: 1.6;
}
.ref-tier-card-benefits li { list-style: none; }
.ref-tier-card-benefits li::before {
    content: '✓ ';
    color: #22c55e;
    font-weight: 700;
}

/* ═══════ ACHIEVEMENTS ═══════ */
.ref-achievements-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}
.ref-badge-card {
    background: var(--bg-elevated, #1e293b);
    border: 1px solid rgba(255,255,255,.06);
    border-radius: 14px;
    padding: 18px;
    text-align: center;
    transition: all .2s;
}
.ref-badge-card.unlocked {
    border-color: rgba(245,158,11,.3);
    background: linear-gradient(135deg, rgba(245,158,11,.08), rgba(251,191,36,.03));
}
.ref-badge-card.locked { opacity: .5; filter: grayscale(.6); }
.ref-badge-icon { font-size: 40px; margin-bottom: 8px; }
.ref-badge-name {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-primary, #f1f5f9);
    margin-bottom: 4px;
}
.ref-badge-desc {
    font-size: 11px;
    color: var(--text-secondary, #94a3b8);
    line-height: 1.4;
}
.ref-badge-progress {
    margin-top: 8px;
    background: rgba(255,255,255,.06);
    border-radius: 6px;
    height: 6px;
    overflow: hidden;
}
.ref-badge-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, #f59e0b, #fbbf24);
    border-radius: 6px;
    transition: width .5s;
}
.ref-badge-progress-text {
    font-size: 10px;
    color: var(--text-secondary, #94a3b8);
    margin-top: 4px;
}
.ref-badge-check {
    display: inline-block;
    margin-top: 6px;
    font-size: 11px;
    font-weight: 700;
    color: #22c55e;
}

/* ═══════ REWARDS / REDEMPTION ═══════ */
.ref-points-banner {
    background: linear-gradient(135deg, rgba(245,158,11,.15), rgba(251,191,36,.05));
    border: 1px solid rgba(245,158,11,.25);
    border-radius: 14px;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}
.ref-points-icon { font-size: 40px; }
.ref-points-info { flex: 1; }
.ref-points-label {
    font-size: 12px;
    color: var(--text-secondary, #94a3b8);
}
.ref-points-value {
    font-size: 28px;
    font-weight: 800;
    color: #f59e0b;
}
.ref-points-sub {
    font-size: 11px;
    color: var(--text-secondary, #94a3b8);
}

.ref-rewards-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}
.ref-reward-card {
    display: flex;
    align-items: center;
    gap: 14px;
    background: var(--bg-elevated, #1e293b);
    border: 1px solid rgba(255,255,255,.06);
    border-radius: 14px;
    padding: 16px;
    transition: border-color .2s;
}
.ref-reward-card:hover { border-color: rgba(245,158,11,.3); }
.ref-reward-icon { font-size: 32px; flex-shrink: 0; }
.ref-reward-info { flex: 1; min-width: 0; }
.ref-reward-name {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-primary, #f1f5f9);
    margin-bottom: 2px;
}
.ref-reward-desc {
    font-size: 12px;
    color: var(--text-secondary, #94a3b8);
    line-height: 1.4;
}
.ref-reward-cost {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    color: #f59e0b;
    font-weight: 700;
    margin-top: 4px;
}
.ref-redeem-btn {
    padding: 8px 18px;
    border: none;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    transition: all .2s;
    white-space: nowrap;
    flex-shrink: 0;
}
.ref-redeem-btn.available {
    background: linear-gradient(135deg, #f59e0b, #fbbf24);
    color: #000;
}
.ref-redeem-btn.available:hover { transform: scale(1.05); }
.ref-redeem-btn.locked {
    background: rgba(255,255,255,.06);
    color: var(--text-secondary, #94a3b8);
    cursor: not-allowed;
}

/* ═══════ LOADING & EMPTY ═══════ */
.ref-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 40px 20px;
    color: var(--text-secondary, #94a3b8);
    font-size: 13px;
}
.ref-spinner {
    width: 24px; height: 24px;
    border: 3px solid rgba(245,158,11,.15);
    border-top-color: #f59e0b;
    border-radius: 50%;
    animation: refSpin 1s linear infinite;
}
@keyframes refSpin { to { transform: rotate(360deg); } }

.ref-empty {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary, #94a3b8);
    font-size: 13px;
}
.ref-empty-icon { font-size: 40px; margin-bottom: 10px; }

/* ═══════ HISTORY ═══════ */
.ref-history-card {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-elevated, #1e293b);
    border: 1px solid rgba(255,255,255,.06);
    border-radius: 12px;
    padding: 14px 16px;
    margin-bottom: 8px;
}
.ref-history-icon {
    width: 36px; height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}
.ref-history-icon.earned { background: rgba(34,197,94,.12); }
.ref-history-icon.redeemed { background: rgba(245,158,11,.12); }
.ref-history-info { flex: 1; min-width: 0; }
.ref-history-desc {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary, #f1f5f9);
}
.ref-history-date {
    font-size: 11px;
    color: var(--text-secondary, #94a3b8);
}
.ref-history-pts {
    font-size: 14px;
    font-weight: 700;
    white-space: nowrap;
}
.ref-history-pts.positive { color: #22c55e; }
.ref-history-pts.negative { color: #ef4444; }

/* ═══════ RESPONSIVE ═══════ */
@media (max-width: 600px) {
    .ref-header { padding: 16px 0 12px; }
    .ref-title { font-size: 18px; }
    .ref-stats-grid { grid-template-columns: repeat(3, 1fr); gap: 8px; }
    .ref-stat-value { font-size: 18px; }
    .ref-tier-all { grid-template-columns: 1fr; }
    .ref-achievements-grid { grid-template-columns: 1fr; }
    .ref-invite-card { padding: 18px; }
    .ref-code-box { flex-direction: column; text-align: center; }
    .ref-share-row { flex-direction: column; }
    .ref-share-btn { justify-content: center; }
    .ref-points-banner { flex-direction: column; text-align: center; }
}