/* ============= CSS VARIABLES & THEME ============= */
:root {
    --primary: #2563eb;
    --primary-light: #dbeafe;
    --primary-dark: #1d4ed8;
    --bg: #eff6ff;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --shadow: 0 2px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
    --red: #ef4444;
    --red-light: #fef2f2;
    --green: #10b981;
    --green-light: #ecfdf5;
    --blue: #2563eb;
    --blue-light: #dbeafe;
    --purple: #8b5cf6;
    --purple-light: #f5f3ff;
    --orange: #f97316;
    --orange-light: #fff7ed;
    --radius: 16px;
    --radius-sm: 12px;
    --radius-xs: 8px;
    --nav-height: 70px;
}

.dark {
    --bg: #0f172a;
    --card-bg: #1e293b;
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border: #334155;
    --shadow: 0 2px 12px rgba(0,0,0,0.3);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.4);
    --red-light: #451a1a;
    --green-light: #052e16;
    --blue-light: #172554;
    --purple-light: #2e1065;
    --orange-light: #431407;
    --primary-light: #1e3a5f;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-tap-highlight-color: transparent;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

/* ============= LOADING OVERLAY ============= */
.loading-overlay {
    position: fixed; top: 0; left: 0; right: 0; bottom: 0;
    background: var(--bg); z-index: 2000;
    display: flex; justify-content: center; align-items: center;
    transition: opacity 0.3s ease;
}
.loading-overlay.hide { opacity: 0; pointer-events: none; }
.loading-spinner { text-align: center; }
.loading-spinner i { font-size: 48px; color: var(--primary); margin-bottom: 16px; }
.loading-spinner p { color: var(--text-secondary); font-size: 14px; }

/* ============= ANIMATIONS ============= */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes slideIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}
@keyframes typing {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
    30% { transform: translateY(-8px); opacity: 1; }
}

/* ============= TOAST ============= */
.toast {
    position: fixed;
    bottom: calc(var(--nav-height) + 80px);
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--text); color: var(--bg);
    padding: 12px 24px; border-radius: var(--radius-xs);
    font-size: 13px; font-weight: 500;
    opacity: 0; transition: all 0.3s;
    z-index: 500; pointer-events: none;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

::-webkit-scrollbar { width: 0; }

/* ============= PWA INSTALL BANNER ============= */
.pwa-banner {
    position: fixed;
    bottom: calc(var(--nav-height) + 12px);
    left: 12px; right: 12px;
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-lg);
    padding: 12px 14px;
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 450;
    border: 1px solid var(--border);
    animation: slideIn 0.3s ease;
}
@media (min-width: 600px) {
    .pwa-banner { max-width: 480px; left: 50%; transform: translateX(-50%); right: auto; }
}
@media (min-width: 900px) {
    .pwa-banner { left: calc(var(--sidebar-width, 220px) + 16px); right: 16px; transform: none; max-width: 480px; }
}
.pwa-banner-icon { flex-shrink: 0; }
.pwa-banner-text { flex: 1; min-width: 0; }
.pwa-banner-text strong { display: block; font-size: 13px; font-weight: 700; }
.pwa-banner-text span { font-size: 11px; color: var(--text-muted); }
.pwa-install-btn {
    padding: 7px 14px; background: var(--primary); color: white;
    border: none; border-radius: var(--radius-xs);
    font-size: 12px; font-weight: 700; cursor: pointer; flex-shrink: 0;
}
.pwa-dismiss-btn {
    background: none; border: none; color: var(--text-muted);
    cursor: pointer; padding: 4px; font-size: 14px; flex-shrink: 0;
}