/* ===== CSS Variables ===== */
:root {
    --primary: #0f766e;
    --primary-dark: #0d5c56;
    --primary-light: #14b8a6;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    --bg: #f8fafc;
    --card: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08);
    --radius: 12px;
    --radius-sm: 8px;
    --nav-height: 64px;
    --topbar-height: 56px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Noto Sans Bengali', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    min-height: 100vh;
}

a {
    color: var(--primary);
    text-decoration: none;
}

/* ===== Layout ===== */
.container {
    width: 100%;
    max-width: 480px;
    margin: 0 auto;
    padding: 0 16px;
}

.main-content {
    padding-top: 16px;
    padding-bottom: 24px;
    min-height: 100vh;
}

.main-content.with-nav {
    padding-top: calc(var(--topbar-height) + 12px);
    padding-bottom: calc(var(--nav-height) + 20px);
}

/* ===== Top Bar ===== */
.top-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--topbar-height);
    background: var(--card);
    border-bottom: 1px solid var(--border);
    z-index: 100;
    display: flex;
    align-items: center;
}

.top-bar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.app-logo {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--primary);
}

.top-bar-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* ===== Badges ===== */
.badge {
    font-size: 0.7rem;
    font-weight: 600;
    padding: 3px 8px;
    border-radius: 20px;
}

.badge-premium {
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    color: #78350f;
}

.badge-free {
    background: #e2e8f0;
    color: #475569;
}

/* ===== User Menu ===== */
.user-menu {
    position: relative;
}

.user-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.95rem;
}

.user-dropdown {
    display: none;
    position: absolute;
    top: 44px;
    right: 0;
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    z-index: 200;
    overflow: hidden;
    border: 1px solid var(--border);
}

.user-dropdown.show {
    display: block;
}

.user-dropdown .user-info {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    background: var(--bg);
}

.user-dropdown .user-info strong {
    display: block;
    font-size: 0.95rem;
}

.user-dropdown .user-info small {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.user-dropdown a {
    display: block;
    padding: 11px 16px;
    color: var(--text);
    font-size: 0.9rem;
    transition: background 0.15s;
}

.user-dropdown a:hover {
    background: var(--bg);
}

.user-dropdown a.text-danger {
    color: var(--danger);
}

/* ===== Bottom Navigation ===== */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: var(--card);
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-around;
    align-items: center;
    z-index: 100;
    padding-bottom: env(safe-area-inset-bottom);
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    height: 100%;
    color: var(--text-muted);
    font-size: 0.7rem;
    transition: color 0.15s;
}

.nav-item.active {
    color: var(--primary);
}

.nav-icon {
    font-size: 1.35rem;
    margin-bottom: 2px;
}

.nav-add {
    position: relative;
}

.nav-add .nav-icon {
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: 0 4px 12px rgba(15, 118, 110, 0.35);
    margin-bottom: 0;
}

/* ===== Cards ===== */
.card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 16px;
    margin-bottom: 16px;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
}

/* ===== Stats Grid ===== */
.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 16px;
}

.stat-card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: var(--shadow);
}

.stat-card.income {
    border-left: 4px solid var(--success);
}

.stat-card.expense {
    border-left: 4px solid var(--danger);
}

.stat-card.balance {
    border-left: 4px solid var(--primary);
    grid-column: 1 / -1;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.stat-value {
    font-size: 1.35rem;
    font-weight: 700;
}

.stat-value.positive { color: var(--success); }
.stat-value.negative { color: var(--danger); }

/* ===== Forms ===== */
.form-group {
    margin-bottom: 16px;
}

.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text);
}

.form-control {
    width: 100%;
    padding: 12px 14px;
    font-size: 1rem;
    font-family: inherit;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--card);
    color: var(--text);
    transition: border-color 0.15s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.12);
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2364748b' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
}

textarea.form-control {
    resize: vertical;
    min-height: 80px;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 12px 20px;
    font-size: 0.95rem;
    font-weight: 600;
    font-family: inherit;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.15s;
    text-align: center;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-success {
    background: var(--success);
    color: white;
}

.btn-danger {
    background: var(--danger);
    color: white;
}

.btn-outline {
    background: transparent;
    border: 1.5px solid var(--border);
    color: var(--text);
}

.btn-outline:hover {
    background: var(--bg);
}

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: 7px 12px;
    font-size: 0.8rem;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* ===== Alerts ===== */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
    font-size: 0.9rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.alert-success {
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert-warning {
    background: #fef3c7;
    color: #92400e;
    border: 1px solid #fde68a;
}

.alert-info {
    background: #dbeafe;
    color: #1e40af;
    border: 1px solid #bfdbfe;
}

.alert-close {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: inherit;
    opacity: 0.7;
}

/* ===== Transaction List ===== */
.transaction-list {
    list-style: none;
}

.transaction-item {
    display: flex;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

.transaction-item:last-child {
    border-bottom: none;
}

.transaction-icon {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    margin-right: 12px;
    flex-shrink: 0;
}

.transaction-info {
    flex: 1;
    min-width: 0;
}

.transaction-title {
    font-weight: 500;
    font-size: 0.95rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.transaction-meta {
    font-size: 0.78rem;
    color: var(--text-muted);
}

.transaction-amount {
    font-weight: 600;
    font-size: 0.95rem;
    white-space: nowrap;
}

.transaction-amount.income { color: var(--success); }
.transaction-amount.expense { color: var(--danger); }

/* ===== Budget Progress ===== */
.budget-item {
    margin-bottom: 16px;
}

.budget-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 6px;
    font-size: 0.9rem;
}

.progress-bar {
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 0.3s;
}

.progress-fill.safe { background: var(--success); }
.progress-fill.warning { background: var(--warning); }
.progress-fill.danger { background: var(--danger); }

/* ===== Auth Pages ===== */
.auth-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 24px 0;
}

.auth-card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: 28px 24px;
}

.auth-logo {
    text-align: center;
    margin-bottom: 24px;
}

.auth-logo h1 {
    font-size: 1.6rem;
    color: var(--primary);
    margin-bottom: 4px;
}

.auth-logo p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.auth-footer {
    text-align: center;
    margin-top: 20px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* ===== Empty State ===== */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-muted);
}

.empty-state .icon {
    font-size: 3rem;
    margin-bottom: 12px;
}

/* ===== Premium Page ===== */
.premium-card {
    background: linear-gradient(135deg, #0f766e, #0d9488);
    color: white;
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
    margin-bottom: 20px;
}

.premium-card h2 {
    font-size: 1.4rem;
    margin-bottom: 8px;
}

.premium-features {
    list-style: none;
    margin: 20px 0;
}

.premium-features li {
    padding: 8px 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* ===== Utilities ===== */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 16px; }
.mb-2 { margin-bottom: 8px; }
.mb-3 { margin-bottom: 16px; }
.d-flex { display: flex; }
.gap-2 { gap: 8px; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }

/* ===== Type Toggle ===== */
.type-toggle {
    display: flex;
    background: var(--bg);
    border-radius: var(--radius-sm);
    padding: 4px;
    margin-bottom: 16px;
}

.type-toggle button {
    flex: 1;
    padding: 10px;
    border: none;
    background: transparent;
    border-radius: 6px;
    font-family: inherit;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: all 0.15s;
}

.type-toggle button.active.income {
    background: var(--success);
    color: white;
}

.type-toggle button.active.expense {
    background: var(--danger);
    color: white;
}

/* ===== Responsive ===== */
@media (min-width: 481px) {
    .container {
        max-width: 520px;
    }
}