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

:root {
    --grad-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --grad-income: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    --grad-expense: linear-gradient(135deg, #eb3349 0%, #f45c43 100%);
    --grad-balance: linear-gradient(135deg, #2b5876 0%, #4e4376 100%);
    --grad-btn: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --grad-danger: linear-gradient(135deg, #eb3349 0%, #f45c43 100%);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
    --shadow-card: 0 4px 24px rgba(0,0,0,0.06);
    --radius: 12px;
    --radius-lg: 16px;
    --text-primary: #1a1a2e;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border: #e8ecf1;
    --bg-page: #f4f6fb;
    --bg-card: #ffffff;
}

body {
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg-page);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: #667eea;
    text-decoration: none;
    transition: color 0.2s;
}
a:hover {
    color: #764ba2;
}

/* ===== Navbar ===== */
.navbar {
    background: var(--grad-primary);
    padding: 0 2rem;
    height: 64px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.3);
    position: sticky;
    top: 0;
    z-index: 100;
}
.navbar .logo {
    display: flex;
    align-items: center;
    line-height: 0;
    flex-shrink: 0;
}
.navbar .logo-img {
    display: block;
    height: 36px;
    max-height: 36px;
    width: auto;
    max-width: 120px;
    object-fit: contain;
}
.navbar .logo:hover {
    text-decoration: none;
    opacity: 0.9;
}
.nav-links {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}
.nav-links a {
    color: rgba(255,255,255,0.8);
    font-size: 0.9rem;
    font-weight: 500;
    padding: 0.4rem 0.85rem;
    border-radius: 8px;
    transition: all 0.2s;
}
.nav-links a:hover {
    color: #fff;
    background: rgba(255,255,255,0.15);
    text-decoration: none;
}

/* ===== Container ===== */
.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1.25rem;
    flex: 1;
}

/* ===== Headings ===== */
h1 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}
h2 {
    margin: 2rem 0 1rem;
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.3px;
}

/* ===== Alerts ===== */
.alert {
    padding: 0.85rem 1.15rem;
    border-radius: var(--radius);
    margin-bottom: 1.25rem;
    font-size: 0.9rem;
    font-weight: 500;
    backdrop-filter: blur(4px);
}
.alert ul {
    margin-left: 1.2rem;
}
.alert-success {
    background: linear-gradient(135deg, rgba(17,153,142,0.1) 0%, rgba(56,239,125,0.1) 100%);
    color: #0d7d6c;
    border: 1px solid rgba(17,153,142,0.25);
}
.alert-error {
    background: linear-gradient(135deg, rgba(235,51,73,0.08) 0%, rgba(244,92,67,0.08) 100%);
    color: #c0283e;
    border: 1px solid rgba(235,51,73,0.2);
}

/* ===== Forms ===== */
.form {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    width: 600px;
    border: 1px solid var(--border);
}
.form label {
    display: block;
    margin-top: 1rem;
    margin-bottom: 0.35rem;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.4px;
}
.form input[type="text"],
.form input[type="email"],
.form input[type="password"],
.form input[type="number"],
.form input[type="date"],
.form input[type="month"],
.form select {
    width: 100%;
    padding: 0.7rem 0.9rem;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 0.95rem;
    font-family: inherit;
    background: #f8f9fc;
    color: var(--text-primary);
    transition: all 0.25s;
}
.form input:focus,
.form select:focus {
    outline: none;
    border-color: #667eea;
    background: #fff;
    box-shadow: 0 0 0 4px rgba(102,126,234,0.12);
}
.form button[type="submit"],
.form .btn {
    display: inline-block;
    margin-top: 1.5rem;
    padding: 0.75rem 1.75rem;
    background: var(--grad-btn);
    color: #fff;
    border: none;
    border-radius: 10px;
    font-size: 0.95rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.25s;
    box-shadow: 0 4px 15px rgba(102,126,234,0.3);
}
.form button[type="submit"]:hover,
.form .btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(102,126,234,0.4);
}
.form .btn-secondary {
    background: linear-gradient(135deg, #94a3b8 0%, #7c8da3 100%);
    margin-left: 0.5rem;
    text-decoration: none;
    box-shadow: 0 4px 15px rgba(148,163,184,0.3);
}
.form .btn-secondary:hover {
    text-decoration: none;
    color: #fff;
    box-shadow: 0 6px 20px rgba(148,163,184,0.4);
}

/* Inline form (categories) */
.form-inline {
    display: flex;
    align-items: flex-end;
    gap: 0.8rem;
    width: 100%;
    align-items: center;
    margin-bottom: 20px;
}
.form-inline label {
    margin: 0;
}
.form-inline input {
    flex: 1;
}
.form-inline button {
    margin-top: 0;
}

.form.form-inline button {
    margin-top: 0 !important;
}

/* ===== Month filter ===== */
.month-filter {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 1.75rem;
    background: var(--bg-card);
    padding: 0.85rem 1.15rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    max-width: 420px;
    border: 1px solid var(--border);
}
.month-filter label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.9rem;
}
.month-filter input {
    padding: 0.5rem 0.7rem;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 0.9rem;
    font-family: inherit;
    background: #f8f9fc;
    transition: all 0.2s;
}
.month-filter input:focus {
    outline: none;
    border-color: #667eea;
    background: #fff;
}
.month-filter button {
    padding: 0.5rem 1.15rem;
    background: var(--grad-btn);
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    font-family: inherit;
    transition: all 0.2s;
    box-shadow: 0 2px 10px rgba(102,126,234,0.25);
}
.month-filter button:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(102,126,234,0.35);
}

/* ===== Summary cards ===== */
.summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
    margin-bottom: 2rem;
}
.card {
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    text-align: center;
    color: #fff;
    position: relative;
    overflow: hidden;
    transition: transform 0.25s, box-shadow 0.25s;
}
.card:hover {
    transform: translateY(-3px);
}
.card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, transparent 70%);
    pointer-events: none;
}
.card h3 {
    font-size: 0.8rem;
    color: rgba(255,255,255,0.85);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}
.card p {
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}
.card-income {
    background: var(--grad-income);
    box-shadow: 0 6px 24px rgba(17,153,142,0.3);
}
.card-income:hover {
    box-shadow: 0 8px 32px rgba(17,153,142,0.4);
}
.card-income p { color: #fff; }

.card-expense {
    background: var(--grad-expense);
    box-shadow: 0 6px 24px rgba(235,51,73,0.25);
}
.card-expense:hover {
    box-shadow: 0 8px 32px rgba(235,51,73,0.35);
}
.card-expense p { color: #fff; }

.card-balance {
    background: var(--grad-balance);
    box-shadow: 0 6px 24px rgba(43,88,118,0.3);
}
.card-balance:hover {
    box-shadow: 0 8px 32px rgba(43,88,118,0.4);
}
.card-balance p { color: #fff; }

/* ===== Table ===== */
.data-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    margin-bottom: 1.75rem;
    border: 1px solid var(--border);
}
.data-table th,
.data-table td {
    padding: 0.85rem 1.1rem;
    text-align: left;
    font-size: 0.9rem;
}
.data-table th {
    background: linear-gradient(135deg, #f8f9fc 0%, #eef0f6 100%);
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.6px;
    border-bottom: 2px solid var(--border);
}
.data-table td {
    border-bottom: 1px solid #f1f3f8;
}
.data-table tbody tr {
    transition: background 0.15s;
}
.data-table tbody tr:hover {
    background: #f8f9fd;
}
.data-table tbody tr:last-child td {
    border-bottom: none;
}
.data-table .total-row {
    background: linear-gradient(135deg, #f1f3f9 0%, #edf0f7 100%);
    font-weight: 600;
}

/* ===== Colors ===== */
.positive { color: #0d9668; font-weight: 600; }
.negative { color: #dc2626; font-weight: 600; }
.planned-amount { color: var(--text-muted); font-style: italic; }

/* ===== Status badges ===== */
.badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 6px;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.3px;
    white-space: nowrap;
}
.badge-completed {
    background: rgba(17,153,142,0.12);
    color: #0d7d6c;
}
.badge-planned {
    background: rgba(234,179,8,0.12);
    color: #a16207;
}
.badge-income {
    background: rgba(17,153,142,0.12);
    color: #0d7d6c;
}
.badge-expense {
    background: rgba(235,51,73,0.10);
    color: #c0283e;
}

/* ===== CSV Import info ===== */
.csv-info {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    margin-bottom: 1.5rem;
}
.csv-info h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}
.csv-info h4 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-top: 1rem;
    margin-bottom: 0.4rem;
    color: var(--text-secondary);
}
.csv-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}
.csv-info code {
    background: #f1f3f9;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.85rem;
    color: #667eea;
}
.csv-info pre {
    background: #f1f3f9;
    padding: 0.85rem 1rem;
    border-radius: 8px;
    font-size: 0.82rem;
    overflow-x: auto;
    line-height: 1.5;
    color: var(--text-primary);
}
.csv-info ul {
    margin-left: 1.2rem;
    font-size: 0.88rem;
    color: var(--text-secondary);
}
.csv-info ul li {
    margin-bottom: 0.25rem;
}
.form input[type="file"] {
    width: 100%;
    padding: 0.7rem 0.9rem;
    border: 2px dashed var(--border);
    border-radius: 10px;
    font-size: 0.95rem;
    font-family: inherit;
    background: #f8f9fc;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.25s;
}
.form input[type="file"]:hover {
    border-color: #667eea;
    background: #fff;
}

/* ===== Action links in tables ===== */
.actions-cell {
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}
.data-table td a {
    font-weight: 600;
    font-size: 0.85rem;
    padding: 0.3rem 0.65rem;
    border-radius: 6px;
    transition: all 0.2s;
    margin-right: 0.3rem;
}
.data-table td a:first-child {
    color: #667eea;
    background: rgba(102,126,234,0.08);
}
.data-table td a:first-child:hover {
    background: rgba(102,126,234,0.15);
    text-decoration: none;
}
.data-table td a:last-child {
    color: #eb3349;
    background: rgba(235,51,73,0.08);
}
.data-table td a:last-child:hover {
    background: rgba(235,51,73,0.15);
    text-decoration: none;
}

/* ===== Buttons ===== */
.btn-danger {
    background: var(--grad-danger);
    color: #fff;
    border: none;
    padding: 0.4rem 0.9rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    font-family: inherit;
    transition: all 0.25s;
    box-shadow: 0 3px 12px rgba(235,51,73,0.25);
}
.btn-danger:hover {
    transform: translateY(-1px);
    box-shadow: 0 5px 16px rgba(235,51,73,0.35);
}

/* ===== Footer ===== */
footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: auto;
}

/* ===== Hamburger button ===== */
.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    flex-direction: column;
    gap: 5px;
    z-index: 110;
}
.hamburger span {
    display: block;
    width: 24px;
    height: 2.5px;
    background: #fff;
    border-radius: 2px;
    transition: all 0.3s;
    transform-origin: center;
}
.hamburger.active span:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
}
.hamburger.active span:nth-child(2) {
    opacity: 0;
}
.hamburger.active span:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
}

/* ===== Responsive table wrapper ===== */
.table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin-bottom: 1.75rem;
}
.table-wrap .data-table {
    margin-bottom: 0;
}

/* ===== Responsive ===== */

/* Tablet */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
        margin: 1.5rem auto;
    }
    .summary-cards {
        grid-template-columns: 1fr 1fr;
    }
    .card p {
        font-size: 1.4rem;
    }
    .form {
        max-width: 100%;
    }
    .data-table th,
    .data-table td {
        padding: 0.65rem 0.75rem;
        font-size: 0.85rem;
    }
}

/* Mobile */
@media (max-width: 640px) {
    /* Hamburger visible */
    .hamburger {
        display: flex;
    }

    /* Navbar layout */
    .navbar {
        padding: 0 1rem;
        height: 56px;
        flex-wrap: nowrap;
    }
    .navbar .logo-img {
        height: 28px;
        max-height: 28px;
    }

    /* Slide-down nav */
    .nav-links {
        display: none;
        position: absolute;
        top: 56px;
        left: 0;
        right: 0;
        background: linear-gradient(135deg, #5a72d8 0%, #6d44a0 100%);
        flex-direction: column;
        padding: 0.5rem 0;
        box-shadow: 0 8px 24px rgba(0,0,0,0.15);
    }
    .nav-links.open {
        display: flex;
    }
    .nav-links a {
        padding: 0.75rem 1.5rem;
        font-size: 0.95rem;
        border-radius: 0;
        width: 100%;
    }
    .nav-links a:hover {
        background: rgba(255,255,255,0.1);
    }

    /* Container */
    .container {
        padding: 0;
        margin: 20px;
    }

    /* Typography */
    h1 {
        font-size: 1.35rem;
        margin-bottom: 1rem;
    }
    h2 {
        font-size: 1.1rem;
        margin: 1.25rem 0 0.75rem;
    }

    /* Cards — stack */
    .summary-cards {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }
    .card {
        padding: 1.15rem;
    }
    .card p {
        font-size: 1.5rem;
    }

    /* Forms */
    .form {
        width: 100%;
        max-width: 100%;
        padding: 1.25rem;
        border-radius: var(--radius);
    }
    .form button[type="submit"],
    .form .btn {
        width: 100%;
        text-align: center;
        margin-left: 0;
    }
    .form .btn-secondary {
        margin-left: 0;
        margin-top: 0.5rem;
    }
    .form-inline {
        flex-direction: column;
        align-items: stretch;
    }
    .form-inline button {
        margin-top: 0.5rem;
    }

    /* Month filter */
    .month-filter {
        flex-wrap: wrap;
        max-width: 100%;
    }
    .month-filter input {
        flex: 1;
        min-width: 0;
    }
    .month-filter button {
        width: 100%;
    }

    /* Table — responsive */
    .data-table {
        font-size: 0.82rem;
    }
    .data-table th,
    .data-table td {
        padding: 0.55rem 0.6rem;
    }
    .data-table td a {
        padding: 0.25rem 0.5rem;
        font-size: 0.78rem;
    }

    /* Badges */
    .badge {
        font-size: 0.7rem;
        padding: 0.15rem 0.45rem;
    }

    /* CSV info */
    .csv-info {
        padding: 1rem;
    }
    .csv-info pre {
        font-size: 0.72rem;
    }

    /* Footer */
    footer {
        padding: 1.25rem;
    }
}

/* Card layout for tables on small screens */
@media (max-width: 480px) {
    .data-table,
    .data-table thead,
    .data-table tbody,
    .data-table th,
    .data-table td,
    .data-table tr {
        display: block;
    }
    .data-table {
        border: none;
        box-shadow: none;
        background: transparent;
    }
    .data-table thead {
        position: absolute;
        width: 1px;
        height: 1px;
        overflow: hidden;
        clip: rect(0, 0, 0, 0);
    }
    .data-table tbody tr {
        background: var(--bg-card);
        border-radius: var(--radius);
        box-shadow: var(--shadow-sm);
        border: 1px solid var(--border);
        margin-bottom: 0.75rem;
        padding: 0.5rem 0;
    }
    .data-table tbody tr:hover {
        background: var(--bg-card);
    }
    .data-table td {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 0.5rem 1rem;
        border-bottom: 1px solid #f1f3f8;
        text-align: right;
        font-size: 0.85rem;
    }
    .data-table td::before {
        content: attr(data-label);
        font-weight: 700;
        font-size: 0.75rem;
        color: var(--text-secondary);
        text-transform: uppercase;
        letter-spacing: 0.4px;
        text-align: left;
        margin-right: 1rem;
        flex-shrink: 0;
    }
    .data-table td:last-child {
        border-bottom: none;
    }
    .data-table .total-row {
        border-radius: var(--radius);
    }
    .actions-cell {
        justify-content: flex-end;
    }
    .table-wrap {
        overflow-x: visible;
    }
}

/* Small phones */
@media (max-width: 380px) {
    .navbar {
        padding: 0 0.75rem;
    }
    .container {
        padding: 0 0.5rem;
    }
    .card p {
        font-size: 1.3rem;
    }
    .form {
        padding: 1rem;
    }
}

/* Safe area (notch) support */
@supports (padding: env(safe-area-inset-top)) {
    .navbar {
        padding-top: env(safe-area-inset-top);
        padding-left: max(1rem, env(safe-area-inset-left));
        padding-right: max(1rem, env(safe-area-inset-right));
    }
    footer {
        padding-bottom: max(1.25rem, env(safe-area-inset-bottom));
    }
}