/* =========================
   Design System Variables
   ========================= */
:root {
    --color-primary: #1f8ef1;
    --color-primary-strong: #3498db;
    --color-sidebar: #2c3e50;
    --color-bg: #f4f6f9;
    --color-surface: #ffffff;
    --color-muted: #7f8a9a;
    --color-text: #1f2d3d;
    --color-border: #e1e6ef;
    --color-success: #1abc9c;
    --color-danger: #e05858;
    --color-warning: #f2b233;

    --radius-xs: 6px;
    --radius-sm: 10px;
    --radius-md: 12px;
    --radius-lg: 16px;

    --shadow-sm: 0 6px 16px rgba(15, 23, 42, 0.08);
    --shadow-md: 0 16px 32px rgba(15, 23, 42, 0.12);
    --shadow-lg: 0 24px 48px rgba(15, 23, 42, 0.16);

    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-7: 32px;
    --space-8: 40px;

    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

/* =========================
   Base Reset & Global
   ========================= */
* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', 'Microsoft JhengHei', 'Helvetica Neue', sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    min-height: 100%;
}

body {
    overflow-y: auto;
}

img {
    max-width: 100%;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

/* =========================
   Dashboard Layout
   ========================= */
.dashboard-page {
    overflow: hidden;
    background: var(--color-bg);
}

.dashboard-container {
    display: grid;
    grid-template-columns: 260px 1fr;
    grid-template-rows: auto 1fr;
    grid-template-areas:
        "sidebar header"
        "sidebar main";
    height: 100vh;
}

.top-bar {
    grid-area: header;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: var(--space-5);
    align-items: center;
    padding: var(--space-4) var(--space-6);
    box-shadow: var(--shadow-sm);
    position: relative;
    z-index: 10;
}

.top-left {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    min-width: 0;
}

.hamburger-btn {
    display: none;
    width: 42px;
    height: 42px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-sidebar);
    font-size: 20px;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
}

.hamburger-btn:hover {
    background: #eef4ff;
    box-shadow: var(--shadow-md);
}

.info-group {
    display: grid;
    grid-template-columns: repeat(4, minmax(200px, 1fr));
    gap: var(--space-4);
    align-items: stretch;
    width: 100%;
}

.info-box {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-5);
    background: linear-gradient(145deg, #ffffff 0%, #f7f9fc 100%);
    border-radius: 12px;
    border: 1px solid #edf0f6;
    box-shadow: 0 12px 28px rgba(15, 23, 42, 0.12);
    min-width: 0;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.info-box:hover {
    transform: translateY(-4px);
    box-shadow: 0 18px 36px rgba(15, 23, 42, 0.16);
    border-color: #d6e3ff;
}

.info-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: rgba(31, 142, 241, 0.08);
    color: #3b82f6;
    flex-shrink: 0;
}

.info-icon svg {
    width: 22px;
    height: 22px;
}

.info-text {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
    width: 100%;
}

.info-box .label {
    font-size: 12px;
    color: #6c757d;
    letter-spacing: 0.4px;
}

.info-box .value {
    font-size: clamp(16px, 1.6vw, 26px);
    font-weight: 800;
    line-height: 1.2;
    font-family: 'Roboto Mono', 'Roboto', 'Segoe UI', 'Microsoft JhengHei', sans-serif;
    letter-spacing: 0.3px;
    white-space: nowrap;
}

.info-box.up {
    border-left: 4px solid #e74c3c;
}

.info-box.up .value,
.info-box.up .info-icon {
    color: #e74c3c;
}

.info-box.up .info-icon {
    background: rgba(231, 76, 60, 0.12);
}

.info-box.down {
    border-left: 4px solid #00a86b;
}

.info-box.down .value,
.info-box.down .info-icon {
    color: #00a86b;
}

.info-box.down .info-icon {
    background: rgba(0, 168, 107, 0.12);
}

.info-box.neutral {
    border-left: 4px solid #b7bec9;
}

.info-box.neutral .value,
.info-box.neutral .info-icon {
    color: #9aa4b2;
}

.info-box.neutral .info-icon {
    background: rgba(183, 190, 201, 0.16);
}

.top-actions {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.user-info {
    display: flex;
    flex-direction: column;
    color: var(--color-text);
    font-weight: 600;
}

.user-info small {
    color: var(--color-muted);
    font-weight: 500;
}

.action-buttons {
    display: flex;
    gap: var(--space-3);
    align-items: center;
}

.top-actions form {
    margin: 0;
}

/* =========================
   Sidebar
   ========================= */
.sidebar {
    grid-area: sidebar;
    background-color: var(--color-sidebar);
    color: #ecf0f1;
    padding: var(--space-6) var(--space-5);
    display: flex;
    flex-direction: column;
    box-shadow: 8px 0 24px rgba(15, 23, 42, 0.25);
    z-index: 30;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.sidebar h2 {
    margin: 0;
    font-size: 20px;
    font-weight: 700;
}

.close-sidebar-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.16);
    color: #ecf0f1;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-xs);
    font-size: 20px;
    cursor: pointer;
    display: none;
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.close-sidebar-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

.sidebar nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar nav li {
    margin-bottom: var(--space-5);
}

.chart-group h4 {
    margin: 0 0 var(--space-2);
    color: rgba(236, 240, 241, 0.7);
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.6px;
}

.add-chart-btn {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid transparent;
    color: #ecf0f1;
    cursor: pointer;
    border-radius: var(--radius-sm);
    font-size: 15px;
    text-align: left;
    background: rgba(255, 255, 255, 0.06);
    transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.add-chart-btn + .add-chart-btn {
    margin-top: var(--space-2);
}

.add-chart-btn:hover {
    background: rgba(255, 255, 255, 0.14);
    border-color: rgba(255, 255, 255, 0.18);
    transform: translateY(-1px);
}

.add-chart-btn.is-active {
    background: rgba(31, 142, 241, 0.22);
    border-color: rgba(31, 142, 241, 0.6);
    box-shadow: inset 0 0 0 1px rgba(31, 142, 241, 0.25);
}

#clear-all-btn {
    margin-top: auto;
    padding: 12px;
    background-color: #e74c3c;
    border: none;
    color: white;
    cursor: pointer;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    transition: background-color var(--transition-fast);
    text-align: center;
}

#clear-all-btn:hover {
    background-color: #d04435;
}

/* =========================
   Main Content & Charts
   ========================= */
.main-content {
    grid-area: main;
    padding: var(--space-6);
    overflow-y: auto;
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-5);
    align-content: start;
    background: var(--color-bg);
}

.placeholder {
    width: 100%;
    text-align: center;
    color: var(--color-muted);
    font-size: 1.1em;
    margin-top: var(--space-8);
}

.chart-card {
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--space-4);
    min-height: clamp(320px, 45vh, 420px);
    display: flex;
    flex-direction: column;
    width: 100%;
}

.chart-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #eef1f6;
    padding-bottom: var(--space-3);
    margin-bottom: var(--space-3);
}

.chart-card-header h3 {
    margin: 0;
    font-size: 16px;
}

.close-btn {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: #9aa3b2;
    transition: color var(--transition-fast);
}

.close-btn:hover {
    color: #42526b;
}

.chart-container {
    width: 100%;
    flex: 1;
}

/* =========================
   Buttons & Form Controls
   ========================= */
.primary-btn,
.secondary-btn,
.danger-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 11px 18px;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    font-size: 14px;
    text-decoration: none;
    transition: all var(--transition-fast);
    font-weight: 600;
    letter-spacing: 0.2px;
    white-space: nowrap;
}

.primary-btn {
    background: linear-gradient(135deg, var(--color-primary), #0061d5);
    color: #fff;
    box-shadow: 0 6px 14px rgba(0, 97, 213, 0.25);
}

.primary-btn:hover {
    background: linear-gradient(135deg, #3aa0f8, #0a74de);
    transform: translateY(-1px);
}

.secondary-btn {
    background: #ffffff;
    color: var(--color-sidebar);
    box-shadow: inset 0 0 0 1px #c2d6ff;
}

.secondary-btn:hover {
    background: #f1f6ff;
    box-shadow: inset 0 0 0 1px #9fbafc;
    transform: translateY(-1px);
}

.danger-btn {
    background: #f56c6c;
    color: #fff;
    box-shadow: 0 6px 14px rgba(245, 108, 108, 0.25);
}

.danger-btn:hover {
    background: #ff7b7b;
    transform: translateY(-1px);
}

.alert {
    background: #fff6d7;
    color: #8a6400;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid #ffe3a0;
    margin-bottom: var(--space-4);
}

input,
select,
textarea {
    padding: 12px 14px;
    border-radius: var(--radius-xs);
    border: 1px solid var(--color-border);
    font-size: 14px;
    background-color: #fff;
    transition: box-shadow var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(31, 142, 241, 0.2);
    background-color: #fff;
}

.form-grid {
    display: grid;
    gap: var(--space-3);
}

.form-grid label {
    display: flex;
    flex-direction: column;
    color: var(--color-text);
    font-size: 14px;
    font-weight: 600;
}

.form-grid input,
.form-grid select {
    margin-top: 6px;
}

.checkbox-inline {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--color-text);
    font-size: 13px;
}

/* =========================
   Landing / Login
   ========================= */
.landing-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: var(--space-8) var(--space-4);
    background: linear-gradient(180deg, #eef2f9 0%, #f7f9fc 100%);
}

.auth-wrapper {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    max-width: 1100px;
    width: 100%;
    background: rgba(255, 255, 255, 0.9);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    backdrop-filter: blur(6px);
}

.landing-intro {
    background: var(--color-sidebar);
    color: #ecf0f1;
    padding: var(--space-8) var(--space-7);
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: var(--space-4);
}

.landing-intro h1 {
    margin: 0;
    font-size: 30px;
    letter-spacing: 0.3px;
}

.landing-intro ul {
    color: #dfe6eb;
    margin: 0;
    padding-left: 20px;
    line-height: 1.6;
}

.login-card {
    background: rgba(255, 255, 255, 0.92);
    padding: var(--space-7);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    border-left: 1px solid rgba(226, 232, 240, 0.8);
    backdrop-filter: blur(6px);
}

.login-card h2 {
    margin: 0;
    color: var(--color-text);
}

/* =========================
   Admin Page
   ========================= */
.admin-page {
    background: var(--color-bg);
    min-height: 100vh;
}

.admin-wrapper {
    max-width: 1200px;
    margin: 30px auto;
    padding: var(--space-6);
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--color-surface);
    padding: var(--space-4) var(--space-5);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--space-5);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-4);
    margin-bottom: var(--space-5);
}

.card {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    padding: var(--space-5);
    box-shadow: var(--shadow-sm);
    border: none;
}

.card h2 {
    margin-top: 0;
    color: var(--color-text);
}

.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-surface);
    min-width: 520px;
}

.data-table thead {
    background: #e9eff8;
}

.data-table th {
    padding: 12px 10px;
    text-align: left;
    color: var(--color-text);
    font-weight: 700;
    font-size: 13px;
}

.data-table td {
    padding: 12px 10px;
    border-bottom: 1px solid #eef0f4;
    color: #3a4a5a;
    font-size: 14px;
}

.data-table tbody tr:nth-child(even) {
    background: #f7f9fc;
}

.data-table tbody tr:hover {
    background: #edf3ff;
}

/* =========================
   Overlay
   ========================= */
.content-overlay {
    display: none;
}

/* =========================
   Responsive
   ========================= */
@media (max-width: 1100px) {
    .top-bar {
        grid-template-columns: 1fr;
        align-items: stretch;
    }

    .top-actions {
        justify-content: space-between;
    }

    .info-group {
        width: 100%;
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: var(--space-3);
    }

    .info-box {
        min-width: 0;
    }
}

@media (max-width: 900px) {
    .auth-wrapper {
        grid-template-columns: 1fr;
    }

    .landing-intro {
        padding: var(--space-6) var(--space-5);
    }

    .login-card {
        padding: var(--space-6) var(--space-5);
        border-left: none;
    }
}

@media (max-width: 768px) {
    .dashboard-container {
        grid-template-columns: 1fr;
        grid-template-rows: auto 1fr;
        grid-template-areas:
            "header"
            "main";
        height: auto;
    }

    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        width: 260px;
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
        z-index: 1200;
    }

    body.sidebar-open .sidebar {
        transform: translateX(0);
    }

    .content-overlay {
        display: block;
        position: fixed;
        inset: 0;
        background: rgba(15, 23, 42, 0.55);
        opacity: 0;
        visibility: hidden;
        transition: opacity var(--transition-normal), visibility var(--transition-normal);
        z-index: 1100;
    }

    body.sidebar-open .content-overlay {
        opacity: 1;
        visibility: visible;
    }

    .hamburger-btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .close-sidebar-btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .top-bar {
        padding: var(--space-4);
        gap: var(--space-3);
    }

    .top-actions {
        flex-direction: column;
        align-items: flex-start;
        width: 100%;
    }

    .action-buttons {
        width: 100%;
        flex-wrap: wrap;
    }

    .main-content {
        padding: var(--space-4);
    }
}

@media (max-width: 640px) {
    .top-bar {
        grid-template-columns: 1fr;
    }

    .info-group {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .gauge-container {
        display: none;
    }
}

@media (max-width: 480px) {
    .info-group {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 768px) {
    .main-content {
        grid-template-columns: minmax(0, 1fr);
    }
}

@media (min-width: 1280px) {
    .main-content {
        grid-template-columns: minmax(0, 1fr);
    }
}