/* ===== CSS Variables ===== */
:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --success: #10b981;
    --success-hover: #059669;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --secondary: #6366f1;
    --secondary-hover: #4f46e5;
}

/* Light Theme Variables */
.light-theme {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --border-hover: #cbd5e1;
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-lg: rgba(0, 0, 0, 0.15);
    --input-bg: #ffffff;
    --table-hover: #f8fafc;
}

/* Dark Theme Variables */
.dark-theme {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border: #334155;
    --border-hover: #475569;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-lg: rgba(0, 0, 0, 0.5);
    --input-bg: #1e293b;
    --table-hover: #1e293b;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ===== Container ===== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== Header ===== */
.header {
    background: var(--bg-primary);
    border-bottom: 2px solid var(--border);
    padding: 1.5rem 2rem;
    box-shadow: 0 2px 8px var(--shadow);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo {
    display: flex;
    align-items: center;
    animation: float 3s ease-in-out infinite;
}

.logo img {
    max-height: 50px;
    width: auto;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.theme-toggle {
    background: var(--bg-tertiary);
    border: 2px solid var(--border);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.5rem;
}

.theme-toggle:hover {
    background: var(--primary);
    border-color: var(--primary);
    transform: rotate(20deg) scale(1.1);
}

/* ===== Tabs Navigation ===== */
.tabs {
    display: flex;
    gap: 0.5rem;
    padding: 1rem 2rem 0;
    background: var(--bg-secondary);
}

.tab-btn {
    background: var(--bg-tertiary);
    border: 2px solid var(--border);
    border-bottom: none;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 12px 12px 0 0;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tab-btn:hover {
    background: var(--bg-primary);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.tab-btn.active {
    background: var(--bg-primary);
    color: var(--primary);
    border-color: var(--primary);
    font-weight: 600;
}

.tab-icon {
    font-size: 1.2rem;
}

/* ===== Main Content ===== */
.content {
    flex: 1;
    background: var(--bg-primary);
    padding: 2rem;
    border-left: 2px solid var(--border);
    border-right: 2px solid var(--border);
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.tab-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.tab-header h2 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* ===== Buttons ===== */
.action-buttons {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 2px 4px var(--shadow);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-lg);
}

.btn:active {
    transform: translateY(0);
}

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

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

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

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

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

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

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

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

.btn-warning {
    background: #f59e0b;
    color: white;
}

.btn-warning:hover {
    background: #d97706;
}

/* ===== Data Table ===== */
.table-container {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 4px 12px var(--shadow);
}

.table-wrapper {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-primary);
    border-radius: 8px;
    overflow: hidden;
}

.data-table th {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table td {
    padding: 0.5rem;
    border-bottom: 1px solid var(--border);
}

.data-table tbody tr {
    transition: background-color 0.2s ease;
}

.data-table tbody tr:hover {
    background: var(--table-hover);
}

.data-table input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border);
    border-radius: 6px;
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.data-table input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.data-table input::placeholder {
    color: var(--text-secondary);
}

/* ===== Results Section ===== */
.results-section {
    margin-top: 2rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: 12px;
    box-shadow: 0 4px 12px var(--shadow);
}

.results-section h3 {
    margin-bottom: 1rem;
    color: var(--primary);
    font-size: 1.5rem;
}

#resultsContent {
    margin-bottom: 1.5rem;
}

.result-item {
    padding: 1rem;
    background: var(--bg-primary);
    border-left: 4px solid var(--primary);
    border-radius: 6px;
    margin-bottom: 0.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.result-item:hover {
    background: var(--table-hover);
}

.result-label {
    font-weight: 600;
    color: var(--text-primary);
}

.result-value {
    font-size: 1.25rem;
    color: var(--primary);
    font-weight: 700;
}

/* ===== History ===== */
.history-list {
    display: grid;
    gap: 1rem;
}

.history-item {
    background: var(--bg-secondary);
    border: 2px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all 0.3s ease;
    cursor: pointer;
}

.history-item:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-lg);
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.history-date {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.history-data {
    display: grid;
    gap: 0.5rem;
}

.history-row {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.history-cell {
    padding: 0.5rem 1rem;
    background: var(--bg-primary);
    border-radius: 6px;
    font-size: 0.9rem;
}

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* ===== Help Content ===== */
.help-content {
    max-width: 800px;
    margin: 0 auto;
}

.help-content h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--primary);
    text-align: center;
}

.help-section {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 8px var(--shadow);
}

.help-section h3 {
    color: var(--primary);
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.help-section ul {
    list-style: none;
    padding-left: 0;
}

.help-section li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.help-section li::before {
    content: "▸";
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: bold;
}

kbd {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.2rem 0.5rem;
    font-family: monospace;
    font-size: 0.9em;
    box-shadow: 0 2px 0 var(--border);
}

.example-box {
    background: var(--bg-tertiary);
    border-left: 4px solid var(--success);
    padding: 1rem;
    border-radius: 6px;
    margin-top: 1rem;
}

.example-box p {
    margin: 0.5rem 0;
}

/* ===== Footer ===== */
.footer {
    background: var(--bg-primary);
    border-top: 2px solid var(--border);
    padding: 1.5rem 2rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .header {
        padding: 1rem;
    }

    h1 {
        font-size: 1.5rem;
    }

    .logo {
        font-size: 2rem;
    }

    .tabs {
        padding: 0.5rem 1rem 0;
        overflow-x: auto;
    }

    .tab-btn {
        padding: 0.75rem 1.25rem;
        font-size: 0.9rem;
    }

    .content {
        padding: 1rem;
    }

    .tab-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .action-buttons {
        width: 100%;
    }

    .btn {
        flex: 1;
        justify-content: center;
    }

    .table-container {
        padding: 1rem;
    }

    .data-table th,
    .data-table td {
        padding: 0.5rem;
        font-size: 0.9rem;
    }
}

/* ===== Animations ===== */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.loading {
    animation: pulse 1.5s ease-in-out infinite;
}