/**
 * Modern Light Theme
 * Clean, trustworthy, user-friendly design
 */

:root {
    /* Modern Light Blue Palette */
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #3b82f6;
    --color-primary-bg: #eff6ff;
    --color-primary-hover: #1e40af;

    --color-secondary: #6b7280;
    --color-secondary-dark: #4b5563;
    --color-secondary-light: #9ca3af;

    --color-accent: #0ea5e9;
    --color-accent-light: #38bdf8;

    /* Light Neutral Palette */
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;

    /* Bright Status Colors */
    --color-success: #10b981;
    --color-success-bg: #d1fae5;
    --color-warning: #f59e0b;
    --color-warning-bg: #fef3c7;
    --color-error: #ef4444;
    --color-error-bg: #fee2e2;
    --color-info: #3b82f6;
    --color-info-bg: #dbeafe;

    /* Typography - Premium Modern (Inter + Sarabun for Thai) */
    --font-family-base: 'Inter', 'Sarabun', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-family-heading: 'Inter', 'Sarabun', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-family-mono: 'JetBrains Mono', 'SF Mono', Monaco, 'Cascadia Code', 'Courier New', monospace;

    /* Modern Rounded Corners */
    --border-radius-sm: 6px;
    --border-radius-base: 8px;
    --border-radius-md: 10px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    --border-radius-full: 9999px;

    /* Spacing - Generous */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;

    /* Shadows - Soft and Modern */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-base: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
}

/* Global Styles */
body {
    background: #ffffff;
    color: var(--color-gray-800);
}

/* Modern Components */

/* Hero Section */
.hero-modern {
    background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%) !important;
    border-radius: 0 !important;
}

/* Modern Buttons */
.btn-modern,
.btn-modern-primary {
    background: var(--color-primary) !important;
    background-image: none !important;
    border-radius: var(--border-radius-lg) !important;
    box-shadow: var(--shadow-base) !important;
    transition: all 0.2s ease !important;
    font-weight: 500 !important;
}

.btn-modern:hover,
.btn-modern-primary:hover {
    background: var(--color-primary-hover) !important;
    transform: translateY(-1px) !important;
    box-shadow: var(--shadow-md) !important;
}

.btn-modern-secondary {
    background: white !important;
    background-image: none !important;
    border-radius: var(--border-radius-lg) !important;
    border: 1.5px solid var(--color-gray-300) !important;
    color: var(--color-gray-700) !important;
    box-shadow: var(--shadow-sm) !important;
    transition: all 0.2s ease !important;
}

.btn-modern-secondary:hover {
    background: var(--color-gray-50) !important;
    border-color: var(--color-gray-400) !important;
    transform: translateY(-1px) !important;
    box-shadow: var(--shadow-base) !important;
}

.btn-modern-white {
    background: white !important;
    color: var(--color-primary) !important;
    border: 2px solid white !important;
    border-radius: var(--border-radius-lg) !important;
    box-shadow: var(--shadow-md) !important;
    transition: all 0.2s ease !important;
    font-weight: 600 !important;
}

.btn-modern-white:hover {
    background: var(--color-gray-50) !important;
    transform: translateY(-1px) !important;
    box-shadow: var(--shadow-lg) !important;
}

.btn-modern-success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%) !important;
    color: white !important;
    border: 2px solid #10b981 !important;
    border-radius: var(--border-radius-lg) !important;
    box-shadow: 0 4px 14px 0 rgba(16, 185, 129, 0.4) !important;
    transition: all 0.3s ease !important;
    font-weight: 600 !important;
}

.btn-modern-success:hover {
    background: linear-gradient(135deg, #059669 0%, #047857 100%) !important;
    transform: translateY(-2px) !important;
    box-shadow: 0 8px 20px 0 rgba(16, 185, 129, 0.5) !important;
}

/* Feature Cards - Modern & Light */
.feature-card {
    background: white !important;
    border: 1px solid var(--color-gray-200) !important;
    border-radius: var(--border-radius-xl) !important;
    box-shadow: var(--shadow-sm) !important;
    transition: all 0.3s ease !important;
    padding: var(--space-6) !important;
}

.feature-card:hover {
    border-color: var(--color-primary-light) !important;
    transform: translateY(-4px) !important;
    box-shadow: var(--shadow-lg) !important;
}

.feature-icon {
    background: linear-gradient(135deg, var(--color-primary-bg) 0%, #dbeafe 100%) !important;
    background-image: linear-gradient(135deg, var(--color-primary-bg) 0%, #dbeafe 100%) !important;
    color: var(--color-primary) !important;
    border-radius: var(--border-radius-lg) !important;
    padding: var(--space-4) !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
}

/* Stats Cards - Clean & Modern */
.stat-card {
    background: white !important;
    background-image: none !important;
    border: 1px solid var(--color-gray-200) !important;
    border-radius: var(--border-radius-lg) !important;
    color: var(--color-gray-900) !important;
    box-shadow: var(--shadow-sm) !important;
    transition: all 0.2s ease !important;
}

.stat-card:hover {
    box-shadow: var(--shadow-md) !important;
    transform: translateY(-2px) !important;
}

.stat-value {
    color: var(--color-primary) !important;
    font-weight: 700 !important;
}

.stat-label {
    color: var(--color-gray-500) !important;
    text-transform: uppercase !important;
    font-size: 0.75rem !important;
    letter-spacing: 0.05em !important;
    font-weight: 500 !important;
}

/* Badges - Modern Light */
.quick-stat-badge,
.badge {
    background: var(--color-primary-bg) !important;
    color: var(--color-primary) !important;
    border: none !important;
    border-radius: var(--border-radius-full) !important;
    padding: 0.25rem 0.75rem !important;
    font-weight: 500 !important;
    font-size: 0.875rem !important;
}

.badge-secondary {
    background: var(--color-gray-100) !important;
    color: var(--color-gray-700) !important;
}

/* Tables - Modern Light */
.table {
    border: 1px solid var(--color-gray-200);
    border-collapse: collapse;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.table th {
    background: var(--color-gray-50);
    color: var(--color-gray-700);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--color-gray-200);
}

.table td {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--color-gray-100);
    background: white;
}

.table tbody tr:hover {
    background: var(--color-gray-50) !important;
}

.table tbody tr:hover td {
    background: var(--color-gray-50) !important;
}

/* Buttons - Modern & Friendly */
.btn {
    border-radius: var(--border-radius-lg);
    font-weight: 500;
    font-size: 0.9375rem;
    letter-spacing: 0;
    padding: 0.625rem 1.5rem;
    border: 1px solid transparent;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

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

.btn-outline {
    background: white;
    color: var(--color-primary);
    border-color: var(--color-gray-300);
}

.btn-outline:hover {
    background: var(--color-gray-50);
    border-color: var(--color-gray-400);
}

.btn-secondary {
    background: var(--color-gray-100);
    color: var(--color-gray-700);
    border-color: var(--color-gray-200);
}

.btn-secondary:hover {
    background: var(--color-gray-200);
    border-color: var(--color-gray-300);
}

.btn-lg {
    padding: 0.875rem 2rem;
    font-size: 1rem;
    border-radius: var(--border-radius-xl);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* Cards - Modern & Clean */
.card {
    border: 1px solid var(--color-gray-200);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-sm);
    background: white;
    overflow: hidden;
    transition: all 0.2s ease;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    background: var(--color-gray-50);
    border-bottom: 1px solid var(--color-gray-200);
    padding: 1.25rem 1.75rem;
}

.card-body {
    padding: 1.75rem;
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin: 0;
}

/* Alerts - Bright & Friendly */
.alert {
    border-radius: var(--border-radius-lg);
    border-left-width: 4px;
    border-left-style: solid;
    padding: 1rem 1.25rem;
    box-shadow: var(--shadow-sm);
}

.alert-info {
    background: #dbeafe;
    border-left-color: var(--color-info);
    color: #1e40af;
}

.alert-success {
    background: #d1fae5;
    border-left-color: var(--color-success);
    color: #065f46;
}

.alert-warning {
    background: #fef3c7;
    border-left-color: var(--color-warning);
    color: #92400e;
}

.alert-error {
    background: #fee2e2;
    border-left-color: var(--color-error);
    color: #991b1b;
}

/* Forms - Modern & Clean */
.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 0;
}

.form-row .form-group {
    margin-bottom: 1.5rem;
}

.form-input,
.form-select,
.form-textarea {
    border: 1.5px solid var(--color-gray-300);
    border-radius: var(--border-radius-lg);
    padding: 0.75rem 1rem;
    font-size: 0.9375rem;
    transition: all 0.2s ease;
    background: white;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    border-color: var(--color-primary);
    outline: none;
    box-shadow: 0 0 0 4px var(--color-primary-bg);
}

.form-input:hover,
.form-select:hover,
.form-textarea:hover {
    border-color: var(--color-gray-400);
}

.form-label {
    font-weight: 600;
    color: var(--color-gray-700);
    font-size: 0.875rem;
    text-transform: none;
    letter-spacing: 0;
    margin-bottom: 0.5rem;
    display: block;
}

.form-help {
    font-size: 0.8125rem;
    color: var(--color-gray-500);
    margin-top: 0.375rem;
    display: block;
}

/* Page Header - Modern */
.page-header {
    margin-bottom: var(--space-8);
}

.page-header h1 {
    color: var(--color-gray-900);
    font-weight: 700;
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.text-muted {
    color: var(--color-gray-500);
    font-size: 1rem;
}

/* Charts - Clean Design */
.histogram > div,
.difficulty-chart > div {
    background: var(--color-primary) !important;
    background-image: none !important;
    border-radius: 4px !important;
}

/* Site Header - Premium & Clean */
.site-header {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-gray-200);
    box-shadow: var(--shadow-sm);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.site-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
    letter-spacing: -0.025em;
}

.site-subtitle {
    font-size: 0.75rem;
    color: var(--color-gray-500);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.site-logo {
    text-decoration: none;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.125rem;
}

.site-logo:hover .site-title {
    color: var(--color-primary-light);
}

/* Language Switcher - Right Aligned */
.language-switcher {
    display: flex;
    gap: 0.5rem;
    margin-left: auto;
}

.lang-btn {
    min-width: 48px;
    font-weight: 600;
    border-radius: var(--border-radius-full) !important;
}

.lang-btn.active {
    background: var(--color-primary) !important;
    color: white !important;
    border-color: var(--color-primary) !important;
}

.lang-btn:not(.active):hover {
    background: var(--color-gray-100) !important;
}

/* Navigation - Modern */
.nav {
    background: var(--color-gray-50);
    border-bottom: 1px solid var(--color-gray-200);
}

.nav-link {
    color: var(--color-gray-600);
    font-weight: 500;
    padding: 0.75rem 1.25rem;
    border-radius: var(--border-radius-lg);
    transition: all 0.2s ease;
}

.nav-link:hover {
    background: white;
    color: var(--color-primary);
}

.nav-link.active {
    background: white;
    color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

/* Hide mobile navigation elements */
.mobile-nav-toggle {
    display: none !important;
}

/* Sections & Layout - Generous Spacing */
.section {
    margin-bottom: var(--space-12);
}

.container {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
}

.main-content,
.main {
    background: white;
    padding: var(--space-12) 0;
    min-height: calc(100vh - 200px);
}

/* Add breathing room for content */
main.container {
    padding-top: var(--space-10);
    padding-bottom: var(--space-12);
}

main.page-fade-in {
    padding-top: var(--space-10);
    padding-bottom: var(--space-12);
}

/* Footer - Clean */
.footer,
.site-footer {
    background: var(--color-gray-50);
    border-top: 1px solid var(--color-gray-200);
    padding: var(--space-8) 0;
    color: var(--color-gray-600);
    text-align: center;
}

/* Empty States - Friendly */
.empty-state {
    text-align: center;
    padding: var(--space-12) var(--space-6);
    background: var(--color-gray-50);
    border-radius: var(--border-radius-xl);
    border: 2px dashed var(--color-gray-300);
}

.empty-state-title {
    color: var(--color-gray-700);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-3);
}

.empty-state-description {
    color: var(--color-gray-500);
    font-size: 1rem;
    margin-bottom: var(--space-6);
}

/* Step Cards - Modern */
.step-card,
.steps-grid > div {
    background: white;
    border: 1px solid var(--color-gray-200);
    border-radius: var(--border-radius-xl);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.step-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary-light);
}

.step-number {
    background: var(--color-primary);
    color: white;
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius-full);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--space-4);
}

.step-title {
    color: var(--color-gray-900);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-3);
}

.step-description {
    color: var(--color-gray-600);
    font-size: 0.9375rem;
}

/* CTA Box - Clean & Professional */
.cta-box {
    background: white;
    color: var(--color-gray-900);
    padding: var(--space-12) var(--space-8);
    border-radius: var(--border-radius-xl);
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.cta-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--space-4);
    color: var(--color-gray-900);
}

.cta-description {
    font-size: 1.125rem;
    margin-bottom: var(--space-8);
    color: var(--color-gray-600);
}

/* Hero Stats - Clean */
.hero-stats {
    display: flex;
    gap: var(--space-6);
    margin-top: var(--space-8);
}

.hero-stat {
    text-align: center;
    padding: var(--space-4);
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--border-radius-lg);
    backdrop-filter: blur(10px);
}

.hero-stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: white;
    margin-bottom: var(--space-2);
}

.hero-stat-label {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
}

/* Ensure desktop layout */
@media (max-width: 768px) {
    body {
        min-width: 1024px;
    }
}