/**
 * GlobalTrade OS - Design System Tokens & Base Component Library
 * Standard: Modern CSS Custom Properties & Responsive Utilities
 */

:root {
    /* Brand Color Palette */
    --gt-color-primary-900: #0b132b;
    --gt-color-primary-800: #1c2541;
    --gt-color-primary-700: #24325a;
    --gt-color-primary: #1c2541;
    --gt-color-primary-light: #3a506b;

    /* Trade Accents */
    --gt-color-teal-600: #0d9488;
    --gt-color-teal-500: #14b8a6;
    --gt-color-teal-100: #ccfbf1;
    --gt-color-accent: #0d9488;
    --gt-color-accent-hover: #0f766e;

    /* Verification & Trust Tiers */
    --gt-color-gold-600: #b45309;
    --gt-color-gold-500: #d97706;
    --gt-color-gold-400: #f59e0b;
    --gt-color-gold-100: #fef3c7;

    --gt-color-success-600: #059669;
    --gt-color-success-500: #10b981;
    --gt-color-success-100: #d1fae5;

    --gt-color-warning-500: #f59e0b;
    --gt-color-warning-100: #fef3c7;

    --gt-color-danger-600: #dc2626;
    --gt-color-danger-500: #ef4444;
    --gt-color-danger-100: #fee2e2;

    /* Neutrals & Surfaces */
    --gt-color-white: #ffffff;
    --gt-color-gray-50: #f8fafc;
    --gt-color-gray-100: #f1f5f9;
    --gt-color-gray-200: #e2e8f0;
    --gt-color-gray-300: #cbd5e1;
    --gt-color-gray-400: #94a3b8;
    --gt-color-gray-500: #64748b;
    --gt-color-gray-600: #475569;
    --gt-color-gray-700: #334155;
    --gt-color-gray-800: #1e293b;
    --gt-color-gray-900: #0f172a;

    --gt-color-bg: var(--gt-color-gray-50);
    --gt-color-surface: #ffffff;
    --gt-color-text: var(--gt-color-gray-800);
    --gt-color-text-muted: var(--gt-color-gray-500);
    --gt-color-border: var(--gt-color-gray-200);

    /* Typography */
    --gt-font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --gt-font-mono: 'JetBrains Mono', SFMono-Regular, Menlo, Monaco, Consolas, monospace;

    --gt-text-xs: 0.75rem;    /* 12px */
    --gt-text-sm: 0.875rem;   /* 14px */
    --gt-text-base: 1rem;     /* 16px */
    --gt-text-lg: 1.125rem;   /* 18px */
    --gt-text-xl: 1.25rem;    /* 20px */
    --gt-text-2xl: 1.5rem;    /* 24px */
    --gt-text-3xl: 1.875rem;  /* 30px */
    --gt-text-4xl: 2.25rem;   /* 36px */
    --gt-text-5xl: 3rem;      /* 48px */

    /* Shadows & Elevations */
    --gt-shadow-xs: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
    --gt-shadow-sm: 0 1px 3px 0 rgba(15, 23, 42, 0.1), 0 1px 2px -1px rgba(15, 23, 42, 0.1);
    --gt-shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.1), 0 2px 4px -2px rgba(15, 23, 42, 0.1);
    --gt-shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.1), 0 4px 6px -4px rgba(15, 23, 42, 0.1);
    --gt-shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.12), 0 8px 10px -6px rgba(15, 23, 42, 0.1);

    /* Radii */
    --gt-radius-sm: 4px;
    --gt-radius-md: 8px;
    --gt-radius-lg: 12px;
    --gt-radius-xl: 16px;
    --gt-radius-full: 9999px;

    /* Layout */
    --gt-container-max: 1280px;
    --gt-container-wide: 1440px;
    --gt-header-height: 72px;
}

/* Base Layout Containers */
.gt-container {
    width: 100%;
    max-width: var(--gt-container-max);
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
}

.gt-container-wide {
    width: 100%;
    max-width: var(--gt-container-wide);
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
}

.gt-grid {
    display: grid;
    gap: 1.5rem;
}

.gt-grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.gt-grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.gt-grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (max-width: 1024px) {
    .gt-grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .gt-grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
    .gt-grid-4, .gt-grid-3, .gt-grid-2 { grid-template-columns: 1fr; }
}

/* Button System */
.gt-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: var(--gt-text-sm);
    line-height: 1.25;
    padding: 0.625rem 1.25rem;
    border-radius: var(--gt-radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    user-select: none;
    white-space: nowrap;
}

.gt-btn:focus-visible {
    outline: 2px solid var(--gt-color-accent);
    outline-offset: 2px;
}

.gt-btn:disabled, .gt-btn[aria-disabled="true"] {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

.gt-btn-primary {
    background-color: var(--gt-color-primary-800);
    color: var(--gt-color-white);
    border-color: var(--gt-color-primary-800);
}

.gt-btn-primary:hover {
    background-color: var(--gt-color-primary-900);
    border-color: var(--gt-color-primary-900);
    color: var(--gt-color-white);
    box-shadow: var(--gt-shadow-sm);
}

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

.gt-btn-accent:hover {
    background-color: var(--gt-color-accent-hover);
    border-color: var(--gt-color-accent-hover);
    color: var(--gt-color-white);
    box-shadow: 0 4px 12px rgba(13, 148, 136, 0.25);
}

.gt-btn-secondary {
    background-color: var(--gt-color-white);
    color: var(--gt-color-gray-700);
    border-color: var(--gt-color-gray-300);
}

.gt-btn-secondary:hover {
    background-color: var(--gt-color-gray-50);
    border-color: var(--gt-color-gray-400);
    color: var(--gt-color-gray-900);
}

.gt-btn-outline-white {
    background-color: transparent;
    color: var(--gt-color-white);
    border-color: rgba(255, 255, 255, 0.4);
}

.gt-btn-outline-white:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: var(--gt-color-white);
    color: var(--gt-color-white);
}

.gt-btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: var(--gt-text-xs);
}

.gt-btn-lg {
    padding: 0.875rem 1.75rem;
    font-size: var(--gt-text-base);
}

/* B2B Trust & Verification Badges */
.gt-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.25rem 0.625rem;
    font-size: var(--gt-text-xs);
    font-weight: 600;
    line-height: 1;
    border-radius: var(--gt-radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.gt-badge-verified {
    background-color: var(--gt-color-success-100);
    color: var(--gt-color-success-600);
    border: 1px solid rgba(5, 150, 105, 0.2);
}

.gt-badge-gold {
    background-color: var(--gt-color-gold-100);
    color: var(--gt-color-gold-600);
    border: 1px solid rgba(217, 119, 6, 0.25);
}

.gt-badge-pending {
    background-color: var(--gt-color-warning-100);
    color: var(--gt-color-warning-500);
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.gt-badge-incoterm {
    background-color: var(--gt-color-gray-100);
    color: var(--gt-color-gray-700);
    border: 1px solid var(--gt-color-gray-300);
    font-family: var(--gt-font-mono);
}

/* Card System */
.gt-card {
    background-color: var(--gt-color-surface);
    border: 1px solid var(--gt-color-border);
    border-radius: var(--gt-radius-lg);
    box-shadow: var(--gt-shadow-xs);
    padding: 1.5rem;
    transition: all 0.2s ease;
}

.gt-card-hover:hover {
    border-color: var(--gt-color-gray-300);
    box-shadow: var(--gt-shadow-md);
    transform: translateY(-2px);
}

/* Form Controls */
.gt-form-group {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
    margin-bottom: 1.25rem;
}

.gt-label {
    font-size: var(--gt-text-sm);
    font-weight: 600;
    color: var(--gt-color-gray-700);
}

.gt-label-required::after {
    content: " *";
    color: var(--gt-color-danger-500);
}

.gt-input, .gt-select, .gt-textarea {
    width: 100%;
    padding: 0.625rem 0.875rem;
    font-size: var(--gt-text-sm);
    color: var(--gt-color-gray-800);
    background-color: var(--gt-color-white);
    border: 1px solid var(--gt-color-border);
    border-radius: var(--gt-radius-md);
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.gt-input:focus, .gt-select:focus, .gt-textarea:focus {
    outline: none;
    border-color: var(--gt-color-accent);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
}

.gt-hint {
    font-size: var(--gt-text-xs);
    color: var(--gt-color-gray-500);
}

.gt-error-text {
    font-size: var(--gt-text-xs);
    color: var(--gt-color-danger-600);
    font-weight: 500;
}

/* B2B Table */
.gt-table-responsive {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.gt-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--gt-text-sm);
    text-align: left;
}

.gt-table th {
    background-color: var(--gt-color-gray-100);
    color: var(--gt-color-gray-700);
    font-weight: 600;
    padding: 0.75rem 1rem;
    border-bottom: 2px solid var(--gt-color-border);
    white-space: nowrap;
}

.gt-table td {
    padding: 0.875rem 1rem;
    border-bottom: 1px solid var(--gt-color-border);
    color: var(--gt-color-gray-800);
}

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

/* ==========================================================================
   Stitch UI Component Enhancements & Interactive Modals
   ========================================================================== */

/* Modern Elevation & Shadows */
:root {
    --gt-shadow-subtle: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
    --gt-shadow-card: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --gt-shadow-card-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
    --gt-shadow-modal: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.gt-card-hover {
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.25s ease;
}

.gt-card-hover:hover {
    transform: translateY(-4px);
    box-shadow: var(--gt-shadow-card-hover);
    border-color: var(--gt-color-teal-500);
}

/* Stitch Modal Dialog System */
.gtos-modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(11, 19, 43, 0.65);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    z-index: 100000;
    transition: opacity 0.25s ease;
}

.gtos-modal-window {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 92%;
    max-width: 580px;
    background: #ffffff;
    border-radius: var(--gt-radius-xl);
    box-shadow: var(--gt-shadow-modal);
    border: 1px solid var(--gt-color-border);
    z-index: 100001;
    overflow: hidden;
    animation: gtosModalFadeIn 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes gtosModalFadeIn {
    from {
        opacity: 0;
        transform: translate(-50%, -46%) scale(0.96);
    }
    to {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }
}

.gtos-modal-header {
    background: var(--gt-color-primary-900);
    color: #ffffff;
    padding: 1.25rem 1.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 3px solid var(--gt-color-teal-500);
}

.gtos-modal-title {
    font-size: 1.2rem;
    font-weight: 800;
    color: #ffffff;
    margin: 0;
    line-height: 1.2;
}

.gtos-modal-close {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: #ffffff;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.gtos-modal-close:hover {
    background: rgba(255, 255, 255, 0.25);
}

.gtos-modal-body {
    padding: 1.75rem;
    max-height: 80vh;
    overflow-y: auto;
}

/* Alert Styling */
.gtos-alert {
    padding: 0.875rem 1.25rem;
    border-radius: var(--gt-radius-md);
    font-size: var(--gt-text-sm);
    font-weight: 600;
    line-height: 1.5;
}

.gtos-alert-success {
    background: #ecfdf5;
    border: 1px solid #a7f3d0;
    color: #065f46;
}

.gtos-alert-error {
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #991b1b;
}

.gtos-alert-info {
    background: #f0fdfa;
    border: 1px solid #99f6e4;
    color: #0f766e;
}

/* Smooth anchor scrolling */
html {
    scroll-behavior: smooth;
}