/* Vietnam eSIM - Custom Styles */
/* Color Scheme: Professional & Trustworthy */

:root {
    /* Primary Colors - Refined */
    --vn-red: #D92038;
    --vn-red-dark: #B81A2F;
    --vn-red-light: #E84357;
    --vn-yellow: #F5C518;
    --vn-yellow-dark: #D4A912;
    --vn-yellow-light: #FFD93D;

    /* Neutral Palette - Professional */
    --vn-dark: #1C1C28;
    --vn-gray-dark: #2E2E3A;
    --vn-gray: #5A5A6E;
    --vn-gray-light: #8E8E9A;
    --vn-light: #F7F8FA;
    --vn-white: #FFFFFF;
    --vn-accent: #0095D9;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.12);

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease;
}

/* Base Reset & Typography */
html {
    margin-left: 0 !important;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.65;
    color: var(--vn-dark);
    letter-spacing: -0.01em;
}

p {
    font-size: 1rem;
    line-height: 1.65;
    margin-bottom: 1rem;
    color: var(--vn-gray);
}

.text-muted {
    color: var(--vn-gray) !important;
}

/* Headings - Clear Hierarchy */
h1, h2, h3, h4, h5, h6 {
    color: var(--vn-dark);
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.3;
}

h1 { font-size: 2.25rem; margin-bottom: 1rem; }
h2 { font-size: 1.75rem; margin-bottom: 0.875rem; }
h3, .h5 { font-size: 1.25rem; }
h4, .h6 { font-size: 1.125rem; }

.small, small {
    font-size: 0.875rem !important;
    letter-spacing: 0;
}

/* Links */
a {
    color: var(--vn-red);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--vn-red-dark);
}

/* Hero Section */
.hero-section {
    background: linear-gradient(145deg, var(--vn-red) 0%, var(--vn-red-dark) 60%, var(--vn-dark) 100%);
    color: var(--vn-white);
    padding: 4rem 0;
    text-align: center;
    position: relative;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--vn-red), var(--vn-yellow), var(--vn-accent));
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--vn-white) !important;
    letter-spacing: -0.03em;
}

.hero-subtitle {
    font-size: 1.125rem;
    max-width: 580px;
    margin: 0 auto 2rem;
    color: rgba(255, 255, 255, 0.92);
    line-height: 1.6;
    font-weight: 400;
}

@media (max-width: 768px) {
    .hero-section { padding: 3rem 0; }
    .hero-title { font-size: 1.75rem; }
    .hero-subtitle { font-size: 1rem; }
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    h3, .h5 { font-size: 1.125rem; }
}

/* Buttons - Refined */
.btn {
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 500;
    padding: 0.625rem 1.25rem;
    border-radius: 8px !important;
    min-height: 44px;
    transition: all var(--transition-normal);
    letter-spacing: -0.01em;
}

.btn-lg {
    font-size: 1rem;
    padding: 0.875rem 1.75rem;
    min-height: 52px;
    border-radius: 10px !important;
}

.btn-sm {
    font-size: 0.875rem;
    padding: 0.5rem 1rem;
    min-height: 38px;
    border-radius: 6px !important;
}

.btn-esim {
    background: var(--vn-red);
    color: var(--vn-white);
    font-weight: 600;
    border: none;
    box-shadow: 0 2px 4px rgba(217, 32, 56, 0.2);
}

.btn-esim:hover {
    background: var(--vn-red-dark);
    color: var(--vn-white);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(217, 32, 56, 0.3);
}

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

.btn-dark {
    background: var(--vn-dark);
    color: var(--vn-white);
    border: none;
}

.btn-dark:hover {
    background: var(--vn-gray-dark);
    color: var(--vn-white);
}

.btn-outline-light {
    border: 1.5px solid rgba(255, 255, 255, 0.9);
    color: var(--vn-white);
    background: transparent;
}

.btn-outline-light:hover {
    background: var(--vn-white);
    color: var(--vn-dark);
    border-color: var(--vn-white);
}

.btn-outline-dark {
    border: 1.5px solid var(--vn-dark);
    color: var(--vn-dark);
    background: transparent;
}

.btn-outline-dark:hover {
    background: var(--vn-dark);
    color: var(--vn-white);
}

.btn-outline-secondary {
    border: 1.5px solid var(--vn-gray-light);
    color: var(--vn-gray);
    background: transparent;
}

.btn-outline-secondary:hover {
    background: var(--vn-gray);
    color: var(--vn-white);
    border-color: var(--vn-gray);
}

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

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

/* Cards - Clean & Professional */
.card {
    border-radius: 12px;
    border: 1px solid rgba(0, 0, 0, 0.06);
    box-shadow: var(--shadow-sm);
    background: var(--vn-white);
    transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

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

.card-header {
    background: var(--vn-dark) !important;
    color: var(--vn-white) !important;
    border-radius: 12px 12px 0 0 !important;
    padding: 1rem 1.25rem;
    border-bottom: none;
    font-weight: 500;
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
}

.card-body {
    padding: 1.25rem;
}

/* Feature Cards */
.feature-card {
    text-align: center;
    padding: 1.75rem 1.25rem;
    background: var(--vn-white);
    border-radius: 12px;
    border: 1px solid rgba(0, 0, 0, 0.04);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--vn-red), var(--vn-red-dark));
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    color: var(--vn-white);
    font-size: 1.25rem;
}

.feature-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--vn-dark);
    margin-bottom: 0.5rem;
}

.feature-card p {
    font-size: 0.875rem;
    color: var(--vn-gray);
    margin-bottom: 0;
    line-height: 1.5;
}

/* eSIM Card Styles */
.esim-card {
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.esim-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover) !important;
}

/* Navbar */
.navbar {
    background: var(--vn-dark) !important;
    padding: 0.75rem 0;
}

.navbar-brand span {
    font-size: 1.125rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.navbar .btn-outline-light.active {
    background: rgba(255, 255, 255, 0.12);
    border-color: var(--vn-white);
}

.navbar .btn-esim.active {
    background: var(--vn-red-light);
}

/* Footer */
.site-footer {
    background: var(--vn-dark);
    color: var(--vn-white);
    padding: 2rem 0;
    position: relative;
    font-size: 0.9375rem;
}

.site-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--vn-red), var(--vn-yellow), var(--vn-accent));
}

.site-footer a {
    color: rgba(255, 255, 255, 0.75);
    transition: color var(--transition-fast);
}

.site-footer a:hover {
    color: var(--vn-white);
}

/* Form Controls */
.form-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--vn-dark);
    margin-bottom: 0.5rem;
}

.form-control, .form-select {
    font-size: 0.9375rem;
    padding: 0.625rem 0.875rem;
    min-height: 46px;
    border-radius: 8px;
    border: 1px solid rgba(0, 0, 0, 0.12);
    background-color: var(--vn-white);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--vn-red);
    box-shadow: 0 0 0 3px rgba(217, 32, 56, 0.12);
}

.form-control::placeholder {
    color: var(--vn-gray-light);
}

.form-select {
    padding-right: 2.5rem;
    background-position: right 0.75rem center;
}

/* Badges - Refined */
.badge {
    font-weight: 500;
    letter-spacing: 0;
    padding: 0.35em 0.65em;
    border-radius: 6px;
}

.badge.bg-green-lt {
    background: rgba(39, 174, 96, 0.12) !important;
    color: #1E8449 !important;
}

.badge.bg-blue-lt {
    background: rgba(52, 152, 219, 0.12) !important;
    color: #2471A3 !important;
}

.badge.bg-orange-lt {
    background: rgba(243, 156, 18, 0.12) !important;
    color: #B7950B !important;
}

.badge.bg-red-lt {
    background: rgba(231, 76, 60, 0.12) !important;
    color: #C0392B !important;
}

/* Progress Bar */
.progress {
    background: rgba(0, 0, 0, 0.06);
    border-radius: 8px;
    overflow: hidden;
    height: 8px;
}

.progress-bar {
    border-radius: 8px;
    transition: width 0.4s ease;
}

.progress-bar.bg-success { background: #27AE60 !important; }
.progress-bar.bg-warning { background: #F39C12 !important; }
.progress-bar.bg-danger { background: #E74C3C !important; }

/* Accordion - Clean */
.accordion-item {
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 8px !important;
    margin-bottom: 0.5rem;
    overflow: hidden;
}

.accordion-button {
    font-weight: 500;
    color: var(--vn-dark);
    padding: 1rem 1.25rem;
}

.accordion-button:not(.collapsed) {
    background-color: rgba(217, 32, 56, 0.04);
    color: var(--vn-red-dark);
    box-shadow: none;
}

.accordion-button:focus {
    box-shadow: 0 0 0 3px rgba(217, 32, 56, 0.12);
    border-color: transparent;
}

.accordion-body {
    padding: 1rem 1.25rem;
    color: var(--vn-gray);
    line-height: 1.65;
}

/* Alerts */
.alert {
    font-size: 0.9375rem;
    padding: 1rem 1.25rem;
    border-radius: 10px;
    border: none;
}

.alert-success {
    background-color: rgba(39, 174, 96, 0.1);
    color: #1E8449;
}

.alert-danger {
    background-color: rgba(231, 76, 60, 0.1);
    color: #C0392B;
}

/* Spinner */
.spinner-border.text-primary {
    color: var(--vn-red) !important;
}

.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(217, 32, 56, 0.2);
    border-radius: 50%;
    border-top-color: var(--vn-red);
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Modal */
.modal-content {
    border-radius: 14px;
    border: none;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    border-radius: 14px 14px 0 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

/* QR Code */
.qr-code {
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    padding: 1rem;
    background: var(--vn-white);
}

/* Monospace */
.font-monospace {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    background: var(--vn-light);
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    word-break: break-all;
}

/* List Items */
ul li, ol li {
    margin-bottom: 0.375rem;
    line-height: 1.6;
}

/* Utilities */
.shadow-sm { box-shadow: var(--shadow-sm) !important; }
.shadow { box-shadow: var(--shadow-md) !important; }
.shadow-lg { box-shadow: var(--shadow-lg) !important; }

/* Trust Indicators */
.trust-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 50px;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--vn-dark);
    box-shadow: var(--shadow-sm);
}

/* Price Display */
.price-display {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--vn-red);
    letter-spacing: -0.02em;
}

/* Smooth Scrolling */
@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

/* Focus States for Accessibility */
:focus-visible {
    outline: 2px solid var(--vn-red);
    outline-offset: 2px;
}

button:focus-visible,
a:focus-visible {
    outline: 2px solid var(--vn-red);
    outline-offset: 2px;
}