/**
 * Keybaht Design System
 * โทน: ขาว · ฟ้าแซม (logo) · ดำ — เรียบง่าย ทันสมัย
 */

:root {
    /* Brand — จากโลโก้ Keybaht */
    --kb-blue: #00a0e9;
    --kb-blue-dark: #0088c7;
    --kb-blue-darker: #006da3;
    --kb-blue-light: #e8f6fd;
    --kb-blue-muted: #b8e4f7;
    --kb-black: #111111;
    --kb-gray-900: #1a1a1a;
    --kb-gray-700: #374151;
    --kb-gray-500: #6b7280;
    --kb-gray-400: #9ca3af;
    --kb-white: #ffffff;
    --kb-bg: #fafcfe;
    --kb-surface: #ffffff;
    --kb-border: #e5edf3;
    --kb-border-light: #f0f4f8;

    /* Legacy aliases (style.css) */
    --primary-color: var(--kb-blue);
    --secondary-color: var(--kb-blue-light);
    --text-color: var(--kb-gray-900);
    --border-radius: 10px;
    --nav-shadow: 0 1px 0 var(--kb-border), 0 4px 24px rgba(0, 0, 0, 0.04);

    /* Bootstrap 5 overrides */
    --bs-primary: #00a0e9;
    --bs-primary-rgb: 0, 160, 233;
    --bs-secondary: #6b7280;
    --bs-secondary-rgb: 107, 114, 128;
    --bs-body-font-family: 'IBM Plex Sans Thai', 'Sarabun', system-ui, sans-serif;
    --bs-body-color: #1a1a1a;
    --bs-body-bg: #fafcfe;
    --bs-link-color: #00a0e9;
    --bs-link-hover-color: #0088c7;
    --bs-border-color: #e5edf3;
    --bs-border-radius: 10px;
    --bs-border-radius-sm: 8px;
    --bs-border-radius-lg: 14px;
    --bs-focus-ring-color: rgba(0, 160, 233, 0.25);
}

/* ── Typography ── */
body {
    font-family: var(--bs-body-font-family);
    color: var(--kb-gray-900);
    background-color: var(--kb-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6,
.h1, .h2, .h3, .h4, .h5, .h6 {
    color: var(--kb-black);
    font-weight: 600;
    letter-spacing: -0.02em;
}

.text-muted {
    color: var(--kb-gray-500) !important;
}

/* ── Bootstrap buttons ── */
.btn {
    font-weight: 500;
    border-radius: var(--bs-border-radius-sm);
    letter-spacing: 0.01em;
}

.btn-primary {
    --bs-btn-bg: var(--kb-blue);
    --bs-btn-border-color: var(--kb-blue);
    --bs-btn-hover-bg: var(--kb-blue-dark);
    --bs-btn-hover-border-color: var(--kb-blue-dark);
    --bs-btn-active-bg: var(--kb-blue-darker);
    --bs-btn-active-border-color: var(--kb-blue-darker);
    --bs-btn-focus-shadow-rgb: 0, 160, 233;
}

.btn-outline-primary {
    --bs-btn-color: var(--kb-blue);
    --bs-btn-border-color: var(--kb-blue);
    --bs-btn-hover-bg: var(--kb-blue);
    --bs-btn-hover-border-color: var(--kb-blue);
    --bs-btn-active-bg: var(--kb-blue-dark);
    --bs-btn-active-border-color: var(--kb-blue-dark);
}

.btn-outline-secondary {
    --bs-btn-color: var(--kb-gray-700);
    --bs-btn-border-color: var(--kb-border);
    --bs-btn-hover-bg: var(--kb-black);
    --bs-btn-hover-border-color: var(--kb-black);
    --bs-btn-hover-color: var(--kb-white);
}

.text-primary {
    color: var(--kb-blue) !important;
}

.bg-primary {
    background-color: var(--kb-blue) !important;
}

.border-primary {
    border-color: var(--kb-blue) !important;
}

/* ── Forms ── */
.form-control,
.form-select {
    border-color: var(--kb-border);
    border-radius: var(--bs-border-radius-sm);
    color: var(--kb-gray-900);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--kb-blue);
    box-shadow: 0 0 0 0.2rem rgba(0, 160, 233, 0.15);
}

/* ── Cards ── */
.card {
    border-color: var(--kb-border-light);
    border-radius: var(--bs-border-radius-lg);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

/* ── Navbar ── */
.navbar {
    background-color: rgba(255, 255, 255, 0.92) !important;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--kb-border-light);
    box-shadow: var(--nav-shadow);
}

.navbar-brand {
    color: var(--kb-black) !important;
    font-weight: 700;
    letter-spacing: -0.03em;
}

.navbar-brand:hover {
    color: var(--kb-blue) !important;
}

.nav-link {
    color: var(--kb-gray-700) !important;
    font-weight: 500;
}

.nav-link:hover {
    color: var(--kb-blue) !important;
    background-color: var(--kb-blue-light) !important;
}

.nav-link.active {
    color: var(--kb-blue) !important;
    background-color: var(--kb-blue-light) !important;
}

.hamburger,
.hamburger::before,
.hamburger::after {
    background: var(--kb-black) !important;
}

/* ── Section titles ── */
.section-title {
    color: var(--kb-black) !important;
    font-weight: 700;
    letter-spacing: -0.03em;
    text-align: left;
}

.section-title::after {
    content: '';
    display: block;
    width: 40px;
    height: 3px;
    background: var(--kb-blue);
    border-radius: 2px;
    margin-top: 0.5rem;
}

.sidebar-title {
    color: var(--kb-black) !important;
    font-weight: 600;
    letter-spacing: -0.02em;
}

/* ── Sidebar & surfaces ── */
.sidebar-section {
    background: var(--kb-surface);
    border: 1px solid var(--kb-border-light);
    border-radius: var(--bs-border-radius-lg);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.article-card,
.feature-item {
    border: 1px solid var(--kb-border-light);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.article-content h3,
.feature-content h3 {
    color: var(--kb-black) !important;
}

/* ── Slider ── */
.slider-container {
    background: linear-gradient(135deg, var(--kb-blue-light) 0%, var(--kb-white) 100%) !important;
    border: 1px solid var(--kb-border-light);
    box-shadow: 0 1px 3px rgba(0, 160, 233, 0.06) !important;
}

.slider-dot.active {
    background: var(--kb-blue) !important;
}

/* ── Links & accents ── */
.category-list a:hover {
    color: var(--kb-blue) !important;
}

.btn-signup {
    background: var(--kb-blue) !important;
    border-radius: var(--bs-border-radius-sm);
}

.btn-signup:hover {
    background: var(--kb-blue-dark) !important;
}

.article-link:hover .read-more {
    color: var(--kb-blue) !important;
}

.footer-logo {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.footer {
    background: var(--kb-white) !important;
    border-top: 1px solid var(--kb-border) !important;
}

.footer-heading {
    color: var(--kb-black);
}

.footer-text {
    color: var(--kb-gray-700);
}

.footer-link {
    color: var(--kb-gray-700);
    transition: color 0.2s ease;
}

.footer-link:hover {
    color: var(--kb-blue);
}

.newsletter-form .form-control:focus {
    border-color: var(--kb-blue);
    box-shadow: 0 0 0 0.15rem rgba(0, 160, 233, 0.12);
}

/* ── Badges ── */
.badge.bg-primary {
    background-color: var(--kb-blue) !important;
}

/* ── Dropdown ── */
.dropdown-item:active {
    background-color: var(--kb-blue);
}

/* ── Pagination ── */
.page-link {
    color: var(--kb-blue);
}

.page-item.active .page-link {
    background-color: var(--kb-blue);
    border-color: var(--kb-blue);
}

/* ── Auth pages gradient headers ── */
.card-header.bg-primary,
.register-card .card-header {
    background: linear-gradient(135deg, var(--kb-blue) 0%, var(--kb-blue-dark) 100%) !important;
}