/* ============================================
   MAIN CSS - Design System
   An Phát Hardware B2B Theme
   ============================================ */

/* --- CSS Reset / Normalize --- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    font-size: var(--fs-base);
    font-weight: var(--fw-normal);
    line-height: var(--lh-normal);
    color: var(--color-text-main);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: var(--color-primary);
    transition: color var(--transition-fast);
}

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

ul, ol {
    list-style: none;
}

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    color: inherit;
}

button {
    cursor: pointer;
    border: none;
    background: none;
}

table {
    border-collapse: collapse;
    width: 100%;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: var(--fw-bold);
    line-height: var(--lh-tight);
    color: var(--color-text-main);
    margin-bottom: var(--space-4);
}

h1 { font-size: var(--fs-4xl); }
h2 { font-size: var(--fs-3xl); }
h3 { font-size: var(--fs-2xl); }
h4 { font-size: var(--fs-xl); }
h5 { font-size: var(--fs-lg); }
h6 { font-size: var(--fs-md); }

p {
    margin-bottom: var(--space-4);
    color: var(--color-text-light);
}

p:last-child {
    margin-bottom: 0;
}

strong, b {
    font-weight: var(--fw-semibold);
}

/* --- Layout --- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.container--narrow {
    max-width: var(--container-narrow);
}

.container--wide {
    max-width: var(--container-wide);
}

.section {
    padding: var(--space-20) 0;
}

.section--gray {
    background-color: var(--color-bg-light);
}

.section--dark {
    background-color: var(--color-primary-darker);
    color: var(--color-white);
}

.section--dark h2,
.section--dark h3,
.section--dark p {
    color: var(--color-white);
}

.section--dark p {
    opacity: 0.85;
}

/* Section Header */
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--space-12);
}

.section-header__label {
    display: inline-block;
    font-size: var(--fs-sm);
    font-weight: var(--fw-semibold);
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: var(--space-3);
}

.section-header__title {
    font-size: var(--fs-3xl);
    margin-bottom: var(--space-4);
    position: relative;
}

.section-header__title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    margin: var(--space-4) auto 0;
    border-radius: var(--radius-full);
}

.section-header__desc {
    font-size: var(--fs-md);
    color: var(--color-text-light);
}

/* Grid System */
.grid {
    display: grid;
    gap: var(--space-6);
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--6 { grid-template-columns: repeat(6, 1fr); }

/* Flexbox Utilities */
.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-col { flex-direction: column; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-family: var(--font-heading);
    font-size: var(--fs-sm);
    font-weight: var(--fw-semibold);
    letter-spacing: 0.5px;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    cursor: pointer;
    border: 2px solid transparent;
    text-transform: uppercase;
    white-space: nowrap;
}

.btn--lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--fs-base);
}

.btn--xl {
    padding: var(--space-5) var(--space-10);
    font-size: var(--fs-md);
}

.btn--primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: var(--color-white);
    box-shadow: var(--shadow-primary);
}

.btn--primary:hover {
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(30, 136, 229, 0.45);
    color: var(--color-white);
}

.btn--accent {
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-dark));
    color: var(--color-white);
    box-shadow: var(--shadow-accent);
}

.btn--accent:hover {
    background: linear-gradient(135deg, var(--color-accent-light), var(--color-accent));
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 167, 38, 0.45);
    color: var(--color-white);
}

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

.btn--outline:hover {
    background: var(--color-white);
    color: var(--color-primary);
    transform: translateY(-2px);
}

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

.btn--outline-primary:hover {
    background: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-primary);
}

.btn--ghost {
    background: transparent;
    color: var(--color-primary);
    padding: var(--space-2) var(--space-4);
}

.btn--ghost:hover {
    background: rgba(var(--color-primary-rgb), 0.08);
}

.btn--icon {
    width: 44px;
    height: 44px;
    padding: 0;
    border-radius: var(--radius-full);
}

.btn svg,
.btn i {
    width: 18px;
    height: 18px;
}

/* --- Cards --- */
.card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--color-border-light);
}

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

.card__image {
    width: 100%;
    aspect-ratio: 4/3;
    object-fit: cover;
    background-color: var(--color-bg-light);
}

.card__body {
    padding: var(--space-5);
}

.card__tag {
    display: inline-block;
    font-size: var(--fs-xs);
    font-weight: var(--fw-semibold);
    color: var(--color-primary);
    background: rgba(var(--color-primary-rgb), 0.08);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-3);
}

.card__title {
    font-family: var(--font-heading);
    font-size: var(--fs-lg);
    font-weight: var(--fw-semibold);
    color: var(--color-text-main);
    margin-bottom: var(--space-2);
    line-height: var(--lh-snug);
}

.card__title a {
    color: inherit;
}

.card__title a:hover {
    color: var(--color-primary);
}

.card__desc {
    font-size: var(--fs-sm);
    color: var(--color-text-light);
    margin-bottom: var(--space-4);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card__meta {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
}

.card__footer {
    padding: var(--space-4) var(--space-5);
    border-top: 1px solid var(--color-border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* --- Badge --- */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--fs-xs);
    font-weight: var(--fw-semibold);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
}

.badge--primary {
    background: rgba(var(--color-primary-rgb), 0.1);
    color: var(--color-primary);
}

.badge--accent {
    background: rgba(var(--color-accent-rgb), 0.1);
    color: var(--color-accent-dark);
}

/* --- Forms --- */
.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    font-size: var(--fs-sm);
    font-weight: var(--fw-medium);
    color: var(--color-text-main);
    margin-bottom: var(--space-2);
}

.form-label .required {
    color: var(--color-error);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-white);
    font-size: var(--fs-base);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), 0.15);
}

.form-input::placeholder {
    color: var(--color-text-muted);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%235A6B7F' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: var(--space-10);
}

/* --- Tables --- */
.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--fs-sm);
}

.table th,
.table td {
    padding: var(--space-3) var(--space-4);
    text-align: left;
    border-bottom: 1px solid var(--color-border-light);
}

.table th {
    background-color: var(--color-primary);
    color: var(--color-white);
    font-weight: var(--fw-semibold);
    font-family: var(--font-heading);
    font-size: var(--fs-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.table tbody tr:nth-child(even) {
    background-color: var(--color-bg-light);
}

.table tbody tr:hover {
    background-color: rgba(var(--color-primary-rgb), 0.04);
}

/* --- Breadcrumbs --- */
.breadcrumbs {
    padding: var(--space-4) 0;
    font-size: var(--fs-sm);
}

.breadcrumbs__list {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.breadcrumbs__item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--color-text-muted);
}

.breadcrumbs__item a {
    color: var(--color-text-light);
}

.breadcrumbs__item a:hover {
    color: var(--color-primary);
}

.breadcrumbs__separator {
    font-size: var(--fs-xs);
    color: var(--color-gray-400);
}

.breadcrumbs__item--active {
    color: var(--color-primary);
    font-weight: var(--fw-medium);
}

/* --- Pagination --- */
.pagination,
.navigation.pagination {
    margin-top: var(--space-10);
    margin-bottom: var(--space-6);
}

.pagination .nav-links,
.nav-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.pagination .nav-links a,
.pagination .nav-links span,
.nav-links a,
.nav-links span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 42px;
    height: 42px;
    padding: 0 var(--space-3);
    border-radius: var(--radius-md);
    font-size: var(--fs-sm);
    font-weight: var(--fw-medium);
    color: var(--color-text-main);
    background: var(--color-white);
    border: 1px solid var(--color-border);
    transition: all var(--transition-fast);
    text-decoration: none;
    line-height: 1;
}

.pagination .nav-links a:hover,
.nav-links a:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.pagination .nav-links .current,
.nav-links .current,
.pagination .current {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: var(--color-white);
    border-color: var(--color-primary);
    font-weight: var(--fw-semibold);
    box-shadow: var(--shadow-primary);
}

.pagination .nav-links .dots,
.nav-links .dots {
    border: none;
    background: transparent;
    color: var(--color-text-muted);
    min-width: 32px;
    padding: 0;
    letter-spacing: 2px;
}

.pagination .nav-links .prev,
.pagination .nav-links .next,
.nav-links .prev,
.nav-links .next {
    font-weight: var(--fw-semibold);
    padding: 0 var(--space-4);
    gap: var(--space-1);
    color: var(--color-primary);
    border-color: var(--color-primary);
    background: rgba(var(--color-primary-rgb), 0.04);
}

.pagination .nav-links .prev:hover,
.pagination .nav-links .next:hover,
.nav-links .prev:hover,
.nav-links .next:hover {
    background: var(--color-primary);
    color: var(--color-white);
}

/* Screen reader text hidden */
.navigation .screen-reader-text {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* --- Utility Classes --- */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--color-primary); }
.text-accent { color: var(--color-accent); }
.text-muted { color: var(--color-text-muted); }
.text-white { color: var(--color-white); }

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

.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }
.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: var(--space-4); }
.mb-8 { margin-bottom: var(--space-8); }

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* --- Animations --- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

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

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

@keyframes scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* Animate on scroll - will be triggered via JS IntersectionObserver */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.animate-on-scroll.animate-left {
    transform: translateX(-30px);
}

.animate-on-scroll.animate-left.is-visible {
    transform: translateX(0);
}

.animate-on-scroll.animate-right {
    transform: translateX(30px);
}

.animate-on-scroll.animate-right.is-visible {
    transform: translateX(0);
}

.animate-on-scroll.animate-scale {
    transform: scale(0.9);
}

.animate-on-scroll.animate-scale.is-visible {
    transform: scale(1);
}

/* Staggered animation delay children */
.stagger-children > *:nth-child(1) { transition-delay: 0ms; }
.stagger-children > *:nth-child(2) { transition-delay: 100ms; }
.stagger-children > *:nth-child(3) { transition-delay: 200ms; }
.stagger-children > *:nth-child(4) { transition-delay: 300ms; }
.stagger-children > *:nth-child(5) { transition-delay: 400ms; }
.stagger-children > *:nth-child(6) { transition-delay: 500ms; }
.stagger-children > *:nth-child(7) { transition-delay: 600ms; }
.stagger-children > *:nth-child(8) { transition-delay: 700ms; }

/* --- Overlay --- */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: var(--z-overlay);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.overlay.is-active {
    opacity: 1;
    visibility: visible;
}

/* --- Scrollbar Custom --- */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-light);
}

::-webkit-scrollbar-thumb {
    background: var(--color-gray-400);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-gray-500);
}

/* --- Selection --- */
::selection {
    background: rgba(var(--color-primary-rgb), 0.2);
    color: var(--color-primary-dark);
}