/* public/css/base.css - CSS tái sử dụng */
:root {
    /* Colors */
    --primary-color: #00d4ff;
    --primary-dark: #00b8e6;
    --primary-light: #33dcff;
    --secondary-color: #ff6b35;
    --accent-color: #7c3aed;

    /* Dark Theme Colors */
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2a2a2a;
    --bg-card: #1e1e1e;
    --bg-overlay: rgba(0, 0, 0, 0.8);

    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --text-muted: #666666;
    --text-accent: var(--primary-color);

    /* Border Colors */
    --border-primary: #333333;
    --border-secondary: #444444;
    --border-accent: var(--primary-color);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    --gradient-secondary: linear-gradient(135deg, var(--secondary-color) 0%, #ff8a65 100%);
    --gradient-dark: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);

    /* Spacing */
    --container-max-width: 1200px;
    --section-padding: 80px 0;
    --card-padding: 30px;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-2xl: 32px;
    --font-size-3xl: 48px;
    --font-size-4xl: 64px;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.6);

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

/* Container */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 16px;
}

h1 {
    font-size: var(--font-size-3xl);
}

h2 {
    font-size: var(--font-size-2xl);
}

h3 {
    font-size: var(--font-size-xl);
}

h4 {
    font-size: var(--font-size-lg);
}

p {
    margin-bottom: 16px;
    color: var(--text-secondary);
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-title {
    font-size: var(--font-size-2xl);
    text-align: center;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 50px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: var(--font-size-base);
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition-normal);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--border-secondary);
}

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

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

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

.btn-sm {
    padding: 8px 16px;
    font-size: var(--font-size-sm);
}

.btn-large {
    padding: 16px 32px;
    font-size: var(--font-size-lg);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-primary);
}

.navbar {
    padding: 16px 0;
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
}

.brand-link {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: var(--font-size-xl);
    font-weight: 800;
    color: var(--text-primary);
}

.brand-logo {
    width: 40px;
    height: 40px;
}

.nav-menu {
    display: flex;
    align-items: center;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition-fast);
}

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

.nav-link.active {
    /* Nền xám đậm */
    border-bottom: 2px solid #8d2cfc;
    font-weight: 600;
    border-radius: 6px 6px 0 0;
    /* Bo góc trên */
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.hamburger {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-fast);
    position: relative;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-fast);
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    top: 8px;
}

/* Footer */
.footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-primary);
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand h3 {
    font-size: var(--font-size-xl);
    margin-bottom: 16px;
    color: var(--text-primary);
}

.footer-brand p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.footer-logo {
    width: 50px;
    height: 50px;
    margin-bottom: 16px;
}

.footer-stats {
    display: flex;
    gap: 30px;
}

.footer-section h4 {
    font-size: var(--font-size-lg);
    margin-bottom: 20px;
    color: var(--text-primary);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

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

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.contact-item i {
    color: var(--primary-color);
    width: 20px;
}

.contact-item a {
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

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

.footer-bottom {
    border-top: 1px solid var(--border-primary);
    padding-top: 20px;
}

.footer-bottom-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-bottom p {
    color: var(--text-muted);
    margin: 0;
}

.footer-bottom .footer-links {
    flex-direction: row;
    gap: 20px;
}

/* Grid Systems */
.grid {
    display: grid;
    gap: 30px;
}

.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-auto {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

/* Cards */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-primary);
    padding: var(--card-padding);
    transition: var(--transition-normal);
}

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

/* Sections */
.section {
    padding: var(--section-padding);
}

.section-primary {
    background: var(--bg-primary)!important;
}

.section-secondary {
    background: var(--bg-secondary);
}

/* Animations */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-in-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: all 0.6s ease;
}

.fade-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.fade-in-right {
    opacity: 0;
    transform: translateX(30px);
    transition: all 0.6s ease;
}

.fade-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

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

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.mb-0 {
    margin-bottom: 0;
}

.mb-1 {
    margin-bottom: 8px;
}

.mb-2 {
    margin-bottom: 16px;
}

.mb-3 {
    margin-bottom: 24px;
}

.mb-4 {
    margin-bottom: 32px;
}

.mb-5 {
    margin-bottom: 40px;
}

.mt-0 {
    margin-top: 0;
}

.mt-1 {
    margin-top: 8px;
}

.mt-2 {
    margin-top: 16px;
}

.mt-3 {
    margin-top: 24px;
}

.mt-4 {
    margin-top: 32px;
}

.mt-5 {
    margin-top: 40px;
}

.hidden {
    display: none;
}

.visible {
    display: block;
}

/* Responsive */
@media (max-width: 768px) {
    :root {
        --font-size-3xl: 36px;
        --font-size-2xl: 28px;
        --font-size-xl: 20px;
        --section-padding: 60px 0;
        --card-padding: 20px;
    }

    .container {
        padding: 0 16px;
    }

    .nav-menu {
        position: fixed;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        border-top: 1px solid var(--border-primary);
        padding: 20px;
        transform: translateY(-100%);
        transition: var(--transition-normal);
        opacity: 0;
        visibility: hidden;
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-list {
        flex-direction: column;
        gap: 20px; 
    }

    .nav-actions {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .footer-stats {
        justify-content: center;
    }

    .footer-bottom-content {
        flex-direction: column;
        text-align: center;
    }
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: var(--font-size-xl);
    font-weight: 800;
    color: var(--primary-color);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

/* Utility classes for margin and padding */

/* Margin classes */
[class*="m-"] {
    margin: 0 !important;
}

.m-0 {
    margin: 0 !important;
}

.m-1 {
    margin: 0.25rem !important;
}

.m-2 {
    margin: 0.5rem !important;
}

.m-3 {
    margin: 1rem !important;
}

.m-4 {
    margin: 1.5rem !important;
}

.m-5 {
    margin: 3rem !important;
}

/* Margin top */
.mt-0 {
    margin-top: 0 !important;
}

.mt-1 {
    margin-top: 0.25rem !important;
}

.mt-2 {
    margin-top: 0.5rem !important;
}

.mt-3 {
    margin-top: 1rem !important;
}

.mt-4 {
    margin-top: 1.5rem !important;
}

.mt-5 {
    margin-top: 3rem !important;
}

/* Margin bottom */
.mb-0 {
    margin-bottom: 0 !important;
}

.mb-1 {
    margin-bottom: 0.25rem !important;
}

.mb-2 {
    margin-bottom: 0.5rem !important;
}

.mb-3 {
    margin-bottom: 1rem !important;
}

.mb-4 {
    margin-bottom: 1.5rem !important;
}

.mb-5 {
    margin-bottom: 3rem !important;
}

/* Margin left */
.ml-0 {
    margin-left: 0 !important;
}

.ml-1 {
    margin-left: 0.25rem !important;
}

.ml-2 {
    margin-left: 0.5rem !important;
}

.ml-3 {
    margin-left: 1rem !important;
}

.ml-4 {
    margin-left: 1.5rem !important;
}

.ml-5 {
    margin-left: 3rem !important;
}

/* Margin right */
.mr-0 {
    margin-right: 0 !important;
}

.mr-1 {
    margin-right: 0.25rem !important;
}

.mr-2 {
    margin-right: 0.5rem !important;
}

.mr-3 {
    margin-right: 1rem !important;
}

.mr-4 {
    margin-right: 1.5rem !important;
}

.mr-5 {
    margin-right: 3rem !important;
}

/* Padding classes */
[class*="p-"] {
    padding: 0 !important;
}

.p-0 {
    padding: 0 !important;
}

.p-1 {
    padding: 0.25rem !important;
}

.p-2 {
    padding: 0.5rem !important;
}

.p-3 {
    padding: 1rem !important;
}

.p-4 {
    padding: 1.5rem !important;
}

.p-5 {
    padding: 3rem !important;
}

/* Padding top */
.pt-0 {
    padding-top: 0 !important;
}

.pt-1 {
    padding-top: 0.25rem !important;
}

.pt-2 {
    padding-top: 0.5rem !important;
}

.pt-3 {
    padding-top: 1rem !important;
}

.pt-4 {
    padding-top: 1.5rem !important;
}

.pt-5 {
    padding-top: 3rem !important;
}

/* Padding bottom */
.pb-0 {
    padding-bottom: 0 !important;
}

.pb-1 {
    padding-bottom: 0.25rem !important;
}

.pb-2 {
    padding-bottom: 0.5rem !important;
}

.pb-3 {
    padding-bottom: 1rem !important;
}

.pb-4 {
    padding-bottom: 1.5rem !important;
}

.pb-5 {
    padding-bottom: 3rem !important;
}

/* Padding left */
.pl-0 {
    padding-left: 0 !important;
}

.pl-1 {
    padding-left: 0.25rem !important;
}

.pl-2 {
    padding-left: 0.5rem !important;
}

.pl-3 {
    padding-left: 1rem !important;
}

.pl-4 {
    padding-left: 1.5rem !important;
}

.pl-5 {
    padding-left: 3rem !important;
}

/* Padding right */
.pr-0 {
    padding-right: 0 !important;
}

.pr-1 {
    padding-right: 0.25rem !important;
}

.pr-2 {
    padding-right: 0.5rem !important;
}

.pr-3 {
    padding-right: 1rem !important;
}

.pr-4 {
    padding-right: 1.5rem !important;
}

.pr-5 {
    padding-right: 3rem !important;
}

/* X-axis (left and right) */
.mx-0 {
    margin-left: 0 !important;
    margin-right: 0 !important;
}

.mx-1 {
    margin-left: 0.25rem !important;
    margin-right: 0.25rem !important;
}

.mx-2 {
    margin-left: 0.5rem !important;
    margin-right: 0.5rem !important;
}

.mx-3 {
    margin-left: 1rem !important;
    margin-right: 1rem !important;
}

.mx-4 {
    margin-left: 1.5rem !important;
    margin-right: 1.5rem !important;
}

.mx-5 {
    margin-left: 3rem !important;
    margin-right: 3rem !important;
}

/* Y-axis (top and bottom) */
.my-0 {
    margin-top: 0 !important;
    margin-bottom: 0 !important;
}

.my-1 {
    margin-top: 0.25rem !important;
    margin-bottom: 0.25rem !important;
}

.my-2 {
    margin-top: 0.5rem !important;
    margin-bottom: 0.5rem !important;
}

.my-3 {
    margin-top: 1rem !important;
    margin-bottom: 1rem !important;
}

.my-4 {
    margin-top: 1.5rem !important;
    margin-bottom: 1.5rem !important;
}

.my-5 {
    margin-top: 3rem !important;
    margin-bottom: 3rem !important;
}

/* Padding X-axis (left and right) */
.px-0 {
    padding-left: 0 !important;
    padding-right: 0 !important;
}

.px-1 {
    padding-left: 0.25rem !important;
    padding-right: 0.25rem !important;
}

.px-2 {
    padding-left: 0.5rem !important;
    padding-right: 0.5rem !important;
}

.px-3 {
    padding-left: 1rem !important;
    padding-right: 1rem !important;
}

.px-4 {
    padding-left: 1.5rem !important;
    padding-right: 1.5rem !important;
}

.px-5 {
    padding-left: 3rem !important;
    padding-right: 3rem !important;
}

/* Padding Y-axis (top and bottom) */
.py-0 {
    padding-top: 0 !important;
    padding-bottom: 0 !important;
}

.py-1 {
    padding-top: 0.25rem !important;
    padding-bottom: 0.25rem !important;
}

.py-2 {
    padding-top: 0.5rem !important;
    padding-bottom: 0.5rem !important;
}

.py-3 {
    padding-top: 1rem !important;
    padding-bottom: 1rem !important;
}

.py-4 {
    padding-top: 1.5rem !important;
    padding-bottom: 1.5rem !important;
}

.py-5 {
    padding-top: 3rem !important;
    padding-bottom: 3rem !important;
}

/* Display Flex Utilities */
.d-flex {
    display: flex !important;
}

.d-inline-flex {
    display: inline-flex !important;
}

.d-block {
    display: block !important;
}

.d-inline {
    display: inline !important;
}

.d-none {
    display: none !important;
}

/* Flex Direction */
.flex-row {
    flex-direction: row !important;
}

.flex-row-reverse {
    flex-direction: row-reverse !important;
}

.flex-column {
    flex-direction: column !important;
}

.flex-column-reverse {
    flex-direction: column-reverse !important;
}

/* Flex Wrap */
.flex-wrap {
    flex-wrap: wrap !important;
}

.flex-nowrap {
    flex-wrap: nowrap !important;
}

.flex-wrap-reverse {
    flex-wrap: wrap-reverse !important;
}

/* Justify Content */
.justify-start {
    justify-content: flex-start !important;
}

.justify-end {
    justify-content: flex-end !important;
}

.justify-center {
    justify-content: center !important;
}

.justify-between {
    justify-content: space-between !important;
}

.justify-around {
    justify-content: space-around !important;
}

.justify-evenly {
    justify-content: space-evenly !important;
}

/* Align Items */
.align-items-start {
    align-items: flex-start !important;
}

.align-items-end {
    align-items: flex-end !important;
}

.align-items-center {
    align-items: center !important;
}

.align-items-baseline {
    align-items: baseline !important;
}

.align-items-stretch {
    align-items: stretch !important;
}

/* Align Self */
.align-self-start {
    align-self: flex-start !important;
}

.align-self-end {
    align-self: flex-end !important;
}

.align-self-center {
    align-self: center !important;
}

.align-self-baseline {
    align-self: baseline !important;
}

.align-self-stretch {
    align-self: stretch !important;
}

/* Align Content */
.align-content-start {
    align-content: flex-start !important;
}

.align-content-end {
    align-content: flex-end !important;
}

.align-content-center {
    align-content: center !important;
}

.align-content-between {
    align-content: space-between !important;
}

.align-content-around {
    align-content: space-around !important;
}

.align-content-stretch {
    align-content: stretch !important;
}

/* Flex Grow */
.flex-grow-0 {
    flex-grow: 0 !important;
}

.flex-grow-1 {
    flex-grow: 1 !important;
}

/* Flex Shrink */
.flex-shrink-0 {
    flex-shrink: 0 !important;
}

.flex-shrink-1 {
    flex-shrink: 1 !important;
}

/* Order */
.order-0 {
    order: 0 !important;
}

.order-1 {
    order: 1 !important;
}

.order-2 {
    order: 2 !important;
}

.order-3 {
    order: 3 !important;
}

.order-4 {
    order: 4 !important;
}

.order-5 {
    order: 5 !important;
}

.order-first {
    order: -1 !important;
}

.order-last {
    order: 999 !important;
}
.hidden{
    display: none!important;
}