/* ===== CSS Variables ===== */
:root {
    --color-primary: #FFD600;
    --color-primary-hover: #FFC800;
    --color-dark: #1A1A1A;
    --color-text: #333333;
    --color-text-light: #666666;
    --color-bg: #FFFFFF;
    --color-bg-light: #F5F5F5;
    --color-border: #E0E0E0;
    --color-white: #FFFFFF;

    --font-family: 'Inter', sans-serif;
    --font-size-base: 16px;
    --font-size-sm: 14px;
    --font-size-xs: 12px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-2xl: 32px;
    --font-size-3xl: 42px;
    --font-size-4xl: 56px;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 50%;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);

    --transition: 0.3s ease;
    --max-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

ul, ol {
    list-style: none;
}

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    outline: none;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
    outline: none;
}

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

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
    color: var(--color-dark);
    line-height: 1.2;
    font-weight: 700;
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    cursor: pointer;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-dark);
    border: 2px solid var(--color-primary);
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(255, 214, 0, 0.4);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-dark);
    border: 2px solid var(--color-dark);
}

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

.btn-outline-white {
    background-color: transparent;
    color: var(--color-white);
    border: 2px solid var(--color-white);
}

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

/* ===== Header ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    padding: 0 0;
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.logo-img {
    height: 48px;
    width: auto;
    object-fit: contain;
    border-radius: 6px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background-color: var(--color-primary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.logo-icon svg {
    width: 24px;
    height: 24px;
}

.logo-text {
    font-size: var(--font-size-lg);
    font-weight: 800;
    color: var(--color-dark);
    line-height: 1.1;
    letter-spacing: -0.5px;
}

.logo-text span {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 700;
    letter-spacing: 1px;
}

/* Navigation */
.nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 28px;
}

.nav-link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text);
    position: relative;
    padding: 4px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width var(--transition);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link.active {
    color: var(--color-dark);
    font-weight: 600;
}

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

.nav-cta {
    padding: 10px 24px;
    font-size: var(--font-size-sm);
}

@media (max-width: 1200px) {
    .nav {
        gap: 16px;
    }
    .nav-list {
        gap: 16px;
    }
    .nav-cta {
        padding: 8px 16px;
    }
}

/* Burger menu */
.burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    z-index: 1001;
}

.burger span {
    width: 24px;
    height: 2px;
    background-color: var(--color-dark);
    transition: all var(--transition);
    border-radius: 2px;
}

.burger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.burger.active span:nth-child(2) {
    opacity: 0;
}

.burger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== Breadcrumbs ===== */
.breadcrumbs {
    padding: 16px 0;
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

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

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

.breadcrumbs span {
    margin: 0 8px;
    color: var(--color-border);
}

.breadcrumbs .current {
    color: var(--color-dark);
    font-weight: 500;
}

/* ===== Page Header ===== */
.page-header {
    padding: 40px 0 50px;
}

.page-header h1 {
    font-size: var(--font-size-3xl);
    margin-bottom: 12px;
}

.page-header p {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    max-width: 600px;
}

/* ===== Footer ===== */
.footer {
    background-color: var(--color-dark);
    color: var(--color-white);
    padding: 50px 0 30px;
    margin-top: 80px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
    text-decoration: none;
}

.footer-logo .logo-img {
    height: 48px;
    width: auto;
    object-fit: contain;
    border-radius: 6px;
}

.footer-logo .logo-icon {
    width: 36px;
    height: 36px;
}

.footer-logo .logo-text {
    color: var(--color-white);
    font-size: var(--font-size-base);
}

.footer-logo .logo-text span {
    font-size: var(--font-size-xs);
}

.footer-desc {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.7;
    max-width: 300px;
}

.footer-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: 20px;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
    transition: color var(--transition);
}

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

.footer-contact-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 14px;
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
}

.footer-contact-item svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    margin-top: 2px;
    fill: var(--color-primary);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: var(--font-size-xs);
    color: rgba(255, 255, 255, 0.4);
}

/* ===== Section ===== */
.section {
    padding: 70px 0;
}

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

.section-title {
    font-size: var(--font-size-2xl);
    margin-bottom: 16px;
    text-align: center;
}

.section-subtitle {
    font-size: var(--font-size-base);
    color: var(--color-text-light);
    text-align: center;
    margin-bottom: 48px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== Responsive ===== */
@media (max-width: 992px) {
    h1 { font-size: var(--font-size-3xl); }
    h2 { font-size: var(--font-size-2xl); }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    h1 { font-size: var(--font-size-2xl); }
    h2 { font-size: var(--font-size-xl); }
    
    .burger {
        display: flex;
    }

    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 300px;
        height: 100vh;
        background-color: var(--color-white);
        flex-direction: column;
        align-items: flex-start;
        padding: 100px 30px 30px;
        gap: 0;
        box-shadow: -5px 0 20px rgba(0, 0, 0, 0.1);
        transition: right var(--transition);
    }

    .nav.active {
        right: 0;
    }

    .nav-list {
        flex-direction: column;
        align-items: flex-start;
        gap: 20px;
        width: 100%;
    }

    .nav-link {
        font-size: var(--font-size-base);
    }

    .nav-cta {
        margin-top: 20px;
        width: 100%;
        text-align: center;
    }

    .section {
        padding: 50px 0;
    }

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

@media (max-width: 480px) {
    h1 { font-size: var(--font-size-xl); }
    
    .container {
        padding: 0 16px;
    }

    .btn {
        padding: 10px 20px;
        font-size: var(--font-size-xs);
    }
}