/**
 * BTS Clothing - Main Stylesheet
 * Clean, modern e-commerce design with CSS variables for easy brand customization
 * 
 * Font: Google Fonts Poppins
 * Colors: CSS variables for easy brand color replacement
 */

/* ============================================
   CSS VARIABLES - Brand Colors & Theme
   ============================================ */
:root {
    /* Brand Colors */
    --primary: #2c2c2c;          /* Dark neutral primary */
    --accent: #0151C4;            /* Primary blue accent */
    --accent-hover: #013A8F;      /* Darker blue for hover + text on white */
    --accent-outline: #FF7A01;    /* Orange for outlined/secondary buttons */
    --bg: #ffffff;                /* Clean white background */
    --text: #333333;              /* Dark text for readability */
    
    /* Additional Colors */
    --light-gray: #f8f9fa;
    --medium-gray: #e9ecef;
    --dark-gray: #495057;
    --success: #28a745;
    --danger: #dc3545;
    --warning: #ffc107;
    
    /* Typography */
    --font-family: 'Poppins', sans-serif;
    --font-size-base: 16px;
    --font-size-sm: 14px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-2xl: 32px;
    --font-size-3xl: 48px;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Transitions */
    --transition: all 0.3s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.15);
}

/* ============================================
   GLOBAL 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);
    color: var(--text);
    background-color: var(--bg);
    line-height: 1.6;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--primary);
}

h1 {
    font-size: var(--font-size-3xl);
    line-height: 1.2;
}

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

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

p {
    margin-bottom: var(--spacing-md);
}

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

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

/* ============================================
   NAVBAR / HEADER
   ============================================ */
.navbar {
    background-color: var(--bg);
    border-bottom: 1px solid var(--medium-gray);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.navbar-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-logo a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: var(--primary);
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary);
}

.logo-subtitle {
    font-size: var(--font-size-sm);
    color: var(--accent);
    font-weight: 500;
}

.nav-menu {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: var(--spacing-lg);
    flex: 1;
    margin-left: var(--spacing-2xl);
}

.nav-list {
    list-style: none;
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--text);
    font-weight: 500;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent);
    transition: width 0.3s ease;
}

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

.nav-auth {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-greeting {
    color: var(--text);
    font-weight: 500;
    font-size: var(--font-size-sm);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--primary);
    border-radius: 2px;
    transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

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

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(8px, -8px);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: 4px;
    font-family: var(--font-family);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-size: var(--font-size-sm);
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background-color: var(--accent);
    color: var(--bg);
}

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

.btn-secondary {
    background-color: var(--accent-outline);
    color: var(--bg);
    border: 2px solid var(--accent-outline);
}

.btn-secondary:hover {
    background-color: #E56A00;
    border-color: #E56A00;
}

.btn-logout {
    background-color: transparent;
    color: var(--text);
    border: 1px solid var(--medium-gray);
    padding: 8px 16px;
}

.btn-logout:hover {
    background-color: var(--light-gray);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
}

.btn-small {
    padding: 6px 12px;
    font-size: var(--font-size-sm);
}

/* ============================================
   CONTAINERS & SECTIONS
   ============================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

section {
    padding: var(--spacing-2xl) 0;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title h2 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
}

.section-title p {
    color: var(--dark-gray);
    font-size: var(--font-size-lg);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    background:
        linear-gradient(rgba(0,0,0,0.12), rgba(0,0,0,0.12)),
        linear-gradient(
            to right,
            #1577b8 0%, #1577b8 25%,
            #b8539e 25%, #b8539e 50%,
            #7b3a9e 50%, #7b3a9e 75%,
            #141f4d 75%, #141f4d 100%
        );
    color: #fff;
    padding: var(--spacing-2xl) var(--spacing-lg);
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 600px;
}

.hero-content {
    max-width: 900px;
}

.hero-eyebrow {
    font-size: var(--font-size-lg);
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #fff;
    margin-bottom: var(--spacing-sm);
}

.hero h1 {
    font-size: calc(var(--font-size-3xl) * 1.25);
    margin-bottom: var(--spacing-lg);
    color: #fff;
    line-height: 1.05;
    text-transform: uppercase;
    font-weight: 900;
    letter-spacing: -0.01em;
}

.hero p {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xl);
    color: #e0e0e0;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.hero .btn-primary,
.hero .btn-secondary {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
}

/* ============================================
   CARDS & GRID
   ============================================ */
.card {
    background-color: var(--bg);
    border: 1px solid var(--medium-gray);
    border-radius: 8px;
    overflow: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

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

.card-image {
    width: 100%;
    height: 250px;
    background-color: var(--light-gray);
    overflow: hidden;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.card:hover .card-image img {
    transform: scale(1.05);
}

.card-body {
    padding: var(--spacing-lg);
}

.card-title {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
}

.card-description {
    color: var(--dark-gray);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
}

.card-price {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--accent-hover);
    margin-bottom: var(--spacing-md);
}

.card-footer {
    display: flex;
    gap: var(--spacing-sm);
}

.grid {
    display: grid;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* ============================================
   CATEGORIES SECTION
   ============================================ */
.categories {
    background-color: var(--light-gray);
}

.category-card .card-image {
    height: 200px;
}

/* ============================================
   PRODUCTS SECTION
   ============================================ */
.products-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.filter-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.filter-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 2px solid var(--medium-gray);
    background-color: var(--bg);
    color: var(--text);
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-family);
    font-weight: 500;
}

.filter-btn:hover,
.filter-btn.active {
    background-color: var(--accent);
    color: var(--bg);
    border-color: var(--accent);
}

.product-card .card-image img {
    object-fit: contain;
}

.product-card .card-footer {
    flex-direction: column;
}

.product-card .btn {
    flex: 1;
    text-align: center;
}

/* ============================================
   WHY CHOOSE US SECTION
   ============================================ */
.why-choose-us {
    background-color: var(--light-gray);
}

.feature-card {
    text-align: center;
    padding: var(--spacing-xl);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-lg);
    line-height: 1;
}

.feature-card h3 {
    margin-bottom: var(--spacing-md);
}

.feature-card p {
    color: var(--dark-gray);
}

/* ============================================
   CTA SECTION
   ============================================ */
.cta-section {
    background:
        linear-gradient(rgba(0,0,0,0.22), rgba(0,0,0,0.22)),
        linear-gradient(
            to right,
            #141f4d 0%, #141f4d 25%,
            #7b3a9e 25%, #7b3a9e 50%,
            #b8539e 50%, #b8539e 75%,
            #1577b8 75%, #1577b8 100%
        );
    color: #fff;
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-lg);
}

.cta-section h2 {
    color: #fff;
    margin-bottom: var(--spacing-lg);
    text-transform: uppercase;
    font-weight: 900;
    letter-spacing: -0.01em;
}

.cta-section p {
    margin-bottom: var(--spacing-xl);
    font-size: var(--font-size-lg);
}

/* ============================================
   FORMS
   ============================================ */
.form-container {
    max-width: 500px;
    margin: var(--spacing-2xl) auto;
    padding: var(--spacing-xl);
    border: 1px solid var(--medium-gray);
    border-radius: 8px;
    background-color: var(--bg);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--primary);
}

.form-group input {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--medium-gray);
    border-radius: 4px;
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    transition: var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(233, 69, 96, 0.1);
}

.error-message {
    color: var(--danger);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-sm);
}

.success-message {
    color: var(--success);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-sm);
}

.form-footer {
    text-align: center;
    margin-top: var(--spacing-lg);
}

.form-footer p {
    margin-bottom: var(--spacing-md);
}

.form-footer a {
    color: var(--accent);
    font-weight: 600;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background-color: var(--primary);
    color: var(--bg);
    padding: var(--spacing-2xl) var(--spacing-lg);
    margin-top: var(--spacing-2xl);
    border-top: 5px solid transparent;
    border-image: linear-gradient(
        to right,
        #1577b8 0%, #1577b8 25%,
        #b8539e 25%, #b8539e 50%,
        #7b3a9e 50%, #7b3a9e 75%,
        #141f4d 75%, #141f4d 100%
    ) 1;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h3,
.footer-section h4 {
    color: var(--bg);
    margin-bottom: var(--spacing-md);
}

.footer-tagline {
    color: #ccc;
    font-size: var(--font-size-sm);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    color: #ccc;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--accent);
}

.social-links {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.social-link {
    color: #ccc;
    font-weight: 500;
}

.footer-divider {
    height: 1px;
    background-color: #555;
    margin-bottom: var(--spacing-lg);
}

.footer-bottom {
    text-align: center;
    color: #999;
    font-size: var(--font-size-sm);
}

/* ============================================
   UTILITIES
   ============================================ */
.text-center {
    text-align: center;
}

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

.text-muted {
    color: var(--dark-gray);
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }

.hidden {
    display: none;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

/* Tablet & Small Desktop */
@media (max-width: 768px) {
    .navbar-container {
        padding: var(--spacing-md);
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--bg);
        flex-direction: column;
        gap: 0;
        display: none;
        border-top: 1px solid var(--medium-gray);
        padding: var(--spacing-lg);
        animation: slideDown 0.3s ease;
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-list {
        flex-direction: column;
        gap: var(--spacing-md);
        width: 100%;
        margin-left: 0;
    }

    .nav-auth {
        width: 100%;
        flex-direction: column;
        margin-top: var(--spacing-md);
        padding-top: var(--spacing-md);
        border-top: 1px solid var(--medium-gray);
    }

    .hamburger {
        display: flex;
    }

    .hero h1 {
        font-size: var(--font-size-2xl);
    }

    .products-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .grid-3,
    .grid-4 {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }

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

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

/* Mobile */
@media (max-width: 480px) {
    body {
        font-size: 14px;
    }

    h1 {
        font-size: 28px;
    }

    h2 {
        font-size: 22px;
    }

    .nav-menu {
        gap: 0;
        padding: var(--spacing-md);
    }

    .hero {
        min-height: 400px;
        padding: var(--spacing-lg);
    }

    .hero-buttons {
        flex-direction: column;
    }

    .hero-buttons .btn {
        width: 100%;
    }

    .form-container {
        margin: var(--spacing-lg);
        padding: var(--spacing-lg);
    }

    .filter-buttons {
        justify-content: center;
        gap: 8px;
    }

    .filter-btn {
        padding: 8px 12px;
        font-size: 12px;
    }

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

    section {
        padding: var(--spacing-lg) 0;
    }
}