/* ============================================
   FLEX COMPUTERS - MODERN DESIGN SYSTEM
   ============================================ */

/* CSS Variables - Design Tokens */
:root {
    /* Color Palette */
    --primary-blue: #1D4ED8;
    --primary-dark: #111827;
    --primary-white: #FFFFFF;
    
    --accent-green: #A7F3D0;
    --accent-light-blue: #BFDBFE;
    --accent-gray: #F3F4F6;
    --accent-dark-gray: #E5E7EB;
    --text-gray: #6B7280;
    --text-light-gray: #9CA3AF;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #1D4ED8 0%, #3B82F6 100%);
    --gradient-accent: linear-gradient(135deg, #A7F3D0 0%, #6EE7B7 100%);
    --gradient-hover: linear-gradient(135deg, #1E40AF 0%, #1D4ED8 100%);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Typography */
    --font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 600;
    --font-weight-extra-bold: 700;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 24px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
    --shadow-glass: 0 8px 32px rgba(31, 38, 135, 0.15);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-Index Scale */
    --z-dropdown: 10;
    --z-sticky: 100;
    --z-modal: 1000;
}

/* ============================================
   GLOBAL STYLES
   ============================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--accent-gray);
    color: var(--primary-dark);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */

header {
    background: linear-gradient(135deg, var(--primary-dark) 0%, #1a2332 100%);
    color: var(--primary-white);
    padding: var(--spacing-md) var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(10px);
}

.logo-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    cursor: pointer;
    transition: transform var(--transition-base);
}

.logo-container:hover {
    transform: scale(1.05);
}

.logo {
    height: 40px;
    width: 40px;
    background-color: var(--primary-white);
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
}

.logo:hover {
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
}

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

nav a {
    color: var(--primary-white);
    text-decoration: none;
    font-weight: var(--font-weight-bold);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-accent);
    transition: width var(--transition-base);
}

nav a:hover {
    color: var(--accent-green);
}

nav a:hover::after {
    width: 100%;
}

/* ============================================
   DROPDOWN MENU
   ============================================ */

.contact-dropdown {
    position: relative;
    display: inline-block;
}

.dropbtn {
    background: var(--gradient-primary);
    color: var(--primary-white);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: var(--font-weight-bold);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
}

.dropbtn:hover {
    background: var(--gradient-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.dropbtn:active {
    transform: translateY(0);
}

.dropdown-content {
    display: none;
    position: absolute;
    right: 0;
    background-color: var(--primary-white);
    min-width: 200px;
    box-shadow: var(--shadow-xl);
    z-index: var(--z-dropdown);
    border-radius: var(--radius-md);
    overflow: hidden;
    animation: slideDown var(--transition-fast) ease-out;
}

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

.dropdown-content a {
    color: var(--primary-dark);
    padding: var(--spacing-md) var(--spacing-lg);
    text-decoration: none;
    display: block;
    transition: all var(--transition-base);
    border-left: 3px solid transparent;
}

.dropdown-content a:hover {
    background: var(--accent-light-blue);
    border-left-color: var(--primary-blue);
    padding-left: calc(var(--spacing-lg) + 4px);
}

.contact-dropdown:hover .dropdown-content {
    display: block;
}

/* ============================================
   MAIN CONTENT
   ============================================ */

main {
    flex: 1;
}

.section {
    display: none;
    animation: fadeIn var(--transition-slow) ease-in;
}

.section.active {
    display: block;
}

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

.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

/* ============================================
   HERO SECTION
   ============================================ */

#home {
    background: linear-gradient(135deg, var(--accent-light-blue) 0%, var(--accent-gray) 50%, var(--primary-white) 100%);
    padding: var(--spacing-2xl) var(--spacing-xl);
    position: relative;
    overflow: hidden;
}

#home::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(167, 243, 208, 0.2) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 8s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(30px);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

#home h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: var(--font-weight-extra-bold);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-lg);
    line-height: 1.2;
}

#home p {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--text-gray);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

/* ============================================
   BUTTONS
   ============================================ */

.btn-primary {
    background: var(--gradient-primary);
    color: var(--primary-white);
    padding: var(--spacing-sm) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: var(--font-weight-bold);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    display: inline-block;
    text-align: center;
}

.btn-primary:hover {
    background: var(--gradient-hover);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:active {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* ============================================
   SECTIONS & TYPOGRAPHY
   ============================================ */

#laptops,
#accessories {
    padding: var(--spacing-2xl) var(--spacing-xl);
}

#laptops h2,
#accessories h2 {
    font-size: 2rem;
    font-weight: var(--font-weight-extra-bold);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xl);
}

/* ============================================
   FILTER BAR
   ============================================ */

.filter-bar {
    background-color: var(--primary-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-xl);
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
    flex-wrap: wrap;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--accent-dark-gray);
    transition: all var(--transition-base);
}

.filter-bar:hover {
    box-shadow: var(--shadow-lg);
}

.filter-bar select,
.filter-bar input {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--accent-light-blue);
    border-radius: var(--radius-sm);
    outline: none;
    font-family: var(--font-family);
    cursor: pointer;
    transition: all var(--transition-base);
    background-color: var(--primary-white);
}

.filter-bar select:hover,
.filter-bar input:hover {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.1);
}

.filter-bar select:focus,
.filter-bar input:focus {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.2);
}

/* ============================================
   PRODUCT GRID
   ============================================ */

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    animation: fadeIn var(--transition-slow) ease-in;
}

/* ============================================
   PRODUCT CARDS
   ============================================ */

.card {
    background-color: var(--primary-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    border: 1px solid var(--accent-dark-gray);
    cursor: pointer;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-blue);
}

.card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
    background: linear-gradient(135deg, var(--accent-light-blue) 0%, var(--accent-gray) 100%);
    position: relative;
    transition: all var(--transition-base);
}

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

.card-content {
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    flex: 1;
}

.card-title {
    font-size: 1.1rem;
    font-weight: var(--font-weight-bold);
    color: var(--primary-dark);
    line-height: 1.4;
}

.card-code {
    font-size: 0.85rem;
    color: var(--text-light-gray);
    font-family: 'Courier New', monospace;
}

.card-price {
    font-size: 1.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: var(--font-weight-extra-bold);
    margin: var(--spacing-sm) 0;
}

.card-delivery {
    background: var(--gradient-accent);
    color: var(--primary-dark);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: var(--font-weight-bold);
    display: inline-block;
    align-self: flex-start;
    margin-top: auto;
    transition: all var(--transition-base);
}

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

/* ============================================
   FOOTER
   ============================================ */

footer {
    background: linear-gradient(135deg, var(--primary-dark) 0%, #1a2332 100%);
    color: var(--primary-white);
    text-align: center;
    padding: var(--spacing-xl);
    margin-top: auto;
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.1);
    font-size: 0.95rem;
}

footer p {
    opacity: 0.9;
    transition: opacity var(--transition-base);
}

footer:hover p {
    opacity: 1;
}

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

@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
    }

    nav {
        width: 100%;
        justify-content: space-around;
        gap: var(--spacing-sm);
    }

    nav a {
        font-size: 0.9rem;
    }

    .section-container {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: var(--spacing-lg);
    }

    #home h1 {
        font-size: 2rem;
    }

    #home p {
        font-size: 1rem;
    }

    .filter-bar {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-bar select,
    .filter-bar input {
        width: 100%;
    }
}

@media (max-width: 480px) {
    header {
        padding: var(--spacing-sm);
    }

    nav {
        gap: var(--spacing-sm);
        flex-wrap: wrap;
    }

    nav a {
        font-size: 0.8rem;
    }

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

    #home {
        padding: var(--spacing-xl) var(--spacing-md);
    }

    #home h1 {
        font-size: 1.5rem;
    }

    .btn-primary {
        width: 100%;
    }
}

/* ============================================
   ACCESSIBILITY & PREFERS-REDUCED-MOTION
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ============================================
   DARK MODE SUPPORT
   ============================================ */

@media (prefers-color-scheme: dark) {
    :root {
        --accent-gray: #1a1f2e;
        --primary-white: #f5f5f7;
        --text-gray: #b0b0b5;
        --accent-dark-gray: #383d47;
    }

    body {
        background-color: var(--primary-dark);
        color: var(--primary-white);
    }

    .filter-bar {
        background-color: #1f2937;
        border-color: var(--accent-dark-gray);
    }

    .filter-bar select,
    .filter-bar input {
        background-color: #1f2937;
        color: var(--primary-white);
    }

    .card {
        background-color: #1f2937;
        border-color: var(--accent-dark-gray);
    }

    .card-title {
        color: var(--primary-white);
    }

    .dropdown-content {
        background-color: #1f2937;
        color: var(--primary-white);
    }

    .dropdown-content a {
        color: var(--primary-white);
    }

    .dropdown-content a:hover {
        background-color: rgba(167, 243, 208, 0.1);
    }
}