/**
 * TechRounder Guides - Main Stylesheet
 * Modern, mobile-first responsive design
 */

/* ========================================
   CSS Custom Properties (Design Tokens)
   ======================================== */
:root {
    /* Colors */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #22d3ee;
    --accent: #f472b6;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;

    /* Dark Theme */
    --dark: #0f172a;
    --dark-light: #1e293b;
    --dark-lighter: #334155;
    --gray: #64748b;
    --gray-light: #94a3b8;
    --light: #f1f5f9;
    --white: #ffffff;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #d946ef 100%);
    --gradient-secondary: linear-gradient(135deg, #0ea5e9 0%, #22d3ee 100%);
    --gradient-success: linear-gradient(135deg, #10b981 0%, #34d399 100%);
    --gradient-bg: radial-gradient(ellipse at 20% 20%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(34, 211, 238, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(244, 114, 182, 0.08) 0%, transparent 50%);

    /* Typography */
    --font-primary: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 50px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.3);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Container */
    --container-max: 1200px;
    --container-padding: 1rem;
}

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

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

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.7;
    color: var(--light);
    background: var(--dark);
    overflow-x: hidden;
    min-height: 100vh;
}

/* Animated Background */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: var(--gradient-bg);
    animation: bgMove 20s ease-in-out infinite;
}

@keyframes bgMove {

    0%,
    100% {
        transform: translate(-5%, -5%);
    }

    50% {
        transform: translate(5%, 5%);
    }
}

/* Selection */
::selection {
    background: rgba(99, 102, 241, 0.4);
    color: white;
}

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

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

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

/* Focus styles */
:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* ========================================
   Typography
   ======================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--white);
}

h1 {
    font-size: clamp(2rem, 5vw, 3rem);
}

h2 {
    font-size: clamp(1.5rem, 4vw, 2.25rem);
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
}

h4 {
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
}

p {
    color: var(--gray-light);
    margin-bottom: var(--space-md);
}

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

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

.main-wrapper {
    min-height: calc(100vh - 200px);
    padding-top: 80px;
}

/* ========================================
   Header
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-decoration: none;
}

.logo-img {
    height: 40px;
    width: auto;
    filter: brightness(0) invert(1);
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--white);
    display: none;
}

@media (min-width: 768px) {
    .logo-text {
        display: block;
    }
}

.nav {
    display: none;
    gap: var(--space-lg);
}

@media (min-width: 768px) {
    .nav {
        display: flex;
    }
}

.nav-link {
    color: var(--gray-light);
    font-weight: 500;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--white);
    background: rgba(99, 102, 241, 0.1);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

@media (min-width: 768px) {
    .mobile-menu-btn {
        display: none;
    }
}

.mobile-menu-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--light);
    border-radius: 2px;
    transition: all var(--transition-normal);
}

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

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

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

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    top: 65px;
    left: 0;
    right: 0;
    background: rgba(15, 23, 42, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: var(--space-lg);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 999;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.mobile-nav {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.mobile-nav-link {
    display: block;
    padding: var(--space-md);
    color: var(--light);
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.mobile-nav-link:hover {
    background: rgba(99, 102, 241, 0.1);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: var(--dark-light);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: var(--space-3xl) 0 var(--space-xl);
    margin-top: var(--space-3xl);
}

.footer-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

@media (min-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr 2fr;
    }
}

.footer-brand {
    text-align: center;
}

@media (min-width: 768px) {
    .footer-brand {
        text-align: left;
    }
}

.footer-logo {
    height: 40px;
    margin: 0 auto var(--space-md);
    filter: brightness(0) invert(1);
}

@media (min-width: 768px) {
    .footer-logo {
        margin: 0 0 var(--space-md);
    }
}

.footer-tagline {
    color: var(--gray);
    font-size: 0.9rem;
}

.footer-links {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
}

.footer-column h4 {
    font-size: 1rem;
    margin-bottom: var(--space-md);
    color: var(--white);
}

.footer-column a {
    display: block;
    color: var(--gray);
    font-size: 0.9rem;
    padding: var(--space-xs) 0;
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: var(--white);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: var(--space-xl);
    text-align: center;
}

.footer-bottom p {
    color: var(--gray);
    font-size: 0.85rem;
    margin: 0;
}

.footer-note {
    margin-top: var(--space-sm) !important;
    font-size: 0.8rem !important;
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
}

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

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

.btn-secondary {
    background: var(--dark-light);
    color: var(--light);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

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

.btn-sm {
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.9rem;
}

/* ========================================
   Cards
   ======================================== */
.card {
    background: var(--dark-light);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: var(--space-lg);
    transition: all var(--transition-normal);
}

.card:hover {
    border-color: rgba(99, 102, 241, 0.3);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.article-card {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.article-card-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.article-emoji {
    font-size: 2rem;
    flex-shrink: 0;
}

.article-card-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--white);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Title link - keeps white color */
.title-link {
    color: var(--white);
    text-decoration: none;
}

.title-link:hover {
    color: var(--white);
}

.article-card-description {
    color: var(--gray);
    font-size: 0.9rem;
    margin-bottom: var(--space-lg);
    flex-grow: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--space-md);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.article-card-category {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    color: var(--primary-light);
}

.article-card-link {
    color: var(--primary);
    font-size: 0.9rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
}

.article-card-link:hover {
    gap: var(--space-sm);
}

/* ========================================
   Search
   ======================================== */
.search-box {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
}

.search-input {
    width: 100%;
    padding: var(--space-lg) var(--space-xl);
    padding-right: 60px;
    font-family: var(--font-primary);
    font-size: 1rem;
    color: var(--white);
    background: var(--dark-light);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    transition: all var(--transition-normal);
}

.search-input::placeholder {
    color: var(--gray);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.search-btn {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 44px;
    height: 44px;
    background: var(--gradient-primary);
    border: none;
    border-radius: 50%;
    color: var(--white);
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.search-btn:hover {
    transform: translateY(-50%) scale(1.05);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    text-align: center;
    padding: var(--space-3xl) var(--container-padding);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.3);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    color: var(--primary-light);
    margin-bottom: var(--space-lg);
}

.hero-title {
    font-size: clamp(2rem, 6vw, 3.5rem);
    font-weight: 700;
    margin-bottom: var(--space-lg);
    line-height: 1.2;
}

.hero-description {
    font-size: 1.15rem;
    color: var(--gray-light);
    max-width: 600px;
    margin: 0 auto var(--space-2xl);
}

/* ========================================
   Sections
   ======================================== */
.section {
    padding: var(--space-3xl) var(--container-padding);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
    gap: var(--space-md);
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.section-link {
    color: var(--primary);
    font-size: 0.9rem;
    font-weight: 500;
}

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

.grid-2 {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
}

/* ========================================
   Category Cards
   ======================================== */
.category-card {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    background: var(--dark-light);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all var(--transition-normal);
    text-decoration: none;
}

.category-card:hover {
    border-color: rgba(99, 102, 241, 0.3);
    transform: translateY(-2px);
}

.category-icon {
    width: 48px;
    height: 48px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.category-info {
    flex: 1;
}

.category-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: var(--space-xs);
}

.category-count {
    font-size: 0.85rem;
    color: var(--gray);
}

/* ========================================
   Pagination
   ======================================== */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    margin-top: var(--space-2xl);
    flex-wrap: wrap;
}

.pagination-btn {
    padding: var(--space-sm) var(--space-lg);
    background: var(--dark-light);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    color: var(--light);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.pagination-btn:hover {
    background: var(--dark-lighter);
    border-color: var(--primary);
}

.pagination-numbers {
    display: flex;
    gap: var(--space-xs);
}

.pagination-num {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--dark-light);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    color: var(--gray);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.pagination-num:hover,
.pagination-num.active {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--white);
}

.pagination-dots {
    width: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray);
}

/* ========================================
   Back to Top
   ======================================== */
.back-to-top {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border: none;
    border-radius: 50%;
    color: var(--white);
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    z-index: 100;
    box-shadow: var(--shadow-lg);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: scale(1.1);
}

/* ========================================
   Toast Notification
   ======================================== */
.toast {
    position: fixed;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--dark-light);
    border: 1px solid rgba(99, 102, 241, 0.3);
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    box-shadow: var(--shadow-lg);
    z-index: 10000;
    opacity: 0;
    transition: all var(--transition-normal);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast-icon {
    font-size: 1.2rem;
}

.toast-message {
    color: var(--light);
    font-size: 0.95rem;
}

/* ========================================
   Empty State
   ======================================== */
.empty-state {
    text-align: center;
    padding: var(--space-3xl);
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: var(--space-lg);
    opacity: 0.5;
}

.empty-state-title {
    font-size: 1.5rem;
    margin-bottom: var(--space-md);
}

.empty-state-text {
    color: var(--gray);
    margin-bottom: var(--space-xl);
}

/* ========================================
   Scrollbar
   ======================================== */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--dark);
}

::-webkit-scrollbar-thumb {
    background: var(--dark-lighter);
    border-radius: 5px;
}

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

/* ========================================
   Loading State
   ======================================== */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3xl);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(99, 102, 241, 0.1);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}