/* ============================================================
   DARK MODE THEME - Dark Blue & Red Accents
   ============================================================ */

/* --- CSS Custom Properties --- */
:root {
    --bg-primary: #0a0f1a;
    --bg-secondary: #0d1525;
    --bg-sidebar: #0f1a2e;
    --bg-card: #121d30;
    --bg-card-hover: #17263d;
    --accent-primary: #8b1a1a;
    --accent-secondary: #6b1414;
    --accent-glow: rgba(139, 26, 26, 0.2);
    --accent-hover: #a82020;
    --text-primary: #ffffff;
    --text-secondary: #d0d0d0;
    --text-heading: #ffffff;
    --link-color: #ffffff;
    --link-hover: #ffffff;
    --border-color: #1e2a40;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    --transition: all 0.3s ease;
    --sidebar-width: 260px;
    --sidebar-collapsed: 70px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
}

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

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

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

ul {
    list-style: none;
}

/* ============================================================
   SIDEBAR
   ============================================================ */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    overflow-y: auto;
    overflow-x: hidden;
}

/* Sidebar Brand / Logo */
.sidebar-brand {
    padding: 1.8rem 1.5rem;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-brand h1 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-heading);
    letter-spacing: 1px;
}

.sidebar-brand .brand-accent {
    color: var(--accent-primary);
}

.sidebar-brand .brand-sub {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 400;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-top: 0.25rem;
}

/* Sidebar Navigation */
.sidebar-nav {
    flex: 1;
    padding: 1.5rem 0;
}

.sidebar-nav .nav-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-secondary);
    padding: 0.75rem 1.5rem 0.5rem;
    font-weight: 600;
}

.sidebar-nav ul li a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 1.5rem;
    color: var(--link-color);
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
    position: relative;
    border-left: 3px solid transparent;
}

.sidebar-nav ul li a:hover {
    background: var(--accent-glow);
    color: var(--link-hover);
    border-left-color: var(--accent-primary);
}

.sidebar-nav ul li a.active {
    background: var(--accent-glow);
    color: var(--accent-primary);
    border-left-color: var(--accent-primary);
}

.sidebar-nav ul li a .nav-icon {
    width: 22px;
    text-align: center;
    font-size: 1.1rem;
    flex-shrink: 0;
}

/* Sidebar Footer */
.sidebar-footer {
    padding: 1.2rem 1.5rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-align: center;
}

/* ============================================================
   MAIN CONTENT
   ============================================================ */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header / Top Bar */
.top-bar {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 500;
}

.top-bar .page-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-heading);
}

.top-bar .top-bar-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Mobile Hamburger */
.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    color: var(--text-heading);
    font-size: 1.5rem;
    line-height: 1;
}

/* ============================================================
   LOGO BANNER
   ============================================================ */
.logo-banner {
    width: 80%;
    max-width: 960px;
    margin: 0 auto;
    display: block;
}

.logo-banner svg,
.logo-banner img {
    width: 100%;
    height: auto;
    display: block;
}

/* Sidebar logo */
.sidebar-logo-icon {
    display: block;
    width: 100%;
    max-width: 200px;
    height: auto;
    margin: 0 auto 0.8rem;
    border-radius: 8px;
    overflow: hidden;
    object-fit: contain;
}

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
    padding: 4rem 2rem;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, #0d1525 50%, #120b1a 100%);
    border-bottom: 1px solid var(--border-color);
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-heading);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero h1 .highlight {
    color: var(--accent-primary);
}

.hero p {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 650px;
    line-height: 1.8;
}

.hero .cta-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.8rem;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(139, 26, 26, 0.35);
}

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

.btn-secondary:hover {
    background: var(--accent-primary);
    color: #ffffff;
    transform: translateY(-2px);
}

/* ============================================================
   CONTENT SECTIONS
   ============================================================ */
.content-section {
    padding: 3rem 2rem;
    flex: 1;
}

.content-section .container {
    max-width: 900px;
    margin: 0 auto;
}

.content-section h2 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-heading);
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.75rem;
}

.content-section h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--accent-primary);
    border-radius: 2px;
}

.content-section h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-heading);
    margin-bottom: 0.75rem;
}

.content-section p {
    margin-bottom: 1.25rem;
    color: var(--text-primary);
    line-height: 1.8;
}

/* --- Card Grid --- */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 2rem;
    transition: var(--transition);
}

.card:hover {
    background: var(--bg-card-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow);
    border-color: var(--accent-primary);
}

.card .card-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    display: block;
}

.card h3 {
    font-size: 1.15rem;
    margin-bottom: 0.75rem;
}

.card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* ============================================================
   ABOUT PAGE SPECIFIC
   ============================================================ */
.about-intro {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.about-intro .about-text {
    flex: 1;
    min-width: 280px;
}

.about-intro .about-image {
    flex: 0 0 200px;
    height: 200px;
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: var(--accent-primary);
}

.skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1rem;
}

.skills-list .skill-tag {
    background: var(--accent-glow);
    color: var(--accent-primary);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    border: 1px solid rgba(139, 26, 26, 0.3);
}

/* ============================================================
   CONTACT PAGE SPECIFIC
   ============================================================ */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-top: 1.5rem;
}

.contact-info-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 2rem;
}

.contact-info-card .contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.contact-info-card .contact-item:last-child {
    margin-bottom: 0;
}

.contact-info-card .contact-icon {
    width: 40px;
    height: 40px;
    background: var(--accent-glow);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
    color: var(--accent-primary);
}

.contact-info-card .contact-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

.contact-info-card .contact-value {
    color: var(--text-heading);
    font-weight: 500;
}

.contact-form-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 2rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-heading);
    margin-bottom: 0.4rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* ============================================================
   FOOTER
   ============================================================ */
.page-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 1.5rem 2rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.page-footer a {
    color: #ffffff;
}

.page-footer a:hover {
    color: #ffffff;
    text-decoration: underline;
}

/* ============================================================
   OVERLAY (for mobile sidebar)
   ============================================================ */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    z-index: 999;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.sidebar-overlay.show {
    opacity: 1;
}

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

/* Tablets & Small Screens */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 220px;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
}

/* Mobile */
@media (max-width: 768px) {
    body {
        flex-direction: column;
    }

    /* Hamburger visible */
    .hamburger {
        display: block;
    }

    /* Sidebar slides off-screen */
    .sidebar {
        transform: translateX(-100%);
        width: 280px;
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-overlay {
        display: block;
        pointer-events: none;
    }

    .sidebar-overlay.show {
        pointer-events: auto;
    }

    /* Main content full width */
    .main-content {
        margin-left: 0;
    }

    /* Top bar adjustments */
    .top-bar {
        padding: 0.75rem 1rem;
    }

    .top-bar .page-title {
        font-size: 1rem;
    }

    /* Hero */
    .hero {
        padding: 2.5rem 1rem;
    }

    .hero h1 {
        font-size: 1.6rem;
    }

    .hero p {
        font-size: 1rem;
    }

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

    .btn {
        width: 100%;
        justify-content: center;
    }

    /* Sections */
    .content-section {
        padding: 2rem 1rem;
    }

    .content-section h2 {
        font-size: 1.4rem;
    }

    /* Contact Grid */
    .contact-grid {
        grid-template-columns: 1fr;
    }

    /* About */
    .about-intro .about-image {
        flex-basis: 150px;
        height: 150px;
    }

    /* Cards */
    .card-grid {
        grid-template-columns: 1fr;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.3rem;
    }

    .sidebar {
        width: 100%;
    }

    .card {
        padding: 1.25rem;
    }

    .contact-form-card,
    .contact-info-card {
        padding: 1.25rem;
    }
}