/* ==================== Variables ==================== */
:root {
    --primary-color: #0066cc;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --info-color: #17a2b8;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --border-color: #dee2e6;
    
    --transition: all 0.3s ease;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 20px rgba(0,0,0,0.15);
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --primary-color: #4da3ff;
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --text-primary: #f8f9fa;
    --text-secondary: #adb5bd;
    --border-color: #495057;
}

/* ==================== Global Styles ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: var(--transition);
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
}

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

a:hover {
    color: #0052a3;
}

/* ==================== Header & Navigation ==================== */
header {
    background-color: var(--bg-primary) !important;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.navbar {
    padding: 1rem 0;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
}

.nav-link {
    font-weight: 500;
    color: var(--text-primary) !important;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary-color) !important;
}

.top-bar {
    background-color: var(--bg-secondary) !important;
    font-size: 0.875rem;
}

.social-links a {
    color: var(--text-secondary);
    transition: var(--transition);
}

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

/* Dark Mode Toggle */
#darkModeToggle {
    border: none;
    background: transparent;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--text-primary);
}

#darkModeToggle:hover {
    color: var(--primary-color);
}

/* ==================== Hero Section ==================== */
.hero-section {
    background: linear-gradient(135deg, #0066cc 0%, #004c99 100%);
    min-height: 60vh;
    display: flex;
    align-items: center;
}

.min-vh-50 {
    min-height: 50vh;
}

.bg-gradient-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, #004c99 100%);
}

.hero-illustration {
    text-align: center;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

/* ==================== Features Section ==================== */
.feature-card {
    transition: var(--transition);
    border-radius: 1rem;
    background-color: var(--bg-primary);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg) !important;
}

.hover-lift {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hover-lift:hover {
    transform: translateY(-5px);
}

.feature-icon {
    display: inline-block;
    width: 70px;
    height: 70px;
    line-height: 70px;
    text-align: center;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.1) 0%, rgba(0, 102, 204, 0.2) 100%);
}

/* ==================== Tech Stack Section ==================== */
.tech-badges .badge {
    font-weight: 500;
    border-radius: 50px;
    transition: var(--transition);
}

.tech-badges .badge:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow);
}

/* ==================== CTA Section ==================== */
.cta-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, #004c99 100%);
}

/* ==================== Cards ==================== */
.card {
    border-radius: 1rem;
    transition: var(--transition);
    background-color: var(--bg-primary);
    border-color: var(--border-color);
}

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

/* ==================== Buttons ==================== */
.btn {
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    border-radius: 0.5rem;
    transition: var(--transition);
}

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

.btn-primary:hover {
    background-color: #0052a3;
    border-color: #0052a3;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

/* ==================== Footer ==================== */
footer {
    background-color: var(--dark-color) !important;
    color: var(--light-color) !important;
}

footer h5, footer h6 {
    color: var(--light-color);
}

footer a {
    color: var(--light-color);
    opacity: 0.8;
}

footer a:hover {
    opacity: 1;
    color: var(--light-color);
}

/* ==================== Page Content ==================== */
.page-header {
    background-color: var(--bg-secondary);
}

.content {
    font-size: 1.1rem;
    line-height: 1.8;
}

.content h1, .content h2, .content h3 {
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.content p {
    margin-bottom: 1.5rem;
}

.content ul, .content ol {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

.content img {
    max-width: 100%;
    height: auto;
    border-radius: 0.5rem;
    margin: 2rem 0;
}

/* ==================== Animations ==================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in {
    animation: fadeIn 0.8s ease-out;
}

/* ==================== Dark Mode ==================== */
[data-theme="dark"] body {
    background-color: #1a1a1a;
    color: #f8f9fa;
}

[data-theme="dark"] .navbar,
[data-theme="dark"] header,
[data-theme="dark"] .navbar-light {
    background-color: #1a1a1a !important;
    border-bottom-color: #333;
}

[data-theme="dark"] .navbar-light .nav-link { color: #adb5bd !important; }
[data-theme="dark"] .navbar-light .nav-link:hover { color: #fff !important; }
[data-theme="dark"] .navbar-light .navbar-toggler-icon { filter: invert(1); }

[data-theme="dark"] .bg-light {
    background-color: #222 !important;
}

[data-theme="dark"] .bg-white {
    background-color: #1a1a1a !important;
}

[data-theme="dark"] .card,
[data-theme="dark"] .feature-card,
[data-theme="dark"] .contact-info-card {
    background-color: #2d2d2d;
    border-color: #333;
}

[data-theme="dark"] .card-body { color: #e0e0e0; }
[data-theme="dark"] .card-title { color: #fff; }
[data-theme="dark"] .card-text { color: #adb5bd; }

[data-theme="dark"] .page-header {
    background-color: #222;
}

[data-theme="dark"] .top-bar {
    background-color: #222 !important;
    border-bottom-color: #333;
}

[data-theme="dark"] .text-dark { color: #f8f9fa !important; }
[data-theme="dark"] .text-muted { color: #adb5bd !important; }

[data-theme="dark"] .shadow-sm { box-shadow: 0 2px 4px rgba(0,0,0,0.3) !important; }
[data-theme="dark"] .shadow { box-shadow: 0 4px 6px rgba(0,0,0,0.4) !important; }

[data-theme="dark"] .border-bottom { border-color: #333 !important; }

[data-theme="dark"] .btn-outline-primary { color: #4da3ff; border-color: #4da3ff; }
[data-theme="dark"] .btn-outline-primary:hover { background: #4da3ff; color: #fff; }

[data-theme="dark"] .btn-link { color: #4da3ff; }

[data-theme="dark"] .form-control,
[data-theme="dark"] .form-select {
    background-color: #2d2d2d;
    border-color: #444;
    color: #f8f9fa;
}

[data-theme="dark"] .form-control:focus,
[data-theme="dark"] .form-select:focus {
    background-color: #333;
    color: #fff;
}

[data-theme="dark"] hr { border-color: #333 !important; }

[data-theme="dark"] address,
[data-theme="dark"] .contact-info p { color: #adb5bd; }

[data-theme="dark"] .badge.bg-light { background-color: #333 !important; color: #adb5bd !important; }
[data-theme="dark"] .badge.bg-primary-subtle { background-color: rgba(77,163,255,0.15) !important; }

/* ==================== Responsive Design ==================== */
@media (max-width: 768px) {
    .hero-section {
        min-height: 50vh;
        padding: 3rem 0;
    }
    
    .display-4 {
        font-size: 2rem;
    }
    
    .display-5 {
        font-size: 1.75rem;
    }
    
    .display-6 {
        font-size: 1.5rem;
    }
}

/* ==================== Utilities ==================== */
.shadow-sm {
    box-shadow: var(--shadow-sm) !important;
}

.shadow {
    box-shadow: var(--shadow) !important;
}

.shadow-lg {
    box-shadow: var(--shadow-lg) !important;
}

.text-muted {
    color: var(--text-secondary) !important;
}

/* ==================== Loading Animations ==================== */
.loading {
    opacity: 0;
    animation: fadeIn 0.5s ease-out forwards;
}

/* ==================== Smooth Scrolling ==================== */
html {
    scroll-behavior: smooth;
}