/* =============================================
       CSS VARIABLES (Custom Properties)
       ============================================= */
    :root {
        /* Color Palette */
        --primary-color: #6366f1;
        --secondary-color: #8b5cf6;
        --accent-color: #06b6d4;
        --success-color: #10b981;
        --warning-color: #f59e0b;
        --dark-color: #1f2937;
        --light-color: #f8fafc;
        
        /* Gradients */
        --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
        --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
        
        /* Shadows */
        --shadow-soft: 0 10px 25px rgba(0, 0, 0, 0.1);
        --shadow-hover: 0 15px 35px rgba(0, 0, 0, 0.15);
    }

    /* =============================================
       BASE STYLES & RESETS
       ============================================= */
    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }

    html {
        scroll-behavior: smooth;
    }

    body {
        font-family: 'Inter', sans-serif;
        line-height: 1.6;
        color: var(--dark-color);
        overflow-x: hidden;
    }

    /* =============================================
       CUSTOM SCROLLBAR
       ============================================= */
    ::-webkit-scrollbar {
        width: 8px;
    }

    ::-webkit-scrollbar-track {
        background: #f1f1f1;
    }

    ::-webkit-scrollbar-thumb {
        background: var(--primary-color);
        border-radius: 4px;
    }

    /* =============================================
       NAVIGATION
       ============================================= */
    .navbar {
        backdrop-filter: blur(20px);
        background: rgba(255, 255, 255, 0.95) !important;
        box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
        transition: all 0.3s ease;
    }

    .navbar-brand {
        font-weight: 700;
        font-size: 1.5rem;
        background: var(--gradient-primary);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }

    .navbar-nav .nav-link {
        font-weight: 500;
        margin: 0 0.5rem;
        padding: 0.5rem 1rem !important;
        border-radius: 25px;
        transition: all 0.3s ease;
        position: relative;
    }

    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
        color: var(--primary-color) !important;
        background: rgba(99, 102, 241, 0.1);
        transform: translateY(-2px);
    }

    /* Availability Badge */
    .availability-badge {
        background: linear-gradient(135deg, #10b981, #059669);
        color: white;
        padding: 0.5rem 1rem;
        border-radius: 25px;
        font-size: 0.875rem;
        font-weight: 500;
        display: flex;
        align-items: center;
        gap: 0.5rem;
    }

    .availability-dot {
        width: 8px;
        height: 8px;
        background: #34d399;
        border-radius: 50%;
        animation: pulse 2s infinite;
    }

    /* =============================================
       HERO SECTION
       ============================================= */
    .hero-section {
        min-height: 100vh;
        display: flex;
        align-items: center;
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        position: relative;
        overflow: hidden;
    }

    .hero-section::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><defs><radialGradient id="a"><stop offset="0%" stop-color="%23ffffff" stop-opacity="0.1"/><stop offset="100%" stop-color="%23ffffff" stop-opacity="0"/></radialGradient></defs><circle cx="200" cy="200" r="100" fill="url(%23a)"/><circle cx="800" cy="300" r="150" fill="url(%23a)"/><circle cx="400" cy="700" r="120" fill="url(%23a)"/></svg>');
        opacity: 0.5;
    }

    .hero-content {
        position: relative;
        z-index: 2;
    }

    .hero-title {
        font-size: 4rem;
        font-weight: 700;
        color: white;
        margin-bottom: 1.5rem;
        animation: fadeInUp 1s ease-out;
    }

    .hero-subtitle {
        font-size: 1.5rem;
        color: rgba(255, 255, 255, 0.9);
        margin-bottom: 2rem;
        animation: fadeInUp 1s ease-out 0.2s both;
    }

    .hero-tags {
        display: flex;
        flex-wrap: wrap;
        gap: 1rem;
        margin-bottom: 3rem;
        animation: fadeInUp 1s ease-out 0.4s both;
    }

    .hero-tag {
        background: rgba(255, 255, 255, 0.2);
        backdrop-filter: blur(10px);
        padding: 0.5rem 1rem;
        border-radius: 25px;
        color: white;
        font-weight: 500;
        border: 1px solid rgba(255, 255, 255, 0.3);
        transition: all 0.3s ease;
    }

    .hero-tag:hover {
        background: rgba(255, 255, 255, 0.3);
        transform: translateY(-2px);
    }

    .hero-buttons {
        display: flex;
        gap: 1rem;
        flex-wrap: wrap;
        animation: fadeInUp 1s ease-out 0.6s both;
    }

    /* =============================================
       BUTTON STYLES
       ============================================= */
    .btn-primary-custom {
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        border: none;
        padding: 0.75rem 2rem;
        border-radius: 25px;
        font-weight: 600;
        color: white;
        text-decoration: none;
        display: inline-flex;
        align-items: center;
        gap: 0.5rem;
        transition: all 0.3s ease;
        box-shadow: var(--shadow-soft);
    }

    .btn-primary-custom:hover {
        transform: translateY(-3px);
        box-shadow: var(--shadow-hover);
        color: white;
    }

    .btn-outline-custom {
        background: rgba(255, 255, 255, 0.2);
        backdrop-filter: blur(10px);
        border: 2px solid rgba(255, 255, 255, 0.3);
        padding: 0.75rem 2rem;
        border-radius: 25px;
        font-weight: 600;
        color: white;
        text-decoration: none;
        display: inline-flex;
        align-items: center;
        gap: 0.5rem;
        transition: all 0.3s ease;
    }

    .btn-outline-custom:hover {
        background: rgba(255, 255, 255, 0.3);
        transform: translateY(-3px);
        color: white;
    }

    /* =============================================
       SECTION STYLES
       ============================================= */
    .section {
        padding: 5rem 0;
        position: relative;
    }

    .section-title {
        font-size: 2.5rem;
        font-weight: 700;
        text-align: center;
        margin-bottom: 4rem;
        position: relative;
        display: inline-block;
        width: 100%;
    }

    .section-title::after {
        content: '';
        position: absolute;
        bottom: -10px;
        left: 50%;
        transform: translateX(-50%);
        width: 60px;
        height: 4px;
        background: var(--gradient-primary);
        border-radius: 2px;
    }

    /* Background Patterns */
    .bg-pattern-1 {
        background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    }

    .bg-pattern-2 {
        background: linear-gradient(135deg, #fef7ff 0%, #f3e8ff 100%);
    }

    .bg-pattern-3 {
        background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    }

    /* =============================================
       CARD COMPONENTS
       ============================================= */
    .card-modern {
        background: white;
        border-radius: 20px;
        box-shadow: var(--shadow-soft);
        border: none;
        transition: all 0.3s ease;
        overflow: hidden;
    }

    .card-modern:hover {
        transform: translateY(-10px);
        box-shadow: var(--shadow-hover);
    }

    /* Card Icons */
    .card-icon {
        width: 80px;
        height: 80px;
        border-radius: 20px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 2rem;
        color: white;
        margin-bottom: 1.5rem;
    }

    .card-icon-blue { background: var(--gradient-primary); }
    .card-icon-purple { background: var(--gradient-secondary); }
    .card-icon-cyan { background: var(--gradient-accent); }
    .card-icon-green { background: linear-gradient(135deg, #10b981, #059669); }
    .card-icon-orange { background: linear-gradient(135deg, #f59e0b, #d97706); }
    .card-icon-red { background: linear-gradient(135deg, #ef4444, #dc2626); }

    /* Project Cards */
    .project-card {
        border-radius: 20px;
        overflow: hidden;
        box-shadow: var(--shadow-soft);
        transition: all 0.3s ease;
        border: none;
        height: 100%;
    }

    .project-card:hover {
        transform: translateY(-10px);
        box-shadow: var(--shadow-hover);
    }

    .project-image {
        height: 200px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 3rem;
        color: white;
    }

    .project-image-1 { background: var(--gradient-primary); }
    .project-image-2 { background: var(--gradient-secondary); }
    .project-image-3 { background: var(--gradient-accent); }
    .project-image-4 { background: linear-gradient(135deg, #ef4444, #f97316); }

    /* =============================================
       UI COMPONENTS
       ============================================= */
    /* Badges */
    .badge-custom {
        background: rgba(99, 102, 241, 0.1);
        color: var(--primary-color);
        border: 1px solid rgba(99, 102, 241, 0.2);
        padding: 0.25rem 0.75rem;
        border-radius: 15px;
        font-size: 0.75rem;
        font-weight: 500;
        margin: 0.25rem;
    }

    /* Skill Progress Bars */
    .skill-item {
        margin-bottom: 2rem;
    }

    .skill-progress {
        height: 8px;
        background: #e5e7eb;
        border-radius: 4px;
        overflow: hidden;
        margin-top: 0.5rem;
    }

    .skill-progress-bar {
        height: 100%;
        background: var(--gradient-primary);
        border-radius: 4px;
        transition: width 2s ease-in-out;
    }

    /* Accordion */
    .accordion-button {
        background: white;
        border: none;
        box-shadow: none;
        padding: 1.5rem;
        border-radius: 20px !important;
        transition: all 0.3s ease;
        position: relative;
        overflow: hidden;
    }

    .accordion-button::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 4px;
        height: 100%;
        background: var(--gradient-primary);
        transform: scaleY(0);
        transition: transform 0.3s ease;
    }

    .accordion-button:hover::before,
    .accordion-button:not(.collapsed)::before {
        transform: scaleY(1);
    }

    .accordion-button:not(.collapsed) {
        background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.1));
        color: var(--primary-color);
        box-shadow: var(--shadow-soft);
    }

    .accordion-button:hover {
        background: rgba(99, 102, 241, 0.05);
        transform: translateY(-2px);
        box-shadow: var(--shadow-soft);
    }

    .accordion-button::after {
        background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%236366f1'%3e%3cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3e%3c/svg%3e");
        transition: transform 0.3s ease;
        width: 1.5rem;
        height: 1.5rem;
    }

    .accordion-button:not(.collapsed)::after {
        transform: rotate(180deg);
    }

    .accordion-body {
        padding: 1.5rem;
        background: white;
        border-top: 1px solid rgba(0, 0, 0, 0.05);
        line-height: 1.7;
    }

    .accordion-item {
        box-shadow: var(--shadow-soft);
        transition: all 0.3s ease;
        background: white;
    }

    .accordion-item:hover {
        box-shadow: var(--shadow-hover);
        transform: translateY(-2px);
    }

    /* =============================================
       FOOTER
       ============================================= */
    .footer {
        background-color: var(--dark-color); /* #1f2937 */
        color: var(--light-color);
        padding: 3rem 0 2rem;
    }

    .footer h4 {
        color: #fff;
    }

    .footer-links a {
        color: #9ca3af;
        text-decoration: none;
        transition: all 0.3s ease;
        font-size: 1.5rem;
        padding: 0.5rem;
        border-radius: 50%;
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .footer-links a:hover {
        color: white;
        background: rgba(255, 255, 255, 0.1);
        transform: translateY(-2px);
    }

    /* Footer Nav */
    .footer-nav a {
        color: #9ca3af;
        margin: 0 0.75rem;
        text-decoration: none;
        transition: color 0.3s ease;
        font-size: 0.95rem;
    }

    .footer-nav a:hover {
        color: #fff;
    }

    /* =============================================
       ANIMATIONS & EFFECTS
       ============================================= */
    @keyframes pulse {
        0%, 100% { opacity: 1; }
        50% { opacity: 0.5; }
    }

    @keyframes fadeInUp {
        from {
            opacity: 0;
            transform: translateY(30px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

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

    .fade-in {
        opacity: 0;
        transform: translateY(30px);
        transition: all 0.6s ease-out;
    }

    .fade-in.visible {
        opacity: 1;
        transform: translateY(0);
    }

    .loading {
        display: inline-block;
        width: 20px;
        height: 20px;
        border: 3px solid rgba(255,255,255,.3);
        border-radius: 50%;
        border-top-color: #fff;
        animation: spin 1s ease-in-out infinite;
    }

    /* =============================================
       UTILITY CLASSES
       ============================================= */
    .text-purple {
        color: #8b5cf6 !important;
    }

    /* =============================================
       RESPONSIVE STYLES
       ============================================= */
    @media (max-width: 768px) {
        .hero-title {
            font-size: 2.5rem;
        }
        
        .hero-subtitle {
            font-size: 1.2rem;
        }
        
        .hero-buttons {
            flex-direction: column;
            align-items: center;
        }
        
        .section {
            padding: 3rem 0;
        }
        
        /* Accordion adjustments */
        .accordion-button {
            padding: 1rem;
            font-size: 0.95rem;
        }

        .accordion-body {
            padding: 1rem;
            font-size: 0.9rem;
        }

        .accordion-button i {
            font-size: 0.9rem;
        }
    }