/* ========================================
   CSS RESET & BASE STYLES
   ======================================== */

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

/* ========================================
   CSS VARIABLES (Design System)
   ======================================== */

:root {
    /* Colors - Primary Palette (AI-themed Teal/Cyan) */
    --color-primary: #06b6d4;
    --color-primary-dark: #0891b2;
    --color-primary-light: #67e8f9;

    /* Colors - Accent (Vibrant Orange) */
    --color-accent: #f97316;
    --color-accent-dark: #ea580c;

    /* Colors - Neutrals (Modern Dark Theme) */
    --color-background: #0f172a;
    --color-surface: #1e293b;
    --color-surface-light: #334155;
    --color-text-primary: #f1f5f9;
    --color-text-secondary: #cbd5e1;
    --color-text-tertiary: #94a3b8;
    --color-border: #334155;

    /* Gradients (AI-themed) */
    --gradient-primary: linear-gradient(135deg, #06b6d4 0%, #f97316 100%);
    --gradient-surface: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    --gradient-accent: linear-gradient(135deg, #67e8f9 0%, #06b6d4 100%);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;

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

    /* Borders */
    --border-radius-sm: 0.375rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 20px rgba(6, 182, 212, 0.3);
    --shadow-accent-glow: 0 0 20px rgba(249, 115, 22, 0.3);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

/* ========================================
   BASE STYLES
   ======================================== */

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   TYPOGRAPHY
   ======================================== */

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: var(--font-size-5xl);
}

h2 {
    font-size: var(--font-size-4xl);
}

h3 {
    font-size: var(--font-size-3xl);
}

h4 {
    font-size: var(--font-size-2xl);
}

h5 {
    font-size: var(--font-size-xl);
}

h6 {
    font-size: var(--font-size-lg);
}

p {
    margin-bottom: var(--spacing-md);
}

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

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

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

.text-large {
    font-size: var(--font-size-lg);
    line-height: 1.8;
    color: var(--color-text-secondary);
}

/* ========================================
   LAYOUT
   ======================================== */

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

.section {
    padding: var(--spacing-3xl) 0;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 800;
}

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

.hero {
    padding: 6rem 0 4rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2xl);
    line-height: 1.6;
}

.hero-author {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-lg);
    background: rgba(6, 182, 212, 0.1);
    border-radius: var(--border-radius-lg);
    border: 1px solid rgba(6, 182, 212, 0.2);
}

.hero-author .author-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: var(--font-size-2xl);
    color: white;
    box-shadow: var(--shadow-md);
}

.hero-author .author-info {
    text-align: left;
}

.hero-author .author-name {
    font-weight: 700;
    font-size: var(--font-size-xl);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.hero-author .author-title {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    flex-wrap: wrap;
}

    .about-hero {
        padding: 4rem 0 2rem;
        text-align: center;
    }

    .hero-profile {
        max-width: 600px;
        margin: 0 auto;
    }

    .profile-avatar {
        margin-bottom: var(--spacing-xl);
    }

    .avatar-placeholder {
        width: 120px;
        height: 120px;
        border-radius: 50%;
        background: var(--gradient-primary);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 3rem;
        font-weight: 800;
        color: white;
        margin: 0 auto;
        box-shadow: var(--shadow-xl), var(--shadow-glow);
    }

    .profile-links {
        display: flex;
        gap: var(--spacing-md);
        justify-content: center;
        margin-top: var(--spacing-xl);
        flex-wrap: wrap;
    }

    .page-title {
        font-size: clamp(2rem, 4vw, 3.5rem);
        margin-bottom: var(--spacing-md);
    }

    .page-subtitle {
        font-size: var(--font-size-xl);
        color: var(--color-text-secondary);
        max-width: 700px;
        margin: 0 auto;
    }

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

    .about-section {
        margin-bottom: var(--spacing-3xl);
    }

    .experience-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: var(--spacing-xl);
        margin-top: var(--spacing-xl);
    }

    .experience-card {
        background: var(--color-surface);
        padding: var(--spacing-xl);
        border-radius: var(--border-radius-lg);
        border: 1px solid var(--color-border);
        transition: all var(--transition-base);
        text-align: center;
    }

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

    .experience-icon {
        font-size: 3rem;
        margin-bottom: var(--spacing-md);
    }

    .experience-card h3 {
        margin-bottom: var(--spacing-sm);
        color: var(--color-text-primary);
    }

    .experience-card p {
        color: var(--color-text-secondary);
        margin-bottom: 0;
    }

    .feature-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: var(--spacing-xl);
        margin-top: var(--spacing-xl);
    }

    .feature-card {
        background: var(--color-surface);
        padding: var(--spacing-xl);
        border-radius: var(--border-radius-lg);
        border: 1px solid var(--color-border);
        transition: all var(--transition-base);
    }

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

    .feature-icon {
        font-size: 3rem;
        margin-bottom: var(--spacing-md);
    }

    .feature-card h3 {
        margin-bottom: var(--spacing-sm);
        color: var(--color-text-primary);
    }

    .feature-card p {
        color: var(--color-text-secondary);
        margin-bottom: 0;
    }

    /* LinkedIn Page Styles */
    .linkedin-hero {
        padding: 4rem 0 2rem;
        text-align: center;
        background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(236, 72, 153, 0.1) 100%);
    }

    .linkedin-profile {
        max-width: 600px;
        margin: 0 auto;
    }

    .linkedin-cta {
        margin-top: var(--spacing-xl);
    }

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

    .linkedin-section {
        margin-bottom: var(--spacing-3xl);
    }

    .linkedin-features {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: var(--spacing-xl);
        margin-top: var(--spacing-xl);
    }

    .linkedin-feature {
        background: var(--color-surface);
        padding: var(--spacing-xl);
        border-radius: var(--border-radius-lg);
        border: 1px solid var(--color-border);
        transition: all var(--transition-base);
        text-align: center;
    }

    .linkedin-feature:hover {
        transform: translateY(-4px);
        border-color: var(--color-primary);
        box-shadow: var(--shadow-glow);
    }

    .linkedin-feature .feature-icon {
        font-size: 3rem;
        margin-bottom: var(--spacing-md);
    }

    .linkedin-feature h3 {
        margin-bottom: var(--spacing-sm);
        color: var(--color-text-primary);
    }

    .linkedin-feature p {
        color: var(--color-text-secondary);
        margin-bottom: 0;
    }

    .connection-reasons {
        background: var(--color-surface);
        padding: var(--spacing-xl);
        border-radius: var(--border-radius-lg);
        border: 1px solid var(--color-border);
        margin: var(--spacing-xl) 0;
    }

    .connection-reasons h3 {
        color: var(--color-text-primary);
        margin-bottom: var(--spacing-md);
    }

    .reasons-list {
        list-style: none;
        padding: 0;
    }

    .reasons-list li {
        padding: var(--spacing-sm) 0;
        color: var(--color-text-secondary);
        font-size: var(--font-size-lg);
    }

    .linkedin-cta-section {
        display: flex;
        gap: var(--spacing-md);
        justify-content: center;
        margin-top: var(--spacing-xl);
        flex-wrap: wrap;
    }

    /* ========================================
   POSTS GRID
   ======================================== */

    .posts-grid {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
        gap: var(--spacing-xl);
    }

    /* ========================================
   SEARCH
   ======================================== */

    .search-container {
        position: relative;
        max-width: 400px;
    }

    .search-input {
        width: 100%;
        padding: var(--spacing-md) var(--spacing-lg);
        padding-left: 2.75rem;
        background: var(--color-surface);
        border: 1px solid var(--color-border);
        border-radius: var(--border-radius-md);
        color: var(--color-text-primary);
        font-size: var(--font-size-base);
        transition: all var(--transition-base);
    }

    .search-input:focus {
        outline: none;
        border-color: var(--color-primary);
        box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    }

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

    /* ========================================
   LOADING & ERROR STATES
   ======================================== */

    .loading {
        text-align: center;
        padding: var(--spacing-3xl) 0;
        grid-column: 1 / -1;
    }

    .spinner {
        width: 50px;
        height: 50px;
        margin: 0 auto var(--spacing-md);
        border: 4px solid var(--color-surface-light);
        border-top-color: var(--color-primary);
        border-radius: 50%;
        animation: spin 1s linear infinite;
    }

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

    /* ========================================
   POST ARTICLE PAGE
   ======================================== */

    .post-article {
        padding: 2rem 0;
    }

    .post-container {
        max-width: 800px;
    }

    .post-header {
        margin-bottom: var(--spacing-2xl);
        padding-bottom: var(--spacing-2xl);
        border-bottom: 1px solid var(--color-border);
    }

    .post-meta {
        display: flex;
        gap: var(--spacing-md);
        margin-bottom: var(--spacing-lg);
        flex-wrap: wrap;
        font-size: var(--font-size-sm);
    }

    .post-category {
        background: var(--gradient-primary);
        color: white;
        padding: var(--spacing-xs) var(--spacing-md);
        border-radius: var(--border-radius-sm);
        font-weight: 600;
    }

    .post-date,
    .post-reading-time {
        color: var(--color-text-tertiary);
    }

    .post-title {
        font-size: clamp(2rem, 4vw, 3rem);
        line-height: 1.2;
        margin-bottom: var(--spacing-md);
    }

    .post-excerpt {
        font-size: var(--font-size-xl);
        color: var(--color-text-secondary);
        line-height: 1.6;
    }

    .post-author {
        margin-top: var(--spacing-xl);
    }

    .author-info {
        display: flex;
        align-items: center;
        gap: var(--spacing-md);
    }

    .author-avatar {
        width: 48px;
        height: 48px;
        border-radius: 50%;
        background: var(--gradient-primary);
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: 700;
        font-size: var(--font-size-lg);
    }

    .author-name {
        font-weight: 600;
        color: var(--color-text-primary);
    }

    .author-title {
        font-size: var(--font-size-sm);
        color: var(--color-text-tertiary);
    }

    .post-body {
        font-size: var(--font-size-lg);
        line-height: 1.8;
        color: var(--color-text-secondary);
        margin-bottom: var(--spacing-2xl);
    }

    .post-body h2 {
        margin-top: var(--spacing-2xl);
        margin-bottom: var(--spacing-lg);
        color: var(--color-text-primary);
    }

    .post-body h3 {
        margin-top: var(--spacing-xl);
        margin-bottom: var(--spacing-md);
        color: var(--color-text-primary);
    }

    .post-body code {
        background: var(--color-surface);
        padding: 0.2em 0.4em;
        border-radius: var(--border-radius-sm);
        font-size: 0.9em;
        font-family: 'Monaco', 'Courier New', monospace;
        color: var(--color-primary-light);
    }

    /* Post Images */
    .featured-image {
        width: 100%;
        max-width: 100%;
        height: auto;
        border-radius: var(--border-radius-lg);
        margin-bottom: var(--spacing-2xl);
        object-fit: cover;
        max-height: 500px;
    }

    .content-image {
        width: 100%;
        max-width: 100%;
        height: auto;
        border-radius: var(--border-radius-md);
        margin: var(--spacing-xl) 0;
        object-fit: cover;
    }

    .post-body pre {
        background: var(--color-surface);
        padding: var(--spacing-lg);
        border-radius: var(--border-radius-md);
        overflow-x: auto;
        margin: var(--spacing-lg) 0;
    }

    .post-footer {
        padding-top: var(--spacing-xl);
        border-top: 1px solid var(--color-border);
        margin-bottom: var(--spacing-2xl);
    }

    .post-tags {
        display: flex;
        gap: var(--spacing-sm);
        margin-bottom: var(--spacing-xl);
        flex-wrap: wrap;
    }

    .tag {
        background: var(--color-surface);
        color: var(--color-text-secondary);
        padding: var(--spacing-xs) var(--spacing-md);
        border-radius: var(--border-radius-sm);
        font-size: var(--font-size-sm);
        border: 1px solid var(--color-border);
    }

    .post-share h3 {
        font-size: var(--font-size-xl);
        margin-bottom: var(--spacing-md);
    }

    .share-buttons {
        display: flex;
        gap: var(--spacing-md);
        flex-wrap: wrap;
    }

    .post-navigation {
        margin-top: var(--spacing-2xl);
    }

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

    @media (max-width: 768px) {
        .hero {
            padding: 4rem 0 2rem;
        }

        .hero-cta {
            flex-direction: column;
            align-items: center;
        }

        .section-header {
            flex-direction: column;
            align-items: flex-start;
        }

        .search-container {
            width: 100%;
            max-width: none;
        }

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

        .contact-buttons {
            flex-direction: column;
        }

        .post-meta {
            font-size: var(--font-size-xs);
        }
    }

    @media (max-width: 480px) {
        :root {
            --font-size-5xl: 2rem;
            --font-size-4xl: 1.75rem;
            --font-size-3xl: 1.5rem;
        }

        .container {
            padding: 0 var(--spacing-md);
        }
    }

/* ========================================
   LINKEDIN PAGE STYLES
   ======================================== */

.linkedin-hero {
    padding: 4rem 0 2rem;
    text-align: center;
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.1) 0%, rgba(249, 115, 22, 0.1) 100%);
}

.linkedin-profile {
    max-width: 600px;
    margin: 0 auto;
}

.linkedin-cta {
    margin-top: var(--spacing-xl);
}

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

.linkedin-section {
    margin-bottom: var(--spacing-3xl);
}

.linkedin-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.linkedin-feature {
    background: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
    text-align: center;
}

.linkedin-feature:hover {
    transform: translateY(-4px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-glow);
}

.linkedin-feature .feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.linkedin-feature h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.linkedin-feature p {
    color: var(--color-text-secondary);
    margin-bottom: 0;
}

.connection-reasons {
    background: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
    margin: var(--spacing-xl) 0;
}

.connection-reasons h3 {
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.reasons-list {
    list-style: none;
    padding: 0;
}

.reasons-list li {
    padding: var(--spacing-sm) 0;
    color: var(--color-text-secondary);
    font-size: var(--font-size-lg);
}

.linkedin-cta-section {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-xl);
    flex-wrap: wrap;
}

@media (max-width: 768px) {
    .linkedin-cta-section {
        flex-direction: column;
        align-items: center;
    }
    
    .linkedin-features {
        grid-template-columns: 1fr;
    }
}