/* ===================================
   CSS Variables & Reset
   =================================== */
:root {
    /* Colors */
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #dbeafe;
    --color-secondary: #0f172a;
    --color-accent: #06b6d4;
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-text-muted: #94a3b8;
    --color-background: #ffffff;
    --color-surface: #f8fafc;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;

    /* Sidebar */
    --sidebar-bg: #0f172a;
    --sidebar-text: #f1f5f9;
    --sidebar-text-muted: #94a3b8;
    --sidebar-accent: #38bdf8;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 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;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;

    /* Layout */
    --sidebar-width: 280px;
    --content-max-width: 800px;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

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

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

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

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

/* ===================================
   Layout
   =================================== */
.cv-container {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    min-height: 100vh;
    max-width: 1200px;
    margin: 0 auto;
    box-shadow: var(--shadow-xl);
}

/* ===================================
   Sidebar
   =================================== */
.sidebar {
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    padding: var(--space-8) var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-8);
    position: relative;
}

.sidebar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

.profile-section {
    text-align: center;
    padding-bottom: var(--space-6);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.profile-image {
    width: 120px;
    height: 120px;
    margin: 0 auto var(--space-4);
    border-radius: 50%;
    overflow: hidden;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    padding: 4px;
}

.profile-image .avatar-placeholder {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--sidebar-bg);
}

.name {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-1);
}

.title {
    font-size: var(--font-size-base);
    color: var(--sidebar-accent);
    font-weight: 500;
}

.section-title {
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--sidebar-accent);
    margin-bottom: var(--space-4);
}

.contact-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.contact-list li {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    font-size: var(--font-size-sm);
    line-height: 1.5;
}

.contact-icon {
    font-size: var(--font-size-base);
    flex-shrink: 0;
    margin-top: 2px;
}

.contact-list a {
    color: var(--sidebar-text);
    text-decoration: none;
    transition: color var(--transition-fast);
    word-break: break-all;
}

.contact-list a:hover {
    color: var(--sidebar-accent);
}

.skill-category {
    margin-bottom: var(--space-5);
}

.skill-category h4 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--sidebar-text-muted);
    margin-bottom: var(--space-2);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.skill-tag {
    background: rgba(56, 189, 248, 0.15);
    color: var(--sidebar-accent);
    padding: var(--space-1) var(--space-3);
    border-radius: 9999px;
    font-size: var(--font-size-xs);
    font-weight: 500;
    border: 1px solid rgba(56, 189, 248, 0.3);
    transition: all var(--transition-fast);
}

.skill-tag:hover {
    background: rgba(56, 189, 248, 0.25);
    border-color: var(--sidebar-accent);
}

.language-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.language-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-2) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.language-list li:last-child {
    border-bottom: none;
}

.lang-name {
    font-weight: 500;
}

.lang-level {
    font-size: var(--font-size-sm);
    color: var(--sidebar-text-muted);
}

/* ===================================
   Main Content
   =================================== */
.main-content {
    padding: var(--space-10) var(--space-12);
    max-width: var(--content-max-width);
    width: 100%;
}

.section {
    margin-bottom: var(--space-10);
}

.section:last-child {
    margin-bottom: 0;
}

.section-heading {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-3);
    border-bottom: 2px solid var(--color-primary);
    display: inline-block;
    position: relative;
}

.section-heading::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--color-accent);
}

/* ===================================
   Summary
   =================================== */
.summary-text {
    font-size: var(--font-size-base);
    line-height: 1.8;
    color: var(--color-text-light);
    max-width: 65ch;
}

/* ===================================
   Experience
   =================================== */
.experience-item {
    margin-bottom: var(--space-8);
    padding: var(--space-6);
    background: var(--color-surface);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border-light);
    transition: all var(--transition-base);
}

.experience-item:hover {
    border-color: var(--color-border);
    box-shadow: var(--shadow-md);
}

.experience-item:last-child {
    margin-bottom: 0;
}

.experience-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-4);
    margin-bottom: var(--space-4);
    flex-wrap: wrap;
}

.job-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-secondary);
    margin-bottom: var(--space-1);
}

.company-name {
    font-size: var(--font-size-base);
    color: var(--color-primary);
    font-weight: 500;
}

.job-date {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    background: var(--color-primary-light);
    color: var(--color-primary);
    padding: var(--space-1) var(--space-3);
    border-radius: 9999px;
    font-weight: 500;
    white-space: nowrap;
    flex-shrink: 0;
}

.job-description {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.job-description li {
    position: relative;
    padding-left: var(--space-5);
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    line-height: 1.7;
}

.job-description li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.tech-tag {
    background: var(--color-background);
    color: var(--color-text);
    padding: var(--space-1) var(--space-3);
    border-radius: 9999px;
    font-size: var(--font-size-xs);
    font-weight: 500;
    border: 1px solid var(--color-border);
    transition: all var(--transition-fast);
}

.tech-tag:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* ===================================
   Projects
   =================================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-5);
}

.project-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-lg);
    padding: var(--space-5);
    transition: all var(--transition-base);
}

.project-card:hover {
    border-color: var(--color-border);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.project-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-secondary);
    margin-bottom: var(--space-2);
}

.project-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    line-height: 1.6;
    margin-bottom: var(--space-3);
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-3);
}

.project-tech span {
    background: var(--color-primary-light);
    color: var(--color-primary);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--border-radius);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.project-links {
    display: flex;
    gap: var(--space-4);
}

.project-links a {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.project-links a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

/* ===================================
   Education
   =================================== */
.education-item {
    padding: var(--space-5);
    background: var(--color-surface);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border-light);
}

.education-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-4);
    margin-bottom: var(--space-2);
    flex-wrap: wrap;
}

.degree {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-secondary);
    margin-bottom: var(--space-1);
}

.school {
    font-size: var(--font-size-base);
    color: var(--color-primary);
    font-weight: 500;
}

.education-date {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    background: var(--color-primary-light);
    color: var(--color-primary);
    padding: var(--space-1) var(--space-3);
    border-radius: 9999px;
    font-weight: 500;
    white-space: nowrap;
    flex-shrink: 0;
}

.education-detail {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

/* ===================================
   Certifications & Awards
   =================================== */
.cert-list,
.awards-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.cert-list li,
.awards-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-4);
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius);
    transition: all var(--transition-base);
}

.cert-list li:hover,
.awards-list li:hover {
    border-color: var(--color-border);
    box-shadow: var(--shadow-md);
}

.cert-name,
.award-name {
    font-weight: 500;
    color: var(--color-text);
}

.cert-date,
.award-date {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    background: var(--color-primary-light);
    color: var(--color-primary);
    padding: var(--space-1) var(--space-3);
    border-radius: 9999px;
    font-weight: 500;
    white-space: nowrap;
    flex-shrink: 0;
    margin-left: var(--space-4);
}

/* ===================================
   Footer
   =================================== */
.footer {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--space-6);
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

/* ===================================
   Print Styles
   =================================== */
@media print {
    .cv-container {
        grid-template-columns: var(--sidebar-width) 1fr;
        box-shadow: none;
        max-width: none;
    }

    .sidebar {
        background: var(--sidebar-bg) !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }

    .main-content {
        padding: var(--space-6) var(--space-8);
    }

    .section {
        margin-bottom: var(--space-6);
        break-inside: avoid;
    }

    .experience-item,
    .project-card,
    .education-item,
    .cert-list li,
    .awards-list li {
        break-inside: avoid;
    }

    .footer {
        display: none;
    }

    a {
        text-decoration: none;
        color: inherit;
    }

    @page {
        margin: 0;
        size: A4;
    }
}

/* ===================================
   Responsive
   =================================== */
@media (max-width: 900px) {
    .cv-container {
        grid-template-columns: 1fr;
    }

    .sidebar {
        padding: var(--space-6);
        flex-direction: row;
        flex-wrap: wrap;
        gap: var(--space-6);
    }

    .profile-section {
        flex: 1;
        min-width: 200px;
        text-align: left;
        border-bottom: none;
        border-right: 1px solid rgba(255, 255, 255, 0.1);
        padding-bottom: 0;
        padding-right: var(--space-6);
    }

    .profile-image {
        margin: 0 auto var(--space-3);
    }

    .skills-section,
    .languages-section,
    .contact-info {
        flex: 1;
        min-width: 180px;
    }

    .main-content {
        padding: var(--space-6) var(--space-8);
    }
}

@media (max-width: 600px) {
    :root {
        --space-10: 1.5rem;
        --space-12: 1.5rem;
    }

    .sidebar {
        flex-direction: column;
    }

    .profile-section {
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        padding-right: 0;
        padding-bottom: var(--space-6);
    }

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

    .job-date {
        align-self: flex-start;
    }

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

    .cert-list li,
    .awards-list li {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
    }

    .cert-date,
    .award-date {
        margin-left: 0;
    }

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

/* ===================================
   Dark Mode Support (Optional)
   =================================== */
@media (prefers-color-scheme: dark) {
    :root {
        --color-text: #f1f5f9;
        --color-text-light: #94a3b8;
        --color-text-muted: #64748b;
        --color-background: #0f172a;
        --color-surface: #1e293b;
        --color-border: #334155;
        --color-border-light: #1e293b;
        --color-primary-light: #1e3a5f;
    }

    .main-content {
        background: var(--color-background);
    }

    .experience-item,
    .project-card,
    .education-item,
    .cert-list li,
    .awards-list li {
        background: var(--color-surface);
        border-color: var(--color-border-light);
    }

    .tech-tag,
    .project-tech span {
        background: var(--color-primary-light);
    }
}

/* ===================================
   Accessibility
   =================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.skill-tag:focus-visible,
.tech-tag:focus-visible,
.project-links a:focus-visible,
.contact-list a:focus-visible {
    outline: 2px solid var(--sidebar-accent);
    outline-offset: 2px;
    border-radius: 9999px;
}