/* ===================================
   CSS Variables & Reset
   =================================== */
:root {
    /* Colors */
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #dbeafe;
    --secondary: #0f172a;
    --secondary-light: #1e293b;
    --accent: #10b981;
    --accent-light: #d1fae5;
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-muted: #9ca3af;
    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-sidebar: #0f172a;
    --border-color: #e5e7eb;
    --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);

    /* 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;

    /* 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;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms 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(--text-primary);
    background-color: var(--bg-light);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   Layout
   =================================== */
.cv-container {
    display: grid;
    grid-template-columns: 280px 1fr;
    min-height: 100vh;
    max-width: 1200px;
    margin: 0 auto;
    box-shadow: var(--shadow-lg);
    background: var(--bg-white);
}

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

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

.avatar-placeholder {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-4);
    font-size: 2.5rem;
    color: white;
    box-shadow: var(--shadow-lg);
}

.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-sm);
    color: var(--primary-light);
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.sidebar h3 {
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--primary-light);
    margin-bottom: var(--space-3);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.sidebar h3 i {
    color: var(--primary);
}

/* Contact Info */
.contact-info ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.contact-info li {
    font-size: var(--font-size-sm);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    color: rgba(255, 255, 255, 0.8);
    transition: color var(--transition-fast);
}

.contact-info li:hover {
    color: var(--primary-light);
}

.contact-info i {
    width: 18px;
    color: var(--primary);
    text-align: center;
}

/* Skills */
.skills-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.skill-tag {
    background: rgba(37, 99, 235, 0.15);
    color: var(--primary-light);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-xl);
    font-size: var(--font-size-xs);
    font-weight: 500;
    border: 1px solid rgba(37, 99, 235, 0.3);
    transition: all var(--transition-fast);
}

.skill-tag:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-1px);
}

/* Languages */
.languages-section ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.languages-section li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.8);
}

.proficiency {
    font-size: var(--font-size-xs);
    background: rgba(16, 185, 129, 0.2);
    color: var(--accent-light);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-xl);
    font-weight: 500;
}

/* Interests */
.interests-section ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.interests-section li {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.7);
    display: flex;
    align-items: center;
    gap: var(--space-2);
    position: relative;
    padding-left: var(--space-3);
}

.interests-section li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--primary);
}

/* ===================================
   Main Content
   =================================== */
.main-content {
    padding: var(--space-8) var(--space-10);
}

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

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

.section h2 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: var(--space-5);
    padding-bottom: var(--space-2);
    border-bottom: 2px solid var(--primary);
    display: flex;
    align-items: center;
    gap: var(--space-2);
    position: relative;
}

.section h2::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--accent);
}

.section h2 i {
    color: var(--primary);
    font-size: var(--font-size-lg);
}

/* About */
.about-text {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    line-height: 1.8;
    text-align: justify;
}

/* Timeline */
.timeline {
    position: relative;
    padding-left: var(--space-6);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary), var(--accent));
    border-radius: 1px;
}

.timeline-item {
    position: relative;
    padding-bottom: var(--space-8);
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 2px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--bg-white);
    border: 3px solid var(--primary);
    box-shadow: 0 0 0 3px var(--bg-white);
    z-index: 1;
}

.timeline-date {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--primary);
    margin-bottom: var(--space-1);
    white-space: nowrap;
}

.timeline-content h3 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: var(--space-1);
}

.company {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    font-weight: 400;
    margin-bottom: var(--space-3);
}

.timeline-content ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.timeline-content li {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    position: relative;
    padding-left: var(--space-4);
    line-height: 1.7;
}

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

.coursework {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2) !important;
}

.coursework li {
    background: var(--primary-light);
    color: var(--primary-dark);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-xl);
    font-size: var(--font-size-xs);
    font-weight: 500;
    padding-left: var(--space-3) !important;
}

.coursework li::before {
    display: none;
}

.achievement {
    margin-top: var(--space-3);
    padding: var(--space-3);
    background: var(--accent-light);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: #065f46;
    display: flex;
    align-items: flex-start;
    gap: var(--space-2);
    line-height: 1.6;
}

.achievement i {
    color: var(--accent);
    margin-top: 2px;
}

/* Certificates */
.certificates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-4);
}

.cert-card {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.cert-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

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

.cert-card:hover::before {
    transform: scaleX(1);
}

.cert-card i {
    font-size: 1.5rem;
    color: var(--primary);
}

.cert-card h4 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--secondary);
    line-height: 1.5;
}

.cert-date {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    font-weight: 500;
    margin-top: auto;
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--space-4);
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    border-top: 1px solid var(--border-color);
    margin-top: var(--space-8);
}

/* ===================================
   Print Styles
   =================================== */
@media print {
    .cv-container {
        box-shadow: none;
        max-width: none;
        grid-template-columns: 250px 1fr;
    }

    .sidebar {
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }

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

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

    .timeline-item {
        break-inside: avoid;
    }

    .cert-card {
        break-inside: avoid;
    }

    .footer {
        display: none;
    }

    @page {
        margin: 1cm;
        size: A4;
    }
}

/* ===================================
   Responsive
   =================================== */
@media (max-width: 900px) {
    .cv-container {
        grid-template-columns: 1fr;
        max-width: 100%;
    }

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

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

    .avatar-placeholder {
        margin: 0 0 var(--space-3);
        width: 80px;
        height: 80px;
        font-size: 2rem;
    }

    .sidebar > div {
        flex: 1;
        min-width: 200px;
    }

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

@media (max-width: 600px) {
    :root {
        --font-size-base: 0.9375rem;
    }

    .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-4);
        text-align: center;
    }

    .avatar-placeholder {
        margin: 0 auto var(--space-3);
    }

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

    .timeline {
        padding-left: var(--space-4);
    }
}

/* ===================================
   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(--primary);
    outline-offset: 2px;
}

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --primary: #1d4ed8;
        --border-color: #000;
        --text-secondary: #000;
    }
}