/* ========================================
   Lazar Avramovic - Portfolio
   Visual System: Minimal, architect-level
   ======================================== */

/* --- Custom Properties --- */
:root {
    --color-bg: #F8F7F4;
    --color-bg-alt: #F0EFEB;
    --color-surface: #FFFFFF;
    --color-text: #1A1A2E;
    --color-text-secondary: #4A4A5A;
    --color-text-muted: #6E6E7A;
    --color-accent: #2D5A3D;
    --color-border: #E2E0DB;
    --color-border-light: #EDECEA;

    --font-family: 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --max-width: 1060px;

    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2.5rem;
    --space-2xl: 4rem;
    --space-3xl: 5rem;

    --text-sm: 0.9375rem;
    --text-base: 1.0625rem;
    --text-lg: 1.1875rem;
    --text-xl: 1.375rem;
    --text-2xl: 1.625rem;
    --text-3xl: 2.5rem;
}

/* --- Dark Theme --- */
[data-theme="dark"] {
    --color-bg: #111113;
    --color-bg-alt: #1A1A1D;
    --color-surface: #1E1E21;
    --color-text: #E8E6E1;
    --color-text-secondary: #A8A6A0;
    --color-text-muted: #787672;
    --color-accent: #5B9A6F;
    --color-border: #2A2A2D;
    --color-border-light: #222225;
}

[data-theme="dark"] .theme-toggle .icon-sun {
    display: block;
}

[data-theme="dark"] .theme-toggle .icon-moon {
    display: none;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 5rem;
}

body {
    font-family: var(--font-family);
    font-size: var(--text-base);
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.3s ease, color 0.3s ease;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: opacity 0.2s ease;
}

a:hover {
    opacity: 0.75;
}

a:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: 2px;
}

ul {
    list-style: none;
}

img {
    display: block;
    max-width: 100%;
    height: auto;
}

/* --- Layout --- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.section {
    padding: var(--space-3xl) 0;
    border-bottom: 1px solid var(--color-border-light);
}

.section:last-of-type {
    border-bottom: none;
}

/* --- Header --- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    transition: background-color 0.3s ease;
}

.header-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--space-md) var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-lg);
}

.header-name {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: -0.01em;
    white-space: nowrap;
}

.nav-links {
    display: flex;
    gap: var(--space-lg);
}

.nav-links a {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    letter-spacing: 0.01em;
}

.nav-links a:hover {
    color: var(--color-text);
    opacity: 1;
}

.theme-toggle {
    background: none;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 6px 8px;
    cursor: pointer;
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s ease, border-color 0.2s ease;
    flex-shrink: 0;
}

.theme-toggle:hover {
    color: var(--color-text);
    border-color: var(--color-text-muted);
}

.theme-toggle .icon-sun {
    display: none;
}

.theme-toggle .icon-moon {
    display: block;
}

/* --- Hero --- */
.hero {
    padding: var(--space-3xl) 0 var(--space-2xl);
    border-bottom: 1px solid var(--color-border-light);
}

.hero-content {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-xl);
}

.hero-text {
    flex: 1;
}

.hero-name {
    font-size: var(--text-3xl);
    font-weight: 700;
    letter-spacing: -0.025em;
    line-height: 1.2;
    color: var(--color-text);
}

.hero-title {
    font-size: var(--text-lg);
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-top: var(--space-sm);
    letter-spacing: -0.01em;
}

.hero-summary {
    margin-top: var(--space-lg);
    font-size: var(--text-base);
    color: var(--color-text-secondary);
    max-width: 600px;
    line-height: 1.75;
}

.hero-links {
    display: flex;
    gap: var(--space-lg);
    margin-top: var(--space-lg);
    flex-wrap: wrap;
}

.hero-links a {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-accent);
}

.hero-cv-link {
    border: 1px solid var(--color-accent);
    padding: 0.2rem 0.7rem;
    border-radius: 4px;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.hero-cv-link:hover {
    background-color: var(--color-accent);
    color: var(--color-bg) !important;
    opacity: 1;
}

.hero-photo img {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--color-border);
    flex-shrink: 0;
}

/* --- Section Titles --- */
.section-title {
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: 0.04em;
    text-transform: uppercase;
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-md);
    border-bottom: 2px solid var(--color-accent);
    display: inline-block;
}

/* --- Philosophy --- */
.philosophy {
    padding: var(--space-2xl) 0;
}

.philosophy-text {
    border: none;
    margin: 0;
    padding: 0;
    padding-left: var(--space-lg);
    border-left: 3px solid var(--color-accent);
}

.philosophy-text p {
    font-size: var(--text-base);
    line-height: 1.85;
    color: var(--color-text-secondary);
    max-width: 780px;
}

/* --- Experience --- */
.experience-item {
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-border-light);
}

.experience-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

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

.experience-role {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: -0.01em;
}

.experience-company {
    font-size: var(--text-base);
    color: var(--color-text-secondary);
    margin-top: var(--space-xs);
}

.experience-location {
    color: var(--color-text-muted);
}

.experience-period {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-muted);
    white-space: nowrap;
    flex-shrink: 0;
    padding-top: 2px;
}

.experience-bullets {
    list-style: none;
    padding: 0;
    margin-bottom: var(--space-md);
}

.experience-bullets li {
    position: relative;
    padding-left: var(--space-lg);
    margin-bottom: var(--space-sm);
    font-size: var(--text-base);
    line-height: 1.7;
    color: var(--color-text-secondary);
}

.experience-bullets li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.7em;
    width: 5px;
    height: 5px;
    background-color: var(--color-accent);
    border-radius: 50%;
}

/* --- Tags (shared) --- */
.tech-tags,
.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.tag {
    display: inline-block;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-accent);
    background-color: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    white-space: nowrap;
    letter-spacing: 0.01em;
    line-height: 1.6;
}

/* --- Education --- */
.education-item {
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-border-light);
}

.education-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.education-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-md);
}

.education-degree {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text);
}

.education-school {
    font-size: var(--text-base);
    color: var(--color-text-secondary);
    margin-top: var(--space-xs);
}

.education-detail {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-top: var(--space-xs);
}

.education-period {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-muted);
    white-space: nowrap;
    flex-shrink: 0;
}

/* --- Skills --- */
.skills-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
}

.skill-category {
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-border-light);
}

.skill-category:last-child {
    padding-bottom: 0;
    border-bottom: none;
}

.skill-category-title {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

.skill-tags {
    gap: 0.5rem;
}

.skill-tags .tag {
    font-size: 0.875rem;
    padding: 0.25rem 0.7rem;
}

/* --- Certifications --- */
.cert-item {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-border-light);
}

.cert-item:first-child {
    padding-top: 0;
}

.cert-item:last-child {
    border-bottom: none;
}

.cert-title {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-text);
}

.cert-detail {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-top: var(--space-xs);
}

.cert-year {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-muted);
    white-space: nowrap;
    flex-shrink: 0;
}

/* --- Projects --- */
.project-item {
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-border-light);
}

.project-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.project-header {
    margin-bottom: var(--space-md);
}

.project-name {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: -0.01em;
}

.project-meta {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-top: var(--space-xs);
}

.project-period {
    color: var(--color-text-muted);
    margin-left: var(--space-sm);
}

.project-description {
    font-size: var(--text-base);
    line-height: 1.75;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
    max-width: 780px;
}

/* project tech tags use shared .tech-tags styles */

/* --- Languages --- */
.languages-list {
    display: flex;
    gap: var(--space-xl);
}

.language-item {
    display: flex;
    align-items: baseline;
    gap: var(--space-sm);
}

.language-name {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-text);
}

.language-level {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    font-weight: 500;
}

/* --- Contact --- */
.contact {
    border-bottom: none;
}

.contact-line {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
}

.contact-links {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
    flex-wrap: wrap;
}

.contact-links a {
    font-size: var(--text-base);
    font-weight: 500;
    color: var(--color-text-muted);
}

.contact-email {
    font-size: var(--text-lg) !important;
    font-weight: 600 !important;
    color: var(--color-accent) !important;
}

/* --- Footer --- */
.site-footer {
    padding: var(--space-xl) 0;
    border-top: 1px solid var(--color-border);
}

.site-footer p {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 768px) {
    :root {
        --text-3xl: 1.75rem;
        --text-2xl: 1.25rem;
        --space-3xl: 3rem;
        --space-2xl: 2.5rem;
    }

    .header-inner {
        padding: var(--space-sm) var(--space-md);
    }

    .nav-links {
        display: none;
    }

    .hero-content {
        flex-direction: column-reverse;
        align-items: flex-start;
    }

    .hero-photo img {
        width: 100px;
        height: 100px;
    }

    .experience-header {
        flex-direction: column;
        gap: var(--space-xs);
    }

    .education-header {
        flex-direction: column;
        gap: var(--space-xs);
    }

    .cert-item {
        flex-direction: column;
        gap: var(--space-xs);
    }

    .languages-list {
        flex-direction: column;
        gap: var(--space-md);
    }

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

@media (max-width: 480px) {
    :root {
        --text-3xl: 1.5rem;
        --space-3xl: 2.5rem;
    }

    .hero-links {
        flex-direction: column;
        gap: var(--space-sm);
    }
}

/* --- Print --- */
@media print {
    .site-header,
    .theme-toggle {
        display: none;
    }

    body {
        background: white;
        color: #111;
        font-size: 11pt;
    }

    .section {
        padding: 1.5rem 0;
        break-inside: avoid;
    }

    a {
        color: #111;
    }

    .philosophy-text {
        border-left-color: #333;
    }

    .experience-bullets li::before {
        background-color: #333;
    }

    .section-title {
        border-bottom-color: #333;
    }
}