/* css/style.css */
:root {
    /* Color Palette - Ultra Minimal Light */
    --bg-color: #fafafa;
    --surface-color: #ffffff;
    --text-primary: #111111;
    --text-secondary: #555555;
    --text-tertiary: #888888;
    --accent: #000000;
    --border-color: #eaeaea;
    --hover-bg: #f0f0f0;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-slow: 0.8s cubic-bezier(0.16, 1, 0.3, 1);

    /* Layout Variables */
    --container-width: 720px;
    --section-spacing: 140px;
}

/* Dark Mode Colors */
[data-theme="dark"] {
    --bg-color: #0a0a0a;
    --surface-color: #141414;
    --text-primary: #e8e8e8;
    --text-secondary: #a0a0a0;
    --text-tertiary: #696969;
    --accent: #ffffff;
    --border-color: #252525;
    --hover-bg: #1a1a1a;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.7;
    font-size: 16px;
    font-weight: 300;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    cursor: none;
    /* Custom cursor */
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

::selection {
    background-color: rgba(0, 0, 0, 0.1);
    color: var(--text-primary);
}

[data-theme="dark"] ::selection {
    background-color: rgba(255, 255, 255, 0.15);
}

.link-btn::selection {
    background-color: rgba(255, 255, 255, 0.3);
    color: #ffffff;
}

[data-theme="dark"] .link-btn::selection {
    background-color: rgba(0, 0, 0, 0.3);
    color: #000000;
}

.link-secondary::selection {
    background-color: rgba(0, 0, 0, 0.15);
    color: var(--text-primary);
}

[data-theme="dark"] .link-secondary::selection {
    background-color: rgba(255, 255, 255, 0.15);
    color: var(--text-primary);
}

/* Custom Cursor - hidden by default, shown only on hover-capable devices */
.cursor,
.cursor-follower {
    display: none;
}

@media (hover: hover) and (pointer: fine) {
    .cursor {
        display: block;
        position: fixed;
        top: 0;
        left: 0;
        width: 6px;
        height: 6px;
        background-color: var(--accent);
        border-radius: 50%;
        transform: translate(-50%, -50%);
        pointer-events: none;
        z-index: 9999;
        transition: width 0.2s, height 0.2s, background-color 0.2s;
    }

    .cursor-follower {
        display: block;
        position: fixed;
        top: 0;
        left: 0;
        width: 32px;
        height: 32px;
        border: 1px solid rgba(0, 0, 0, 0.2);
        border-radius: 50%;
        transform: translate(-50%, -50%);
        pointer-events: none;
        z-index: 9998;
        transition: top 0.1s ease-out, left 0.1s ease-out, width 0.2s, height 0.2s, background-color 0.2s, border-color 0.2s;
    }

    [data-theme="dark"] .cursor-follower {
        border-color: rgba(255, 255, 255, 0.2);
    }

    body:hover .cursor,
    body:hover .cursor-follower {
        opacity: 1;
    }

    a,
    button {
        cursor: none;
    }
}

/* Cursor Hover States for links */
.hovering .cursor {
    background-color: transparent;
}

.hovering .cursor-follower {
    width: 48px;
    height: 48px;
    background-color: rgba(0, 0, 0, 0.05);
    border-color: transparent;
}

[data-theme="dark"] .hovering .cursor-follower {
    background-color: rgba(255, 255, 255, 0.08);
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 6px 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: color var(--transition-fast), border-color var(--transition-fast);
}

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

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
    width: 18px;
    height: 18px;
}

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

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

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

.nav-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* General Layout */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography */
h1,
h2,
h3,
h4 {
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1.2;
}

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

ul {
    list-style: none;
}

/* Header & Nav */
.header {
    padding: 24px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(250, 250, 250, 0.9);
    /* matches --bg-color but slightly transparent */
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    transition: background-color var(--transition-fast);
}

[data-theme="dark"] .header {
    background-color: rgba(10, 10, 10, 0.9);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 400;
    color: var(--text-secondary);
    position: relative;
    padding-bottom: 2px;
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 1px;
    bottom: 0;
    left: 0;
    background-color: var(--text-primary);
    transition: width var(--transition-fast);
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link:hover::after {
    width: 100%;
}

.resume-link {
    color: var(--text-primary);
    font-weight: 500;
}

/* Nav Dropdown */
.nav-dropdown {
    position: relative;
}

.nav-dropdown-toggle {
    background: none;
    border: none;
    font-family: var(--font-sans);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.nav-dropdown-toggle svg {
    transition: transform var(--transition-fast);
}

.nav-dropdown-toggle[aria-expanded="true"] svg {
    transform: rotate(180deg);
}

.nav-dropdown-menu {
    position: absolute;
    top: calc(100% + 12px);
    left: 50%;
    transform: translateX(-50%);
    min-width: 140px;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 8px 0;
    display: flex;
    flex-direction: column;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-fast), visibility var(--transition-fast), transform var(--transition-fast);
    transform: translateX(-50%) translateY(4px);
    z-index: 200;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

[data-theme="dark"] .nav-dropdown-menu {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

.nav-dropdown-menu.open {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.nav-dropdown-menu li {
    padding: 0;
}

.nav-dropdown-menu .nav-link {
    display: block;
    padding: 8px 20px;
    font-size: 0.9rem;
    white-space: nowrap;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.nav-dropdown-menu .nav-link::after {
    display: none;
}

.nav-dropdown-menu .nav-link:hover {
    background-color: var(--hover-bg);
}

/* Hero Section */
.hero {
    padding: var(--section-spacing) 0;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3rem);
    letter-spacing: -0.03em;
    margin-bottom: 8px;
}

.hero-subtitle {
    font-size: clamp(1.2rem, 3vw, 1.5rem);
    color: var(--text-secondary);
    font-weight: 400;
    margin-bottom: 24px;
}

.hero-text {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 40px;
}

.hero-links {
    display: flex;
    gap: 24px;
    align-items: center;
}

/* Buttons / Links */
.link-btn {
    display: inline-flex;
    align-items: center;
    padding: 12px 24px;
    background-color: var(--accent);
    color: var(--bg-color);
    font-weight: 500;
    font-size: 0.95rem;
    border-radius: 4px;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.link-btn:hover {
    background-color: #333333;
    color: var(--bg-color);
    transform: translateY(-2px);
}

[data-theme="dark"] .link-btn:hover {
    background-color: #cccccc;
}

.link-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.link-secondary:hover {
    background-color: var(--hover-bg);
    color: var(--text-primary);
}

[data-theme="dark"] .link-secondary:hover {
    background-color: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.25);
}

/* Sections */
.section {
    padding-bottom: var(--section-spacing);
}

.section-heading {
    margin-bottom: 48px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-tertiary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 16px;
}

.section-content p {
    margin-bottom: 24px;
    color: var(--text-secondary);
}

.sub-heading {
    font-size: 1rem;
    margin: 40px 0 24px;
}

/* Skills */
.skills-grid {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.skill-category {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.skill-category-title {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.skills-container {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.skill-tag {
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding: 6px 14px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--surface-color);
    transition: border-color var(--transition-fast);
}

.skill-tag:hover {
    border-color: var(--text-tertiary);
    color: var(--text-primary);
}

/* Projects */
.projects-container {
    display: flex;
    flex-direction: column;
    gap: 56px;
}

.project-card {
    position: relative;
}

.project-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.project-title {
    font-size: 1.25rem;
    font-weight: 500;
}

.project-links {
    display: flex;
    gap: 16px;
}

.project-links a {
    color: var(--text-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color var(--transition-fast), transform var(--transition-fast);
}

.project-links a:hover {
    color: var(--accent);
    transform: translateY(-2px);
}

.project-desc {
    font-size: 1rem;
    color: var(--text-secondary);
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 16px;
}

.project-tech span {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    font-weight: 500;
}

/* Education Timeline */
.timeline {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.timeline-item {
    display: flex;
    align-items: baseline;
    gap: 32px;
}

.timeline-period {
    font-size: 0.9rem;
    color: var(--text-tertiary);
    min-width: 100px;
    font-weight: 500;
}

.timeline-details {
    flex: 1;
}

.timeline-title {
    font-size: 1.1rem;
    margin-bottom: 4px;
}

.timeline-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
    margin-bottom: 8px;
}

.timeline-text {
    font-size: 0.9rem;
    margin-bottom: 0 !important;
    color: var(--text-secondary);
}

.timeline-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.timeline-list li {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    padding-left: 16px;
    position: relative;
}

.timeline-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background-color: var(--text-tertiary);
}

/* Contact */
.contact-content p {
    max-width: 600px;
    margin-bottom: 32px;
}

.contact-grid {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 24px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--surface-color);
    transition: border-color var(--transition-fast), transform var(--transition-fast);
    color: var(--text-secondary);
}

.contact-card:hover {
    border-color: var(--text-tertiary);
    transform: translateY(-2px);
    color: var(--text-primary);
}

.contact-card svg {
    flex-shrink: 0;
    color: var(--text-tertiary);
    transition: color var(--transition-fast);
}

.contact-card:hover svg {
    color: var(--text-primary);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.contact-label {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
}

.contact-value {
    font-size: 0.95rem;
    font-weight: 400;
}

/* Footer */
.footer {
    padding-bottom: 48px;
    border-top: 1px solid var(--border-color);
    padding-top: 48px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 24px;
}

.footer-links {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

.footer-link {
    font-size: 0.95rem;
    color: var(--text-secondary);
    position: relative;
    padding-bottom: 2px;
}

.footer-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 1px;
    bottom: 0;
    left: 0;
    background-color: var(--text-secondary);
    transition: width var(--transition-fast);
}

.footer-link:hover {
    color: var(--text-primary);
}

.footer-link:hover::after {
    width: 100%;
}

.copyright {
    font-size: 0.9rem;
    color: var(--text-tertiary);
}

/* Animations */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    background: none;
    border: none;
    padding: 8px;
    z-index: 200;
}

.hamburger-line {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.hamburger.active .hamburger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.hamburger.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.hamburger.active .hamburger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --section-spacing: 96px;
    }

    .header {
        padding: 16px 0;
    }

    .hamburger {
        display: flex;
    }

    .nav-right {
        z-index: 200;
    }

    .nav-links {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 32px;
        background-color: var(--bg-color);
        z-index: 150;
        opacity: 0;
        visibility: hidden;
        transition: opacity var(--transition-normal), visibility var(--transition-normal);
    }

    .nav-links.open {
        opacity: 1;
        visibility: visible;
    }

    .nav-link {
        font-size: 1.2rem;
    }

    /* Flatten dropdown in mobile menu */
    .nav-dropdown {
        display: contents;
    }

    .nav-dropdown-toggle {
        display: none;
    }

    .nav-dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        background: none;
        border: none;
        box-shadow: none;
        padding: 0;
        gap: 32px;
        align-items: center;
        min-width: unset;
    }

    .nav-dropdown-menu .nav-link {
        padding: 0;
        font-size: 1.2rem;
    }

    .nav-dropdown-menu .nav-link:hover {
        background-color: transparent;
    }

    .timeline-item {
        flex-direction: column;
        gap: 8px;
    }

    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
    }
}