/* ═══════════════════════════════════════════════════════════════════
   CSS VARIABLES - THEME TOKENS
═══════════════════════════════════════════════════════════════════ */
:root {
    --accent: #00C4CC;
    --accent2: #7D2AE8;
}

[data-theme="dark"] {
    --bg: #000000;
    --bg-card: #0a0a0a;
    --bg-card-hover: #0f0f0f;
    --bg-nav: rgba(8, 8, 8, 0.88);
    --border: #1a1a1a;
    --border-mid: #222;
    --border-hover: #555;
    --text-primary: #FFFFFF;
    --text-secondary: #BBBBBB;
    --text-muted: #888888;
    --title-grad: linear-gradient(to right, #ffffff, #888888);
}

[data-theme="light"] {
    --bg: #f0f2f5;
    --bg-card: #ffffff;
    --bg-card-hover: #f8f9fa;
    --bg-nav: rgba(240, 242, 245, 0.92);
    --border: #e0e0e0;
    --border-mid: #cccccc;
    --border-hover: #999;
    --text-primary: #111111;
    --text-secondary: #444444;
    --text-muted: #666666;
    --title-grad: linear-gradient(to right, #111111, #444444);
}

/* ═══════════════════════════════════════════════════════════════════
   GLOBAL RESET
═══════════════════════════════════════════════════════════════════ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

body {
    background-color: var(--bg);
    color: var(--text-primary);
    font-family: 'Rajdhani', sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
}

h1,
h2,
h3 {
    font-family: 'Orbitron', sans-serif;
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* ═══════════════════════════════════════════════════════════════════
   TOP NAVBAR
═══════════════════════════════════════════════════════════════════ */
.topnav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.2rem 4rem;
    background: var(--bg-nav);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    transition: padding 0.3s ease, background 0.3s ease;
}

.topnav.scrolled {
    padding: 0.7rem 4rem;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
}

/* Logo */
.topnav-logo {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 3px;
}

/* Nav Links */
.topnav-links {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.topnav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.75rem;
    letter-spacing: 1.5px;
    transition: color 0.3s;
    position: relative;
    padding-bottom: 4px;
}

.topnav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent);
    transition: width 0.3s ease;
}

.topnav-links a:hover {
    color: var(--text-primary);
}

.topnav-links a:hover::after {
    width: 100%;
}

/* Controls (language + theme) */
.topnav-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* Shared button base */
.lang-btn,
.theme-btn {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    background: transparent;
    border: 1px solid var(--border-mid);
    color: var(--text-secondary);
    padding: 0.45rem 0.9rem;
    border-radius: 6px;
    cursor: pointer;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.7rem;
    letter-spacing: 1px;
    transition: all 0.25s;
}

.lang-btn:hover,
.theme-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(0, 196, 204, 0.05);
}

/* ═══════════════════════════════════════════════════════════════════
   LAYOUT CONTAINER
═══════════════════════════════════════════════════════════════════ */
.content {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem 4rem;
    padding-top: calc(80px + 2rem);
    /* account for fixed topnav */
    display: flex;
    flex-direction: column;
}

/* ═══════════════════════════════════════════════════════════════════
   HERO SECTION
═══════════════════════════════════════════════════════════════════ */
.hero-section {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    text-align: left;
    height: 90vh;
    width: 100%;
    position: relative;
}

.hero-content {
    flex: 1;
    z-index: 2;
}

.main-title {
    font-size: 7rem;
    font-weight: 700;
    background: var(--title-grad);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 0.9;
    margin-bottom: 1.5rem;
    letter-spacing: -2px;
}

.sub-title {
    font-size: 2.5rem;
    color: var(--accent);
    font-weight: 400;
    letter-spacing: 8px;
    text-transform: uppercase;
    opacity: 0.9;
}

/* Portrait */
.portrait-container {
    width: 580px;
    height: 600px;
    position: relative;
    z-index: 1;
    display: flex;
    justify-content: center;
    align-items: flex-end;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid transparent;
    background-image: linear-gradient(var(--bg), var(--bg)), linear-gradient(135deg, #00C4CC, #ffffff);
    background-origin: border-box;
    background-clip: padding-box, border-box;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center top;
    filter: drop-shadow(0 0 20px rgba(0, 0, 0, 0.5));
}

/* ═══════════════════════════════════════════════════════════════════
   SECTIONS COMMON
═══════════════════════════════════════════════════════════════════ */
section {
    width: 100%;
    margin-bottom: 8rem;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.glass-header {
    background: transparent;
    padding: 0;
    border: none;
    margin-bottom: 3rem;
    border-left: 4px solid var(--accent);
    padding-left: 1rem;
}

.section-title {
    font-size: 2rem;
    color: var(--text-primary);
    margin: 0;
    letter-spacing: 4px;
}

/* ═══════════════════════════════════════════════════════════════════
   ABOUT
═══════════════════════════════════════════════════════════════════ */
.about-text {
    max-width: 800px;
    text-align: left;
    font-size: 1.2rem;
    color: var(--text-secondary);
    line-height: 1.8;
    font-weight: 300;
}

/* ═══════════════════════════════════════════════════════════════════
   PROJECTS
═══════════════════════════════════════════════════════════════════ */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    width: 100%;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 2px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 1.5rem;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 2px;
    height: 100%;
    background: linear-gradient(to bottom, var(--accent), transparent);
    opacity: 0;
    transition: opacity 0.3s;
}

.project-card:hover {
    transform: translateY(-10px);
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
}

.project-card:hover::before {
    opacity: 1;
}

.project-icon-wrapper {
    width: 100%;
    height: 200px;
    background: radial-gradient(circle at center, rgba(0, 196, 204, 0.04), transparent 70%);
    border-radius: 4px;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.project-icon {
    width: 90%;
    height: 90%;
    object-fit: contain;
    filter: drop-shadow(0 0 10px rgba(100, 100, 255, 0.2));
    transition: transform 0.5s ease;
}

.project-card:hover .project-icon {
    transform: scale(1.1);
    filter: drop-shadow(0 0 15px rgba(0, 196, 204, 0.4));
}

.project-details {
    width: 100%;
}

.project-details h3 {
    font-size: 1.1rem;
    margin-bottom: 0.8rem;
    color: var(--text-primary);
    font-family: 'Orbitron', sans-serif;
    letter-spacing: 1px;
}

.project-details p {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* ═══════════════════════════════════════════════════════════════════
   CONTACT
═══════════════════════════════════════════════════════════════════ */
.contact-section {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-mid);
    padding-top: 4rem;
}

.social-links {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.social-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-mid);
    color: var(--text-muted);
    text-decoration: none;
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.9rem;
    letter-spacing: 1px;
    transition: all 0.3s;
}

.social-item img {
    width: 20px;
    height: 20px;
    filter: invert(1);
    opacity: 0.7;
    transition: opacity 0.3s;
}

[data-theme="light"] .social-item img {
    filter: invert(0);
}

.social-item:hover {
    background: var(--bg-card);
    border-color: var(--border-hover);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.social-item:hover img {
    opacity: 1;
}

.cv-download-wrapper {
    margin-left: auto;
}

.cv-button {
    display: inline-block;
    background: transparent;
    border: 1px solid var(--accent);
    color: var(--accent);
    padding: 0.8rem 2.5rem;
    font-family: 'Orbitron', sans-serif;
    text-decoration: none;
    font-size: 0.85rem;
    letter-spacing: 2px;
    transition: all 0.3s;
    border-radius: 2px;
}

.cv-button:hover {
    background: rgba(0, 196, 204, 0.1);
    box-shadow: 0 0 30px rgba(0, 196, 204, 0.2);
}

/* ═══════════════════════════════════════════════════════════════════
   SCROLL ANIMATIONS
═══════════════════════════════════════════════════════════════════ */
.hidden {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

.project-card.hidden:nth-child(1) {
    transition-delay: 0.05s;
}

.project-card.hidden:nth-child(2) {
    transition-delay: 0.15s;
}

.project-card.hidden:nth-child(3) {
    transition-delay: 0.25s;
}

.project-card.hidden:nth-child(4) {
    transition-delay: 0.35s;
}

.project-card.hidden:nth-child(5) {
    transition-delay: 0.45s;
}

/* ═══════════════════════════════════════════════════════════════════
   RESPONSIVE
═══════════════════════════════════════════════════════════════════ */
@media (max-width: 1100px) {
    .main-title {
        font-size: 5rem;
    }

    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .topnav {
        padding: 0.8rem 1.5rem;
    }

    .topnav.scrolled {
        padding: 0.5rem 1.5rem;
    }

    .topnav-links {
        display: none;
    }

    .content {
        padding: 1rem 1.5rem;
        padding-top: calc(70px + 1rem);
    }

    .hero-section {
        flex-direction: column-reverse;
        justify-content: center;
        text-align: center;
        height: auto;
        padding: 3rem 0;
    }

    .hero-content {
        margin-top: 2rem;
    }

    .main-title {
        font-size: 3rem;
        letter-spacing: -1px;
    }

    .sub-title {
        font-size: 1.3rem;
        letter-spacing: 4px;
    }

    .portrait-container {
        width: 300px;
        height: 320px;
    }

    .section-title {
        font-size: 1.5rem;
    }

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

    .contact-section {
        flex-direction: column;
        gap: 2rem;
        align-items: flex-start;
    }

    .cv-download-wrapper {
        margin-left: 0;
    }
}