/* ---
    Root & Theme Variables
--- */
:root {
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    
    /* Light Theme */
    --bg-light: #f9f9f9;
    --text-light: #111827;
    --text-secondary-light: #6B7280;
    --primary-light: #2563EB;
    --border-light: #E5E7EB;
    --card-bg-light: rgba(255, 255, 255, 0.8);
    --accent-gradient-light: linear-gradient(135deg, #2563EB, #7C3AED);

    /* Dark Theme */
    --bg-dark: #050505;
    --text-dark: #F3F4F6;
    --text-secondary-dark: #9CA3AF;
    --primary-dark: #3B82F6;
    --border-dark: #30363d;
    --card-bg-dark: rgba(22, 27, 34, 0.6);
    --accent-gradient-dark: linear-gradient(135deg, #60A5FA, #C084FC);

    --transition: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

html.dark-theme {
    --bg: var(--bg-dark);
    --text: var(--text-dark);
    --text-secondary: var(--text-secondary-dark);
    --primary: var(--primary-dark);
    --border: var(--border-dark);
    --card-bg: var(--card-bg-dark);
    --accent-gradient: var(--accent-gradient-dark);
    color-scheme: dark;
}

html {
    --bg: var(--bg-light);
    --text: var(--text-light);
    --text-secondary: var(--text-secondary-light);
    --primary: var(--primary-light);
    --border: var(--border-light);
    --card-bg: var(--card-bg-light);
    --accent-gradient: var(--accent-gradient-light);
    color-scheme: light;
}

/* ---
    Base & Reset
--- */
*, *::before, *::after { box-sizing: border-box; }
body {
    font-family: var(--font-sans);
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    padding: 0;
    transition: background-color var(--transition), color var(--transition);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(37, 99, 235, 0.08), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(124, 58, 237, 0.08), transparent 25%);
    background-attachment: fixed;
}

h1, h2, h3, h4, h5, h6 { margin: 0; font-weight: 500; }
p { margin: 0; line-height: 1.7; }
a { color: var(--primary); text-decoration: none; }
ul { list-style: none; padding: 0; margin: 0; }

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

section {
    padding: 7rem 0;
    border-bottom: 1px solid var(--border);
}
section:last-of-type { border-bottom: none; }

.section-intro {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 3rem;
    text-align: center;
}

/* ---
    Cursor
--- */
.cursor-dot, .cursor-outline {
    pointer-events: none;
    position: fixed;
    top: 50%;
    left: 50%;
    border-radius: 50%;
    opacity: 0;
    transform: translate(-50%, -50%);
    transition: opacity 0.3s ease-in-out, transform 0.3s ease-in-out;
}
.cursor-dot {
    width: 8px;
    height: 8px;
    background-color: white;
    z-index: 10001;
    mix-blend-mode: difference;
}
.cursor-outline {
    width: 40px;
    height: 40px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    background-color: transparent;
    z-index: 10000;
    mix-blend-mode: difference;
}
@media (pointer: coarse) {
    .cursor-dot, .cursor-outline { display: none; }
}

/* ---
    Header
--- */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    z-index: 100;
    background: transparent;
    transition: background-color 0.3s, backdrop-filter 0.3s;
}
header.scrolled {
    background-color: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
}
html.dark-theme header.scrolled {
    background-color: rgba(13, 17, 23, 0.5);
}

.logo a { font-weight: 700; font-size: 1.5rem; color: var(--text); }
.desktop-nav ul { display: flex; gap: 2.5rem; }
.desktop-nav a { color: var(--text-secondary); font-weight: 500; transition: color var(--transition); }
.desktop-nav a:hover { color: var(--text); }

.header-controls { display: flex; align-items: center; gap: 1.5rem; }
#theme-toggle {
    background: none; border: none; cursor: pointer; color: var(--text-secondary); padding: 0;
    transition: color var(--transition);
}
#theme-toggle:hover { color: var(--text); }
#theme-toggle svg { width: 22px; height: 22px; stroke-width: 2; fill: none; stroke: currentColor; }
html.dark-theme .sun { display: none; }
html:not(.dark-theme) .moon { display: none; }

/* ---
    Hero
--- */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    border-bottom: none;
}
.hero-name {
    font-size: clamp(3rem, 10vw, 6rem);
    font-weight: 700;
    color: var(--text);
    line-height: 1;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 1rem;
}
.hero-tagline {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: 300;
    color: var(--text-secondary);
    margin: 1rem 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5ch;
}
.hero-tagline span {
    display: inline-block;
    opacity: 0;
    animation: fadeIn 0.8s forwards;
}
.hero-tagline span:nth-child(1) { animation-delay: 0.2s; color: var(--primary); font-weight: 500; }
.hero-tagline span:nth-child(2) { animation-delay: 0.4s; }
.hero-tagline span:nth-child(3) { animation-delay: 0.6s; color: var(--primary); font-weight: 500; }
.hero-tagline span:nth-child(4) { animation-delay: 0.8s; }
.hero-role { margin-top: 1.5rem; color: var(--text-secondary); }

@keyframes fadeIn {
    to { opacity: 1; }
}

/* ---
    About (Story) Section
--- */
.story-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}
.story-content p {
    font-size: 1.2rem;
    color: var(--text-secondary);
}
.story-content p:first-of-type {
    color: var(--text);
    margin-bottom: 1.5rem;
}

/* ---
    Skills Section
--- */
.skills-container {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}
.skills-group h3 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
    font-weight: 500;
}
.skills-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
}
.skill-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    padding: 0.75rem 1.5rem;
    border-radius: 12px;
    font-weight: 500;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    backdrop-filter: blur(8px);
}
.skill-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: 0 10px 30px -10px rgba(37, 99, 235, 0.3);
}

/* ---
    Projects Section
--- */
.project-featured {
    display: flex;
    flex-direction: column;
    gap: 5rem;
}
.project-details { text-align: center; max-width: 750px; margin: 0 auto; }
.project-details h2 { font-size: 2.5rem; margin-bottom: 1rem; }
.project-description { color: var(--text-secondary); font-size: 1.1rem; }
.project-features { display: flex; justify-content: center; flex-wrap: wrap; gap: 1rem; margin-top: 2rem; }
.project-features li {
    background: var(--card-bg);
    border: 1px solid var(--border);
    padding: 0.5rem 1rem;
    border-radius: 99px;
    font-size: 0.9rem;
    font-weight: 500;
}

.project-visuals {
    display: grid;
    grid-template-columns: 1fr;
    gap: 4rem;
    perspective: 2000px;
}
.visuals-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}
.visuals-text { text-align: center; }
.visuals-text h3 { font-size: 1.5rem; margin-bottom: 0.5rem; }
.visuals-text p { color: var(--text-secondary); max-width: 300px; }

/* --- Device Mockups --- */
.phone-mockup, .laptop-mockup {
    position: relative;
    transition: transform 0.4s ease;
}
.phone-mockup:hover, .laptop-mockup:hover {
    transform: rotateY(-5deg) rotateX(5deg) scale(1.02);
}

/* Phone */
.phone-mockup {
    width: 280px;
    height: 560px;
    background: #111;
    border-radius: 30px;
    border: 2px solid #333;
    padding: 10px;
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
}
.phone-screen {
    background: var(--bg-dark); /* Placeholder color */
    height: 100%;
    border-radius: 20px;
    overflow: hidden;
    position: relative;
}
.phone-mockup::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 8px;
    background: #111;
    border-radius: 4px;
    z-index: 2;
}

/* Laptop */
.laptop-mockup {
    width: 100%;
    max-width: 700px;
    aspect-ratio: 16 / 10;
    background: #1c1c1e;
    border-radius: 20px;
    padding: 2%;
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
}
.laptop-screen {
    background: var(--bg-dark); /* Placeholder color */
    height: 100%;
    border-radius: 12px;
    overflow: hidden;
    position: relative;
}
.laptop-mockup::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 10%;
    width: 80%;
    height: 10px;
    background: #0e0e0f;
    border-radius: 0 0 10px 10px;
}

/* Carousel inside mockups */
.carousel-item {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity 0.6s ease;
    background-color: #333; /* Placeholder */
}
.carousel-item.active { opacity: 1; z-index: 1; }

/* ---
    Thinking Section
--- */
.thinking-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}
.thinking-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    padding: 2rem;
    border-radius: 12px;
    backdrop-filter: blur(8px);
    transition: border-color var(--transition), transform var(--transition);
}
.thinking-card:hover { border-color: var(--primary); transform: translateY(-5px); }
.thinking-card h3 { font-size: 1.25rem; margin-bottom: 1rem; color: var(--primary); }
.thinking-card p { color: var(--text-secondary); }

/* ---
    Education Section
--- */
.education-list { max-width: 700px; margin: 0 auto; text-align: center; }
.education-item:not(:last-child) { margin-bottom: 2rem; }
.education-item h3 { font-size: 1.25rem; }
.education-item p { color: var(--text-secondary); }

/* ---
    Contact Section
--- */
#contact { text-align: center; }
#contact h2 { font-size: 3rem; }
#contact p { max-width: 500px; margin: 1rem auto 2rem; color: var(--text-secondary); }
.contact-links { display: flex; flex-direction: column; align-items: center; gap: 1rem; }
.contact-link {
    font-size: 1.2rem;
    font-weight: 500;
    position: relative;
    padding-bottom: 5px;
}
.contact-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0%;
    height: 2px;
    background: var(--primary);
    transition: width var(--transition);
}
.contact-link:hover::after { width: 100%; }
.social-links { display: flex; gap: 2rem; margin-top: 1rem; }
.social-links a { color: var(--text-secondary); font-weight: 500; transition: color var(--transition); }
.social-links a:hover { color: var(--primary); }

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-secondary); }

/* ---
    Footer
--- */
footer { text-align: center; padding: 2rem 0; font-size: 0.9rem; color: var(--text-secondary); }

/* ---
    Mobile Navigation & Responsiveness
--- */
.mobile-nav-toggle { display: none; }
.mobile-nav { display: none; }

@media (max-width: 768px) {
    .desktop-nav { display: none; }
    .mobile-nav-toggle {
        display: block;
        background: none; border: none; cursor: pointer;
        width: 24px; height: 24px;
        position: relative;
        z-index: 1000;
    }
    .mobile-nav-toggle span {
        display: block;
        width: 100%;
        height: 2px;
        background: var(--text);
        position: absolute;
        left: 0;
        transition: transform 0.3s, opacity 0.3s;
    }
    .mobile-nav-toggle span:first-child { top: 6px; }
    .mobile-nav-toggle span:last-child { bottom: 6px; }

    body.mobile-nav-open .mobile-nav-toggle span:first-child { transform: translateY(5px) rotate(45deg); }
    body.mobile-nav-open .mobile-nav-toggle span:last-child { transform: translateY(-5px) rotate(-45deg); }

    .mobile-nav {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: var(--bg);
        display: flex;
        justify-content: center;
        align-items: center;
        transform: translateX(100%);
        transition: transform 0.4s cubic-bezier(0.25, 1, 0.5, 1);
        z-index: 999;
    }
    body.mobile-nav-open .mobile-nav { transform: translateX(0); }
    .mobile-nav ul { text-align: center; }
    .mobile-nav li { margin: 1rem 0; }
    .mobile-nav a { font-size: 2rem; font-weight: 700; padding: 0.5rem 1rem; }

    section { padding: 5rem 0; }
    .project-visuals { grid-template-columns: 1fr; }
}

/* ---
    Scroll Reveal
--- */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}
.scroll-reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}