/* ----------------------------------------------- */
/* CSS CUSTOM PROPERTIES                           */
/* ----------------------------------------------- */
:root {
    --color-primary: #1C70A0;
    --color-primary-dark: #155d87;
    --color-navy: #182153;
    --color-navy-light: #1e2a66;
    --color-text: #555;
    --color-text-light: #718096;
    --color-text-muted: #a0aec0;
    --color-bg: #ffffff;
    --color-bg-alt: #f4f4f4;
    --color-accent: #1C70A0;
    --color-border: #e2e8f0;

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 1rem;
    --font-size-sm: 0.875rem;
    --font-size-xs: 0.8125rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: clamp(1.5rem, 3vw, 2rem);
    --font-size-3xl: clamp(2rem, 5vw, 3.5rem);

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 5rem;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);

    --nav-height: 64px;
    --container-max: 1100px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    font-weight: 400;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

a:hover {
    color: var(--color-accent);
}

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

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

.section {
    padding: var(--spacing-2xl) 0;
}

.section-alt {
    background-color: var(--color-bg-alt);
}

/* ----------------------------------------------- */
/* NAVIGATION                                      */
/* ----------------------------------------------- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    z-index: 1000;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.nav.scrolled {
    background-color: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--shadow-sm);
}

.nav-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: #fff;
    text-decoration: none;
    letter-spacing: -0.5px;
    transition: color 0.3s ease;
}

.nav.scrolled .nav-logo {
    color: var(--color-navy);
}

.nav-links {
    list-style: none;
    display: flex;
    gap: var(--spacing-md);
}

.nav-links a {
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 500;
    padding: var(--spacing-xs) 0;
    position: relative;
    transition: color 0.3s ease;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width 0.3s ease;
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.nav.scrolled .nav-links a {
    color: var(--color-text);
}

.nav.scrolled .nav-links a:hover {
    color: var(--color-primary);
}

/* Mobile nav toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background-color: #fff;
    border-radius: 2px;
    transition: background-color 0.3s ease, transform 0.3s ease;
}

.nav.scrolled .nav-toggle span {
    background-color: var(--color-navy);
}

/* ----------------------------------------------- */
/* HERO                                            */
/* ----------------------------------------------- */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    background-image: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url(img/code-blur.png);
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: var(--spacing-lg);
}

.hero-name {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: #fff;
    letter-spacing: -1px;
    margin-bottom: var(--spacing-sm);
    animation: fadeInUp 0.8s ease-out;
}

.hero-name::after {
    content: '';
    display: block;
    width: 80px;
    height: 3px;
    background: var(--color-primary);
    margin: var(--spacing-md) auto 0;
    border-radius: 2px;
}

.hero-subtitle {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--font-size-lg);
    font-weight: 400;
    margin-top: var(--spacing-md);
    letter-spacing: 2px;
    text-transform: uppercase;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-links {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-xl);
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.hero-link {
    color: rgba(255, 255, 255, 0.6);
    transition: color 0.2s ease, transform 0.2s ease;
}

.hero-link:hover {
    color: #fff;
    transform: translateY(-2px);
}

.hero-scroll {
    position: absolute;
    bottom: var(--spacing-lg);
    z-index: 1;
    animation: bounce 2s ease-in-out infinite;
}

.hero-scroll a {
    color: rgba(255, 255, 255, 0.4);
    transition: color 0.2s ease;
}

.hero-scroll a:hover {
    color: rgba(255, 255, 255, 0.8);
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ----------------------------------------------- */
/* SECTION TITLES                                  */
/* ----------------------------------------------- */
.section-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-navy);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    letter-spacing: -0.5px;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--color-primary);
    margin: var(--spacing-sm) auto 0;
    border-radius: 2px;
}

/* ----------------------------------------------- */
/* ABOUT                                           */
/* ----------------------------------------------- */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 250px;
    gap: var(--spacing-2xl);
    align-items: start;
}

.about-text p {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
    font-size: var(--font-size-base);
    line-height: 1.8;
}

.about-contact {
    margin-top: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.contact-item {
    font-size: var(--font-size-sm);
}

.contact-item strong {
    color: var(--color-navy);
    font-weight: 600;
    margin-right: var(--spacing-xs);
}

.contact-item a {
    color: var(--color-primary);
}

.about-photo {
    display: flex;
    justify-content: center;
}

.profile-pic {
    width: 200px;
    height: 200px;
    object-fit: cover;
    border-radius: 50%;
    border: 4px solid var(--color-bg-alt);
    box-shadow: var(--shadow-lg);
}

/* ----------------------------------------------- */
/* TIMELINE                                        */
/* ----------------------------------------------- */
.timeline {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.timeline-item {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: var(--spacing-xl);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    transition: background-color 0.2s ease;
}

.timeline-item:hover {
    background-color: rgba(26, 111, 160, 0.04);
}

.timeline-left {
    display: flex;
    flex-direction: column;
}

.timeline-left a {
    font-weight: 600;
    color: var(--color-navy);
    font-size: var(--font-size-base);
}

.timeline-left a:hover {
    color: var(--color-primary);
}

.timeline-org {
    font-weight: 600;
    color: var(--color-navy);
    font-size: var(--font-size-base);
}

.timeline-date {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-top: 4px;
}

.timeline-right h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-navy);
    margin-bottom: var(--spacing-xs);
}

.timeline-right p {
    font-size: var(--font-size-sm);
    color: var(--color-text);
    line-height: 1.7;
    margin-bottom: var(--spacing-xs);
}

.timeline-right p:last-of-type {
    margin-bottom: var(--spacing-xs);
}

.timeline-note {
    font-style: italic;
    color: var(--color-text-light) !important;
}

.timeline-location {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
    margin-top: var(--spacing-xs);
}

.timeline-location::before {
    content: '';
    display: inline-block;
    width: 12px;
    height: 12px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23a0aec0' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M21 10c0 7-9 13-9 13s-9-6-9-13a9 9 0 0 1 18 0z'/%3E%3Ccircle cx='12' cy='10' r='3'/%3E%3C/svg%3E");
    background-size: contain;
    background-repeat: no-repeat;
    flex-shrink: 0;
}

/* ----------------------------------------------- */
/* SKILLS                                          */
/* ----------------------------------------------- */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--spacing-md);
    max-width: 900px;
    margin: 0 auto;
}

.skill-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    cursor: default;
}

.skill-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.skill-icon {
    width: 48px;
    height: 48px;
    object-fit: contain;
}

.skill-card span {
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--color-text);
    text-align: center;
}

/* ----------------------------------------------- */
/* FOOTER                                          */
/* ----------------------------------------------- */
.footer {
    background-color: var(--color-navy);
    color: rgba(255, 255, 255, 0.6);
    padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-nav a {
    color: rgba(255, 255, 255, 0.6);
    font-size: var(--font-size-sm);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-nav a:hover {
    color: #fff;
}

.footer-social {
    display: flex;
    gap: var(--spacing-sm);
}

.footer-social a {
    color: rgba(255, 255, 255, 0.5);
    transition: color 0.2s ease;
}

.footer-social a:hover {
    color: #fff;
}

.footer-copy {
    text-align: center;
    font-size: var(--font-size-xs);
    margin-top: var(--spacing-lg);
    color: rgba(255, 255, 255, 0.35);
}

/* ----------------------------------------------- */
/* SCROLL ANIMATIONS                               */
/* ----------------------------------------------- */
[data-animate] {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-animate].visible {
    opacity: 1;
    transform: translateY(0);
}