/* ===========================
   CSS Custom Properties
   =========================== */
:root {
    /* Colors - Light mode */
    --color-primary: #0891B2;
    --color-primary-light: #22D3EE;
    --color-primary-dark: #0E7490;
    --color-bg: #FFFFFF;
    --color-bg-alt: #F0FCFF;
    --color-surface: #FFFFFF;
    --color-text: #0F172A;
    --color-text-muted: #64748B;
    --color-border: #E2E8F0;
    --color-shadow: rgba(15, 23, 42, 0.08);
    --color-hero-bg: #F0FCFF;
    --color-callout-overlay: rgba(8, 145, 178, 0.85);
    --color-footer-bg: #0F172A;
    --color-footer-text: #F8FAFC;
    --color-highlight: #F0FCFF;
    --nav-bg: rgba(255, 255, 255, 0.9);
    --nav-shadow: rgba(0, 0, 0, 0.05);

    /* Spacing */
    --section-padding: 6rem 0;
    --container-width: 1140px;
    --radius: 12px;
    --radius-sm: 8px;

    /* Transitions */
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --color-primary: #22D3EE;
    --color-primary-light: #67E8F9;
    --color-primary-dark: #0891B2;
    --color-bg: #0F172A;
    --color-bg-alt: #1E293B;
    --color-surface: #1E293B;
    --color-text: #F8FAFC;
    --color-text-muted: #94A3B8;
    --color-border: #334155;
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-hero-bg: #1E293B;
    --color-callout-overlay: rgba(15, 23, 42, 0.85);
    --color-footer-bg: #020617;
    --color-footer-text: #F8FAFC;
    --color-highlight: #1E293B;
    --nav-bg: rgba(15, 23, 42, 0.9);
    --nav-shadow: rgba(0, 0, 0, 0.2);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    transition: background-color var(--transition), color var(--transition);
    overflow-x: hidden;
}

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

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

a:hover {
    color: var(--color-primary-dark);
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ===========================
   Typography
   =========================== */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 3vw, 2.5rem); }
h3 { font-size: 1.25rem; }

.lead {
    font-size: 1.2rem;
    color: var(--color-text-muted);
    line-height: 1.8;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--color-primary);
    margin: 0.75rem auto 0;
    border-radius: 2px;
}

/* ===========================
   Buttons
   =========================== */
.btn {
    display: inline-block;
    padding: 0.75rem 1.75rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all var(--transition);
    border: 2px solid transparent;
    text-decoration: none;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(13, 148, 136, 0.3);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: #fff;
    transform: translateY(-2px);
}

.btn-white {
    background: #fff;
    color: var(--color-primary-dark);
    border-color: #fff;
}

.btn-white:hover {
    background: transparent;
    color: #fff;
    border-color: #fff;
    transform: translateY(-2px);
}

.btn-outline-white {
    background: transparent;
    color: #fff;
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-outline-white:hover {
    background: #fff;
    color: var(--color-primary-dark);
    border-color: #fff;
    transform: translateY(-2px);
}

/* ===========================
   Navigation
   =========================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: all var(--transition);
    border-bottom: 1px solid transparent;
}

.navbar.scrolled {
    border-bottom-color: var(--color-border);
    box-shadow: 0 1px 20px var(--nav-shadow);
}

.navbar.hidden {
    transform: translateY(-100%);
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: padding var(--transition);
}

.navbar.scrolled .nav-container {
    padding: 0.6rem 1.5rem;
}

.nav-brand {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #fff;
    font-size: 0.85rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    letter-spacing: -0.3px;
    transition: background .2s, transform .2s;
}
.nav-brand:hover {
    transform: scale(1.05);
    color: #fff;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: var(--color-text);
    font-weight: 500;
    font-size: 0.9rem;
    position: relative;
    padding: 0.25rem 0;
}

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

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

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* ── Color picker button ─────────────────────────────── */
.color-picker-wrap {
    position: relative;
}

.color-picker-btn {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: none;
    background: var(--color-border);
    color: var(--color-text-muted);
    font-size: 0.72rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.color-picker-btn:hover,
.color-picker-btn.active {
    background: var(--color-primary);
    color: #fff;
    box-shadow: 0 0 0 2px var(--color-primary);
}

/* ── Color dropdown ──────────────────────────────────── */
.color-dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    width: 240px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: 0 8px 32px var(--color-shadow);
    padding: 12px;
    z-index: 1001;
}

.color-dropdown::before {
    content: '';
    position: absolute;
    top: -6px;
    right: 14px;
    width: 12px;
    height: 12px;
    background: var(--color-surface);
    border-left: 1px solid var(--color-border);
    border-top: 1px solid var(--color-border);
    transform: rotate(45deg);
}

.color-dropdown.open {
    display: block;
    animation: dropdownFadeIn .2s ease;
}

@keyframes dropdownFadeIn {
    from { opacity: 0; transform: translateY(-6px); }
    to { opacity: 1; transform: translateY(0); }
}

.color-dropdown-label {
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: .05em;
    margin-bottom: 8px;
}

.color-dropdown-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 6px;
}

.color-dropdown-swatch {
    aspect-ratio: 1;
    border-radius: 8px;
    border: 2px solid transparent;
    cursor: pointer;
    transition: transform .15s, border-color .15s;
    position: relative;
}

.color-dropdown-swatch:hover {
    transform: scale(1.15);
    z-index: 1;
}

.color-dropdown-swatch.active {
    border-color: var(--color-text);
    box-shadow: 0 0 0 1px var(--color-surface);
}

.color-dropdown-swatch .swatch-tooltip {
    position: absolute;
    bottom: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-text);
    color: var(--color-bg);
    font-size: 0.6rem;
    font-weight: 500;
    padding: 2px 6px;
    border-radius: 4px;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity .15s;
}

.color-dropdown-swatch:hover .swatch-tooltip {
    opacity: 1;
}

.color-dropdown-custom {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid var(--color-border);
}

.color-dropdown-custom input[type="color"] {
    width: 32px;
    height: 28px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    background: var(--color-bg-alt);
    cursor: pointer;
    padding: 2px;
}

.color-dropdown-custom input[type="text"] {
    flex: 1;
    height: 28px;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    color: var(--color-text);
    padding: 0 8px;
    font-family: monospace;
    font-size: 0.75rem;
}

.color-dropdown-custom input[type="text"]:focus {
    outline: none;
    border-color: var(--color-primary);
}

.theme-toggle {
    background: var(--color-border);
    border: none;
    color: var(--color-text-muted);
    font-size: 0.75rem;
    cursor: pointer;
    padding: 3px;
    border-radius: 50px;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
    width: 52px;
    height: 28px;
}

.theme-toggle i {
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    z-index: 1;
    transition: color var(--transition);
}

.toggle-knob {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: #fff;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
    transition: transform var(--transition);
}

[data-theme="dark"] .toggle-knob {
    transform: translateX(24px);
}

[data-theme="light"] .theme-toggle .fa-sun {
    color: #f59e0b;
    filter: drop-shadow(0 0 4px rgba(245, 158, 11, 0.6));
}

[data-theme="dark"] .theme-toggle .fa-moon {
    color: #facc15;
}

.theme-toggle:hover {
    box-shadow: 0 0 0 2px var(--color-primary);
}

.nav-hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-hamburger span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all var(--transition);
}

.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--color-surface);
    z-index: 999;
    padding: 5rem 2rem;
    transition: right var(--transition);
    box-shadow: -4px 0 20px var(--color-shadow);
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu ul {
    list-style: none;
}

.mobile-menu li {
    margin-bottom: 1.5rem;
}

.mobile-menu a {
    color: var(--color-text);
    font-size: 1.2rem;
    font-weight: 500;
}

.mobile-menu a.active {
    color: var(--color-primary);
}

/* ===========================
   Hero
   =========================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-hero-bg);
    position: relative;
    padding: 6rem 1.5rem 4rem;
}

.hero-content {
    max-width: var(--container-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-greeting {
    font-size: 1.1rem;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.hero-text h1 {
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-primary-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-tagline {
    font-size: 1.2rem;
    color: var(--color-text-muted);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.hero-sub {
    font-size: 1rem;
    color: var(--color-text-muted);
    margin-bottom: 2rem;
    font-style: italic;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-image {
    display: flex;
    justify-content: center;
}

.hero-image-wrapper {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--color-primary);
    box-shadow: 0 20px 60px rgba(13, 148, 136, 0.2);
    transition: transform var(--transition-slow);
}

.hero-image-wrapper:hover {
    transform: scale(1.03);
}

.hero-image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-scroll {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.hero-scroll a {
    color: var(--color-primary);
    font-size: 1.5rem;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

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

.section-alt {
    background: var(--color-bg-alt);
    position: relative;
    overflow: hidden;
}

.section-alt::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='40' height='40' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='20' cy='20' r='1.5' fill='%23000'/%3E%3C/svg%3E") repeat;
    opacity: 0.08;
    z-index: 0;
}

[data-theme="dark"] .section-alt::before {
    background: url("data:image/svg+xml,%3Csvg width='40' height='40' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='20' cy='20' r='1.5' fill='%23fff'/%3E%3C/svg%3E") repeat;
    opacity: 0.06;
}

.section-alt .container {
    position: relative;
    z-index: 1;
}

/* ===========================
   Hobby Cards
   =========================== */
.hobby-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.hobby-card {
    background: var(--color-surface);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 2px 20px var(--color-shadow);
    transition: all var(--transition);
    border: 1px solid var(--color-border);
}

.hobby-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px var(--color-shadow);
}

.hobby-card .hobby-img-wrap {
    position: relative;
    overflow: hidden;
}

.hobby-card .hobby-img-wrap::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(13, 148, 136, 0.25) 0%, rgba(15, 23, 42, 0.15) 100%);
    transition: opacity var(--transition);
}

.hobby-card:hover .hobby-img-wrap::after {
    opacity: 0.4;
}

.hobby-card img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    transition: transform var(--transition-slow);
    filter: saturate(0.75) brightness(0.95);
}

.hobby-card:hover img {
    transform: scale(1.05);
    filter: saturate(1) brightness(1);
}

.hobby-card-content {
    padding: 1.25rem;
}

.hobby-card-content h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--color-primary-dark);
}

.hobby-card-content p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.5;
}

/* ===========================
   About
   =========================== */
.about-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 2rem;
}

.about-intro .lead {
    margin-bottom: 1rem;
}

.about-text {
    max-width: 800px;
    margin: 0 auto;
}

.about-text p {
    margin-bottom: 1rem;
    text-align: justify;
}

/* About split layout (text + photo) */
.about-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    max-width: 900px;
    margin: 0 auto;
}

.about-photo {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 12px 40px var(--color-shadow);
}

.about-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius);
    transition: transform var(--transition-slow);
}

.about-photo img:hover {
    transform: scale(1.03);
}

.about-split .about-text {
    max-width: none;
    margin: 0;
}

#aboutToggle {
    display: block;
    margin: 0 auto 2rem;
}

.about-detail {
    display: none;
    margin-top: 2rem;
    animation: fadeIn 0.5s ease;
}

.about-detail.active {
    display: block;
}

.about-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.about-col p {
    margin-bottom: 1rem;
    text-align: justify;
}

.about-highlight {
    background: var(--color-highlight);
    border-left: 3px solid var(--color-primary);
    padding: 1rem 1.25rem;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin-bottom: 1rem;
}

/* ===========================
   CTA Banner
   =========================== */
.cta-banner {
    background: var(--color-primary);
    padding: 3.5rem 1.5rem;
    text-align: center;
}

.cta-banner h3 {
    color: #fff;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

/* CTA with background photo */
.cta-with-bg {
    background: none;
    position: relative;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    padding: 5rem 1.5rem;
}

.cta-with-bg .cta-overlay {
    position: absolute;
    inset: 0;
    background: var(--color-callout-overlay);
}

.cta-with-bg .container {
    position: relative;
    z-index: 1;
}

.cta-with-bg h3 {
    font-size: 1.8rem;
}

/* ===========================
   Skills (two-column)
   =========================== */
.section-skills {
    padding: var(--section-padding);
    position: relative;
    overflow: hidden;
}

.section-skills::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='48' height='48' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 24h48M24 0v48' stroke='%23000' stroke-width='.5'/%3E%3C/svg%3E") repeat;
    opacity: 0.04;
    z-index: 0;
}

[data-theme="dark"] .section-skills::before {
    background: url("data:image/svg+xml,%3Csvg width='48' height='48' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 24h48M24 0v48' stroke='%23fff' stroke-width='.5'/%3E%3C/svg%3E") repeat;
    opacity: 0.06;
}

.section-skills .container {
    position: relative;
    z-index: 1;
}

/* Skills subtitle */
.skills-subtitle {
    text-align: center;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-text-muted);
    font-weight: 600;
    margin-bottom: 1.5rem;
}

/* Skills intro */
.skills-intro {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 3rem;
    color: var(--color-text-muted);
    font-size: 1.05rem;
}

/* Approach grid - 3 cards */
.approach-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.approach-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 2.5rem 2rem 2rem;
    transition: all var(--transition);
    text-align: left;
}

.approach-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px var(--color-shadow);
    border-color: var(--color-primary);
}

.approach-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    background: var(--color-bg-alt);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
    font-size: 1.2rem;
    color: var(--color-primary);
    transition: all var(--transition);
}

.approach-card:hover .approach-icon {
    background: var(--color-primary);
    color: #fff;
}

.approach-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
}

.approach-card p {
    font-size: 0.92rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-bottom: 1.25rem;
}

.approach-tools {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.approach-tools span {
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--color-text-muted);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 50px;
    padding: 0.2rem 0.6rem;
    transition: all var(--transition);
}

.approach-card:hover .approach-tools span {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* Tile grid */
.tile-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 1rem;
    max-width: 700px;
    margin: 0 auto 3rem;
}

.tile {
    aspect-ratio: 1;
    background: var(--color-bg-alt);
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    transition: all var(--transition);
    cursor: default;
}

.tile:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    box-shadow: 0 8px 25px rgba(13, 148, 136, 0.3);
    transform: translateY(-3px);
}

.tile i {
    font-size: 1.8rem;
    color: var(--color-primary);
    transition: all var(--transition);
}

.tile:hover i {
    color: #fff;
    transform: scale(1.15);
}

.tile span {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-align: center;
    line-height: 1.2;
    transition: color var(--transition);
}

.tile:hover span {
    color: rgba(255, 255, 255, 0.9);
}

/* Legacy two-col layout */
.skills-two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    max-width: 800px;
    margin: 0 auto;
}

.skills-column {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 2rem;
    transition: all var(--transition);
}

.skills-column:hover {
    box-shadow: 0 8px 30px var(--color-shadow);
}

.skills-col-title {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    color: var(--color-primary);
    border-bottom: 2px solid var(--color-border);
    padding-bottom: 0.75rem;
}

.skills-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.skills-list li {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.6rem 0;
    font-size: 0.95rem;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition);
}

.skills-list li:last-child {
    border-bottom: none;
}

.skills-list li:hover {
    padding-left: 0.5rem;
    color: var(--color-primary);
}

.skills-list .skill-icon {
    width: 36px;
    height: 36px;
    font-size: 1rem;
    flex-shrink: 0;
}

/* ===========================
   Skills (legacy grid - kept for reference)
   =========================== */
.skills-group {
    margin-bottom: 3rem;
}

.skills-group-title {
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 1.5rem;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 1.5rem;
    max-width: 800px;
    margin: 0 auto;
}

.skill-item {
    text-align: center;
    transition: transform var(--transition);
}

.skill-item:hover {
    transform: translateY(-3px);
}

.skill-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 0.75rem;
    font-size: 1.3rem;
    transition: all var(--transition);
}

.skill-item:hover .skill-icon {
    transform: scale(1.1);
    box-shadow: 0 4px 15px rgba(13, 148, 136, 0.3);
}

.skill-item span {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-muted);
}

/* ===========================
   Callout Section
   =========================== */
.callout-section {
    height: 350px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: url('/img/Sander-Veldscholten-US1.jpg') center center / cover no-repeat;
}

.callout-overlay {
    position: absolute;
    inset: 0;
    background: var(--color-callout-overlay);
}

.callout-section h2 {
    color: #fff;
    font-size: clamp(1.5rem, 4vw, 3rem);
    text-align: center;
    position: relative;
    z-index: 1;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

/* ===========================
   Experience
   =========================== */
.experience-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.experience-card {
    background: var(--color-surface);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 2px 20px var(--color-shadow);
    transition: all var(--transition);
    border: 1px solid var(--color-border);
}

.experience-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px var(--color-shadow);
}

.experience-card-header {
    padding: 1.5rem;
    background: var(--color-bg-alt);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100px;
}

.experience-card-header img {
    max-height: 60px;
    max-width: 160px;
    object-fit: contain;
    mix-blend-mode: multiply;
}

[data-theme="dark"] .experience-card-header {
    background: #e2e8f0;
    border-radius: var(--radius) var(--radius) 0 0;
}

.experience-card-body {
    padding: 1.5rem;
}

.experience-card-body h3 {
    margin-bottom: 0.25rem;
}

.experience-period {
    font-size: 0.85rem;
    color: var(--color-primary);
    font-weight: 600;
    display: block;
    margin-bottom: 0.75rem;
}

.experience-card-body p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 1rem;
}

.exp-toggle {
    background: none;
    border: none;
    color: var(--color-primary);
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: color var(--transition);
}

.exp-toggle:hover {
    color: var(--color-primary-dark);
}

.exp-toggle i {
    transition: transform var(--transition);
    font-size: 0.7rem;
}

.exp-toggle.active i {
    transform: rotate(180deg);
}

.exp-details {
    display: none;
    padding-top: 1rem;
    animation: fadeIn 0.3s ease;
}

.exp-details.active {
    display: block;
}

.exp-details ul {
    list-style: none;
    padding: 0;
}

.exp-details li {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    padding: 0.4rem 0;
    padding-left: 1rem;
    position: relative;
}

.exp-details li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-primary);
    transform: translateY(-50%);
}

/* Experience minor (student jobs) */
.experience-minor {
    margin-top: 3rem;
    border-top: 1px solid var(--color-border);
    padding-top: 2rem;
}

.experience-minor-item {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    padding: 0.5rem 0;
    flex-wrap: wrap;
}

.experience-minor-item h4 {
    font-size: 0.95rem;
    font-weight: 600;
    margin: 0;
}

.experience-minor-item span {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.experience-minor-item .sep {
    color: var(--color-border);
}

/* CTA Secondary */
.cta-secondary {
    background: var(--color-primary-dark);
}

/* ===========================
   Study Timeline
   =========================== */
.study-timeline {
    position: relative;
    max-width: 700px;
    margin: 0 auto;
    padding-left: 2rem;
}

.study-timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
}

.study-item {
    position: relative;
    margin-bottom: 2.5rem;
    padding-left: 2rem;
}

.study-marker {
    position: absolute;
    left: -2rem;
    top: 0.5rem;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--color-primary);
    border: 3px solid var(--color-bg);
    box-shadow: 0 0 0 2px var(--color-primary);
    transform: translateX(-6px);
}

.study-content {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: all var(--transition);
}

.study-content:hover {
    box-shadow: 0 8px 30px var(--color-shadow);
}

.study-content img {
    max-height: 40px;
    margin-bottom: 0.75rem;
}

[data-theme="light"] .study-content img {
    mix-blend-mode: multiply;
}

[data-theme="dark"] .study-content img {
    background: #fff;
    border-radius: 6px;
    padding: 0.35rem 0.75rem;
}

.study-content h3 {
    margin-bottom: 0.25rem;
}

.study-period {
    font-size: 0.85rem;
    color: var(--color-primary);
    font-weight: 600;
    display: block;
    margin-bottom: 0.5rem;
}

.study-content p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

/* ===========================
   Energy / Wishes
   =========================== */
.section-energy {
    position: relative;
    overflow: hidden;
}

.section-energy::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M30 0L60 30L30 60L0 30Z' fill='none' stroke='%23000' stroke-width='.5'/%3E%3C/svg%3E") repeat;
    opacity: 0.04;
    z-index: 0;
}

[data-theme="dark"] .section-energy::before {
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M30 0L60 30L30 60L0 30Z' fill='none' stroke='%23fff' stroke-width='.5'/%3E%3C/svg%3E") repeat;
    opacity: 0.06;
}

.section-energy .container {
    position: relative;
    z-index: 1;
}

.energy-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.energy-card {
    text-align: center;
    padding: 2.5rem 1.5rem;
    background: var(--color-surface);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

.energy-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px var(--color-shadow);
    border-color: var(--color-primary);
}

.energy-icon {
    font-size: 2.5rem;
    color: var(--color-primary);
    margin-bottom: 1.25rem;
}

.energy-card h3 {
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.energy-card small {
    color: var(--color-text-muted);
    font-size: 0.8rem;
    display: block;
    margin-bottom: 1rem;
}

.energy-card p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

/* ===========================
   Contact Form
   =========================== */
.section-contact {
    padding: 5rem 1.5rem;
}

.contact-form {
    max-width: 560px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text);
}

.form-group input,
.form-group textarea {
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-surface);
    color: var(--color-text);
    font-family: inherit;
    font-size: 0.95rem;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(8, 145, 178, 0.12);
}

[data-theme="dark"] .form-group input:focus,
[data-theme="dark"] .form-group textarea:focus {
    box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.15);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.hp-field {
    position: absolute;
    left: -9999px;
    opacity: 0;
    height: 0;
    overflow: hidden;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 2rem;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition), transform .15s;
    align-self: flex-start;
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
    color: #fff;
}

.contact-success,
.contact-error {
    max-width: 560px;
    margin: 0 auto;
    padding: 1.5rem 2rem;
    border-radius: 10px;
    text-align: center;
    font-size: 0.95rem;
}

.contact-success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #059669;
}

[data-theme="dark"] .contact-success {
    color: #34D399;
}

.contact-success i,
.contact-error i {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    display: block;
}

.contact-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #DC2626;
}

[data-theme="dark"] .contact-error {
    color: #F87171;
}

.contact-back {
    display: inline-block;
    margin-top: 1rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary);
}

/* ===========================
   Footer
   =========================== */
.footer {
    background: var(--color-footer-bg);
    color: var(--color-footer-text);
    padding: 5rem 1.5rem;
    text-align: center;
}

.footer-content {
    max-width: 500px;
    margin: 0 auto;
}

.footer-photo {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    margin: 0 auto 1.5rem;
    border: 3px solid var(--color-primary);
}

.footer h2 {
    margin-bottom: 0.5rem;
    color: var(--color-footer-text);
}

.footer-url {
    color: var(--color-primary-light);
    display: block;
    margin-bottom: 1.5rem;
}

.footer-social {
    margin-bottom: 1.5rem;
}

.footer-social a {
    color: var(--color-footer-text);
    transition: color var(--transition);
}

.footer-social a:hover {
    color: var(--color-primary-light);
}

.footer-text {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* ===========================
   Animations
   =========================== */
.animate-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

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

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Hero load animation */
@keyframes heroFadeUp {
    from { opacity: 0; transform: translateY(40px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes heroFadeIn {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
}

.hero-animate {
    opacity: 0;
    animation: heroFadeUp 0.8s ease forwards;
}

.hero-animate:nth-child(1) { animation-delay: 0.1s; }
.hero-animate:nth-child(2) { animation-delay: 0.25s; }
.hero-animate:nth-child(3) { animation-delay: 0.4s; }
.hero-animate:nth-child(4) { animation-delay: 0.55s; }
.hero-animate:nth-child(5) { animation-delay: 0.7s; }

.hero-image .hero-animate {
    animation: heroFadeIn 1s ease forwards;
    animation-delay: 0.3s;
}

/* Back to top */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #fff;
    border: none;
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
    transition: all var(--transition);
    box-shadow: 0 4px 15px rgba(13, 148, 136, 0.3);
    z-index: 99;
}

.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.back-to-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(13, 148, 136, 0.4);
}

/* ===========================
   Responsive
   =========================== */
@media (max-width: 1024px) {
    .hobby-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .experience-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .nav-hamburger {
        display: flex;
    }
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }
    .hero-cta {
        justify-content: center;
    }
    .hero-image {
        order: -1;
    }
    .hero-image-wrapper {
        width: 200px;
        height: 200px;
    }
    .hobby-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .about-columns {
        grid-template-columns: 1fr;
    }
    .about-split {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    .about-photo {
        order: -1;
        max-height: 250px;
    }
    .skills-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .skills-two-col {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    .approach-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    .experience-grid {
        grid-template-columns: 1fr;
    }
    .energy-grid {
        grid-template-columns: 1fr;
    }
    .callout-section {
        height: 250px;
    }
    .experience-minor-item {
        flex-direction: column;
        gap: 0.25rem;
    }
    .experience-minor-item .sep {
        display: none;
    }
}

@media (max-width: 480px) {
    .hobby-grid {
        grid-template-columns: 1fr;
    }
    .skills-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ===========================
   Print
   =========================== */
@media print {
    /* Reset colors for print */
    :root {
        --color-bg: #fff;
        --color-text: #000;
        --color-text-muted: #333;
        --color-primary: #0891B2;
    }

    /* Hide interactive / non-print elements */
    .navbar,
    .mobile-menu,
    .back-to-top,
    .theme-toggle,
    .hero-scroll,
    .hero-cta,
    .callout-section,
    .cta-with-bg,
    .cta-secondary,
    .exp-toggle,
    .hobby-grid,
    .section-energy::before,
    .section-alt::before,
    .section-skills::before {
        display: none !important;
    }

    /* Remove backgrounds and shadows */
    body {
        background: #fff;
        color: #000;
        font-size: 9pt;
        line-height: 1.35;
    }

    * {
        box-shadow: none !important;
        text-shadow: none !important;
    }

    /* Hero compact for print */
    .hero {
        min-height: auto;
        padding: 0.5rem 0;
        background: none;
    }

    .hero-content {
        gap: 0.5rem;
    }

    .hero-text h1 {
        font-size: 1.4rem;
        margin-bottom: 0.1rem;
    }

    .hero-greeting,
    .hero-tagline,
    .hero-sub {
        font-size: 0.8rem;
        margin-bottom: 0.1rem;
    }

    .hero-image-wrapper {
        width: 70px;
        height: 70px;
    }

    /* Section titles compact */
    .section-title {
        font-size: 1.1rem;
        margin-bottom: 0.5rem;
    }

    .section-title::after {
        margin-top: 0.3rem;
    }

    /* Sections compact */
    .section, section {
        padding: 0.4rem 0;
        background: none !important;
    }

    .container {
        max-width: 100%;
        padding: 0;
    }

    /* Energy section compact */
    .energy-intro {
        font-size: 0.8rem;
        margin-bottom: 0.5rem;
    }

    .energy-card {
        padding: 0.5rem;
    }

    .energy-card h3 {
        font-size: 0.85rem;
    }

    .energy-card p {
        font-size: 0.75rem;
    }

    .energy-icon {
        font-size: 1.2rem;
        margin-bottom: 0.25rem;
    }

    /* Cards print-friendly */
    .experience-card,
    .study-content,
    .skills-column {
        border: 1px solid #ddd;
        break-inside: avoid;
        page-break-inside: avoid;
        padding: 0.3rem;
    }

    .experience-card-header {
        min-height: auto;
        padding: 0.2rem;
    }

    .experience-card-header img {
        max-height: 20px;
        mix-blend-mode: multiply;
    }

    .experience-card-body {
        padding: 0.3rem;
    }

    .experience-card-body h3 {
        font-size: 0.75rem;
        margin-bottom: 0;
    }

    .experience-card-body p {
        font-size: 0.65rem;
        margin-bottom: 0.15rem;
    }

    .experience-period {
        font-size: 0.6rem;
        margin-bottom: 0.15rem;
    }

    /* Grids compact */
    .experience-grid {
        grid-template-columns: 1fr 1fr 1fr;
        gap: 0.3rem;
        align-items: start;
    }

    .energy-grid {
        grid-template-columns: 1fr 1fr 1fr;
        gap: 0.4rem;
    }

    /* Show all experience details */
    .exp-details {
        display: block !important;
        max-height: none !important;
        font-size: 0.7rem;
    }

    /* Skills tiles compact */
    .skills-subtitle {
        font-size: 0.7rem;
        margin-bottom: 0.4rem;
    }

    .approach-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.5rem;
    }

    .approach-card {
        padding: 0.6rem;
        border: 1px solid #ccc;
    }

    .approach-icon {
        width: 24px;
        height: 24px;
        font-size: 0.7rem;
        margin-bottom: 0.4rem;
    }

    .approach-card h3 {
        font-size: 0.8rem;
        margin-bottom: 0.3rem;
    }

    .approach-card p {
        font-size: 0.65rem;
        margin-bottom: 0.5rem;
        line-height: 1.35;
    }

    .approach-tools span {
        font-size: 0.55rem;
        padding: 0.1rem 0.35rem;
    }

    .skills-intro {
        font-size: 0.75rem;
        margin-bottom: 0.75rem;
    }

    .tile-grid {
        gap: 0.3rem;
        grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
        margin-bottom: 0.75rem;
    }

    .tile {
        border: 1px solid #ccc;
        gap: 0.2rem;
    }

    .tile i {
        font-size: 1rem;
    }

    .tile span {
        font-size: 0.6rem;
    }

    /* Study compact */
    .study-timeline {
        gap: 0.25rem;
    }

    .study-content {
        padding: 0.3rem;
    }

    .study-content h3 {
        font-size: 0.75rem;
    }

    .study-content p {
        font-size: 0.65rem;
    }

    .study-content img {
        max-height: 18px;
        margin-bottom: 0.15rem;
    }

    .study-period {
        font-size: 0.6rem;
        margin-bottom: 0.1rem;
    }

    .study-marker {
        display: none;
    }

    .study-timeline::before {
        display: none;
    }

    .study-item {
        padding-left: 0;
    }

    /* About compact */
    .about-text p {
        font-size: 0.8rem;
    }

    /* Minor experience compact */
    .experience-minor {
        padding: 0.5rem 0;
    }

    /* Links: show URL */
    a[href^="http"]::after {
        content: " (" attr(href) ")";
        font-size: 0.65em;
        color: #666;
    }

    .footer a[href^="http"]::after,
    .experience-card-header a[href^="http"]::after,
    .study-content a[href^="http"]::after {
        content: none;
    }

    /* Footer compact */
    .footer {
        background: none;
        color: #000;
        padding: 0.5rem 0;
        font-size: 0.8rem;
    }

    /* Animate-in elements should be visible */
    .animate-in, .hero-animate {
        opacity: 1 !important;
        transform: none !important;
    }

    /* Images */
    img {
        max-width: 100%;
    }
}