/* ============================================
   Custom Properties
   ============================================ */
:root {
    --color-primary: #c2410c;
    --color-primary-dark: #9a3412;
    --color-primary-light: #fff7ed;
    --color-accent: #1a56db;
    --color-bg: #ffffff;
    --color-bg-alt: #f5f5f4;
    --color-bg-dark: #1c1917;
    --color-text: #292524;
    --color-text-light: #78716c;
    --color-text-inverse: #f5f5f4;
    --color-border: #e7e5e4;

    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;

    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;

    --header-height: 72px;
    --max-width: 1100px;
    --radius: 8px;
    --radius-lg: 16px;

    --transition: 0.25s ease;
}

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

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

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

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

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

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

ul {
    list-style: none;
}

/* ============================================
   Layout
   ============================================ */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

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

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

.section-heading {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    margin-bottom: var(--space-lg);
    position: relative;
    display: inline-block;
}

.section-heading::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--color-primary);
    border-radius: 2px;
    margin-top: var(--space-xs);
}

/* ============================================
   Header / Navigation
   ============================================ */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: background var(--transition), box-shadow var(--transition);
}

.site-header.scrolled {
    box-shadow: 0 1px 8px rgba(0, 0, 0, 0.08);
}

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

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

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

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.nav-link {
    color: var(--color-text-light);
    font-size: 0.9rem;
    font-weight: 500;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius);
    transition: color var(--transition), background var(--transition);
}

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

.nav-link--cta {
    background: var(--color-primary);
    color: #fff;
    padding: 0.5rem 1.25rem;
}

.nav-link--cta:hover {
    background: var(--color-primary-dark);
    color: #fff;
}

.nav-link--cta.active {
    color: #fff;
}

/* Hamburger */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-xs);
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    position: relative;
    transition: background var(--transition);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    left: 0;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: transform var(--transition);
}

.hamburger::before {
    top: -7px;
}

.hamburger::after {
    top: 7px;
}

.nav-toggle[aria-expanded="true"] .hamburger {
    background: transparent;
}

.nav-toggle[aria-expanded="true"] .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .hamburger::after {
    top: 0;
    transform: rotate(-45deg);
}

/* ============================================
   Hero
   ============================================ */
.hero {
    padding-top: calc(var(--header-height) + var(--space-2xl));
    padding-bottom: var(--space-2xl);
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-bg) 60%);
    min-height: 80vh;
    display: flex;
    align-items: center;
}

.hero-content {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.hero-text {
    flex: 1;
}

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

.hero-name {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    color: var(--color-bg-dark);
    margin-bottom: var(--space-xs);
}

.hero-title {
    font-size: clamp(1.1rem, 2.5vw, 1.4rem);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.hero-tagline {
    font-size: 1.05rem;
    color: var(--color-text-light);
    max-width: 540px;
    margin-bottom: var(--space-lg);
}

.hero-actions {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    padding-top: 10px;
}

.hero-image {
    flex-shrink: 0;
}

.headshot {
    width: 320px;
    height: 320px;
    border-radius: 50%;
    border: 4px solid var(--color-primary);
    object-fit: cover;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-block;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 600;
    padding: 0.75rem 1.75rem;
    border-radius: var(--radius);
    cursor: pointer;
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
    text-align: center;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

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

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

.btn--outline {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

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

.btn--lg {
    padding: 1rem 2.25rem;
    font-size: 1.05rem;
}

/* ============================================
   About
   ============================================ */
.about-content p {
    margin-bottom: var(--space-sm);
    max-width: 720px;
}

.about-content p:last-child {
    margin-bottom: 0;
}

/* ============================================
   Experience
   ============================================ */
.experience-item {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    margin-bottom: var(--space-md);
}

.experience-item:last-child {
    margin-bottom: 0;
}

.experience-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-xs);
}

.experience-header h3 {
    font-size: 1.35rem;
    font-weight: 700;
}

.experience-note {
    font-weight: 400;
    color: var(--color-text-light);
    font-size: 0.95rem;
}

.experience-duration {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-primary-light);
    padding: 0.2rem 0.75rem;
    border-radius: 999px;
    white-space: nowrap;
}

.experience-role {
    color: var(--color-text-light);
    font-size: 0.95rem;
    margin-bottom: var(--space-sm);
}

.experience-item p {
    margin-bottom: var(--space-xs);
}

.experience-item p:last-child {
    margin-bottom: 0;
}

/* ============================================
   Education & Certifications
   ============================================ */
.edu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-md);
}

.edu-card {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
}

.edu-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.edu-detail {
    color: var(--color-text-light);
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
}

.edu-detail--sub {
    font-size: 0.82rem;
    margin-top: -0.15rem;
    margin-bottom: 0.75rem;
}

.verify-link {
    font-size: 0.8rem;
    font-weight: 400;
}

.cert-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.cert-list li {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    font-size: 0.85rem;
    font-weight: 500;
    padding: 0.3rem 0.75rem;
    border-radius: 999px;
    border: 1px solid var(--color-border);
}

.edu-card--highlight {
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-bg) 60%);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    grid-column: 1 / -1;
}

.edu-card--highlight h3 {
    color: var(--color-primary);
}

.edu-card--highlight a {
    color: var(--color-primary);
}

.edu-card--highlight a:hover {
    color: var(--color-primary-dark);
}

.edu-card--highlight p {
    margin-bottom: var(--space-xs);
}

.edu-card--highlight p:last-child {
    margin-bottom: 0;
}

/* ============================================
   Personal
   ============================================ */
.personal-content p {
    margin-bottom: var(--space-sm);
    max-width: 720px;
}

.personal-content p:last-child {
    margin-bottom: 0;
}

.personal-layout {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.personal-image {
    flex-shrink: 0;
}

.personal-photo {
    max-height: 400px;
    border-radius: var(--radius-lg);
    object-fit: cover;
}

/* ============================================
   Contact
   ============================================ */
.section--contact {
    background: var(--color-bg-dark);
    color: var(--color-text-inverse);
    text-align: center;
}

.section--contact .section-heading {
    color: var(--color-text-inverse);
}

.section--contact .section-heading::after {
    margin-left: auto;
    margin-right: auto;
}

.contact-content {
    max-width: 600px;
}

.contact-text {
    font-size: 1.1rem;
    color: var(--color-text-light);
    margin-bottom: var(--space-lg);
}

.contact-actions {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
    background: var(--color-bg-dark);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--color-text-light);
    text-align: center;
    padding: var(--space-md) 0;
    font-size: 0.85rem;
}

/* ============================================
   Fade-in Animations
   ============================================ */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }

    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        flex-direction: column;
        padding: var(--space-md);
        gap: 0;
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s;
    }

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

    .nav-link {
        display: block;
        padding: 0.75rem var(--space-sm);
        font-size: 1rem;
        width: 100%;
    }

    .nav-link--cta {
        text-align: center;
        margin-top: var(--space-xs);
    }

    .hero {
        min-height: auto;
        padding-top: calc(var(--header-height) + var(--space-xl));
        padding-bottom: var(--space-xl);
    }

    .hero-content {
        flex-direction: column-reverse;
        text-align: center;
    }

    .hero-tagline {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-actions {
        justify-content: center;
    }

    .headshot {
        width: 220px;
        height: 220px;
    }

    .experience-header {
        flex-direction: column;
        gap: 0.25rem;
    }

    .personal-layout {
        flex-direction: column;
    }

    .personal-image {
        text-align: center;
    }

    .personal-photo {
        max-height: 350px;
    }

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

@media (max-width: 480px) {
    .hero-name {
        font-size: 2.2rem;
    }

    .btn--lg {
        width: 100%;
    }

}