/* Root Variables - Claude/Anthropic-inspired */
:root {
    --color-primary: #D97757;
    --color-primary-dark: #C15C3C;
    --color-primary-light: #F4E5DF;
    --color-text: #1A1A1A;
    --color-text-secondary: #666666;
    --color-text-muted: #999999;
    --color-background: #FAFAF9;
    --color-background-secondary: #FFFFFF;
    --color-border: #E5E5E5;
    --color-border-light: #F0F0F0;

    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 3rem;
    --spacing-xl: 5rem;
    --spacing-2xl: 7rem;

    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-loose: 1.7;

    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;

    --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 24px rgba(0, 0, 0, 0.1);

    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    color: var(--color-text);
    background-color: var(--color-background);
    line-height: var(--line-height-normal);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: var(--line-height-tight);
    color: var(--color-text);
}

h1 { font-size: clamp(2.25rem, 6vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.25rem); }
h3 { font-size: clamp(1.125rem, 2.5vw, 1.375rem); }
h4 { font-size: 1.0625rem; }

p {
    line-height: var(--line-height-loose);
    color: var(--color-text-secondary);
}

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

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

/* Container */
.container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border-light);
    z-index: 1000;
    transition: var(--transition-normal);
}

.navbar.scrolled {
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 1rem var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

@media (min-width: 768px) {
    .nav-container {
        padding: 1rem var(--spacing-lg);
    }
}

.nav-logo {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: -0.01em;
}

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

.nav-menu {
    display: none;
    list-style: none;
    gap: 0.25rem;
}

@media (min-width: 768px) {
    .nav-menu {
        display: flex;
    }
}

.nav-link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    padding: 0.5rem 0.875rem;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.nav-link:hover {
    background: var(--color-background);
    color: var(--color-text);
}

.nav-link.active {
    color: var(--color-primary);
    background: var(--color-primary-light);
}

.hamburger {
    display: flex;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    padding: 0.5rem;
}

@media (min-width: 768px) {
    .hamburger {
        display: none;
    }
}

.hamburger span {
    width: 20px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: var(--transition-normal);
}

/* Mobile Menu */
@media (max-width: 767px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 61px;
        flex-direction: column;
        background: var(--color-background-secondary);
        width: 100%;
        padding: var(--spacing-md);
        transition: var(--transition-normal);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-md);
    }

    .nav-menu.active {
        left: 0;
        display: flex;
    }

    .nav-link {
        padding: 0.75rem 1rem;
    }
}

/* Section Header */
.section-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.section-number {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-primary-light);
    padding: 0.375rem 0.75rem;
    border-radius: 100px;
    letter-spacing: 0.025em;
}

.section-title {
    font-size: clamp(1.5rem, 3vw, 1.875rem);
    font-weight: 600;
    letter-spacing: -0.015em;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--spacing-2xl) 0;
    margin-top: 61px;
    background: var(--color-background-secondary);
}

.hero-content {
    max-width: 720px;
}

.hero-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    letter-spacing: 0.025em;
}

.hero-title {
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.025em;
    color: var(--color-text);
}

.hero-description {
    font-size: clamp(1.0625rem, 2vw, 1.1875rem);
    line-height: var(--line-height-loose);
    margin-bottom: var(--spacing-lg);
    max-width: 680px;
    color: var(--color-text-secondary);
}

.hero-meta {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    flex-wrap: wrap;
    font-size: 0.9375rem;
    color: var(--color-text-muted);
}

.divider {
    color: var(--color-border);
}

/* About Section */
.about {
    padding: var(--spacing-xl) 0;
}

.about-intro {
    font-size: 1.0625rem;
    margin-bottom: var(--spacing-lg);
    max-width: 720px;
    color: var(--color-text);
    line-height: var(--line-height-loose);
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.expertise-item {
    background: var(--color-background-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 2px solid var(--color-border-light);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.expertise-item:hover {
    border-color: var(--color-primary);
    box-shadow: 0 6px 16px rgba(217, 119, 87, 0.12);
    transform: translateY(-4px);
}

.expertise-item h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.expertise-item p {
    font-size: 0.9375rem;
    line-height: var(--line-height-loose);
}

.education-bar {
    background: var(--color-primary-light);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-primary-light);
}

.education-bar p {
    color: var(--color-primary-dark);
    font-size: 0.9375rem;
    font-weight: 600;
}

/* Why Section */
.why-section {
    padding: var(--spacing-xl) 0;
}

.lead-text {
    font-size: 1.0625rem;
    margin-bottom: var(--spacing-lg);
    max-width: 720px;
    color: var(--color-text);
    line-height: var(--line-height-loose);
}

.alignment-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

@media (max-width: 767px) {
    .alignment-list {
        grid-template-columns: 1fr;
    }
}

.alignment-item {
    background: var(--color-background-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 2px solid var(--color-border-light);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.alignment-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
    transition: left 0.5s ease;
}

.alignment-item:hover::before {
    left: 100%;
}

.alignment-item:hover {
    border-color: var(--color-primary);
    box-shadow: 0 8px 20px rgba(217, 119, 87, 0.15);
    transform: translateY(-4px) scale(1.01);
}

.alignment-item h4 {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    font-size: 1rem;
    color: var(--color-text);
}

.alignment-item p {
    font-size: 0.9375rem;
    max-width: 720px;
    line-height: var(--line-height-loose);
}

/* Experience Section */
.experience {
    padding: var(--spacing-xl) 0;
}

.experience-list {
    display: grid;
    gap: var(--spacing-md);
}

.experience-item {
    background: var(--color-background-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 2px solid var(--color-border-light);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.experience-item:hover {
    border-color: var(--color-primary);
    box-shadow: 0 6px 16px rgba(217, 119, 87, 0.12);
    transform: translateX(4px);
}

.experience-header {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    align-items: start;
    flex-wrap: wrap;
}

.experience-title-group h3 {
    font-size: clamp(1.0625rem, 2vw, 1.1875rem);
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--color-text);
}

.company {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

.period {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-primary-dark);
    white-space: nowrap;
    background: var(--color-primary-light);
    padding: 0.375rem 0.75rem;
    border-radius: 100px;
}

.description {
    margin-bottom: var(--spacing-sm);
    font-style: italic;
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
}

.responsibilities {
    list-style: none;
    display: grid;
    gap: 0.5rem;
}

.responsibilities li {
    padding-left: var(--spacing-md);
    position: relative;
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: var(--line-height-loose);
}

.responsibilities li::before {
    content: '';
    position: absolute;
    left: 0.5rem;
    top: 0.625rem;
    width: 4px;
    height: 4px;
    background: var(--color-primary);
    border-radius: 50%;
}

.responsibilities li strong {
    color: var(--color-text);
    font-weight: 600;
}

/* Expertise Section */
.expertise {
    padding: var(--spacing-xl) 0;
}

.expertise-columns {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-md);
}

.expertise-column {
    background: var(--color-background-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 2px solid var(--color-border-light);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.expertise-column:hover {
    border-color: var(--color-primary);
    box-shadow: 0 6px 16px rgba(217, 119, 87, 0.12);
    transform: translateY(-4px);
}

.expertise-column h4 {
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
    color: var(--color-text);
}

.expertise-column ul {
    list-style: none;
}

.expertise-column li {
    padding: 0.375rem 0;
    padding-left: 1rem;
    position: relative;
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: var(--line-height-normal);
}

.expertise-column li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.75rem;
    width: 4px;
    height: 4px;
    background: var(--color-primary);
    border-radius: 50%;
}

/* Contact Section */
.contact {
    padding: var(--spacing-xl) 0 var(--spacing-lg) 0;
}

.contact-intro {
    font-size: 1.0625rem;
    margin-bottom: var(--spacing-lg);
    max-width: 720px;
    color: var(--color-text);
    line-height: var(--line-height-loose);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-md);
}

.contact-item {
    background: var(--color-background-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 2px solid var(--color-border-light);
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.contact-item:hover {
    border-color: var(--color-primary);
    box-shadow: 0 6px 16px rgba(217, 119, 87, 0.12);
    transform: translateY(-4px);
}

.contact-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.contact-item a {
    font-size: 0.9375rem;
    color: var(--color-primary);
    font-weight: 500;
}

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

.contact-item p {
    font-size: 0.9375rem;
    color: var(--color-text);
    margin: 0;
    font-weight: 500;
}

.contact-item small {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

/* Footer */
.footer {
    padding: var(--spacing-lg) 0 var(--spacing-md) 0;
    border-top: 1px solid var(--color-border-light);
    background: var(--color-background-secondary);
}

.footer p {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    text-align: center;
}

/* Responsive Typography */
@media (max-width: 767px) {
    html {
        font-size: 15px;
    }

    .hero {
        min-height: auto;
        padding: var(--spacing-xl) 0 var(--spacing-lg) 0;
    }

    .about,
    .why-section,
    .experience,
    .expertise,
    .contact {
        padding: var(--spacing-lg) 0;
    }

    .section-header {
        margin-bottom: var(--spacing-md);
    }

    .experience-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .period {
        align-self: flex-start;
    }

    .expertise-grid,
    .alignment-list,
    .expertise-columns,
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

/* Utility Classes */
.fade-in {
    animation: fadeIn 0.4s ease-out;
}

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

/* Selection */
::selection {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
}

::-moz-selection {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
}

/* ============================================
   Easter Egg Styles
   ============================================ */

.secret-modal {
    background: var(--color-background-secondary);
    border-radius: var(--radius-lg);
    max-width: 700px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.secret-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border-light);
}

.secret-header h2 {
    color: var(--color-primary);
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
}

.secret-close {
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--color-text-muted);
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.secret-close:hover {
    background: var(--color-background);
    color: var(--color-text);
}

.secret-content {
    padding: var(--spacing-lg) var(--spacing-md);
}

.secret-intro {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.secret-content p {
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    line-height: var(--line-height-loose);
}

.secret-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.secret-item {
    background: var(--color-background);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-light);
}

.secret-emoji {
    font-size: 2rem;
    display: block;
    margin-bottom: var(--spacing-xs);
}

.secret-item strong {
    display: block;
    color: var(--color-text);
    font-size: 1.0625rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.secret-item p {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    margin: 0;
}

.secret-closing {
    font-size: 1.0625rem;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.secret-signature {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border-light);
}

.secret-signature p {
    color: var(--color-text);
    margin-bottom: 0.25rem;
    font-weight: 600;
}

.secret-available {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    font-weight: 500 !important;
}

.secret-cta {
    margin-top: var(--spacing-md);
    text-align: center;
}

.secret-button {
    display: inline-block;
    padding: 0.875rem 2rem;
    background: var(--color-primary);
    color: white;
    font-weight: 600;
    border-radius: 100px;
    transition: var(--transition-normal);
    box-shadow: 0 4px 12px rgba(217, 119, 87, 0.3);
}

.secret-button:hover {
    background: var(--color-primary-dark);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(217, 119, 87, 0.4);
}

/* Confetti Animation */
@keyframes confettiFall {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}

/* Mobile adjustments for secret modal */
@media (max-width: 767px) {
    .secret-modal {
        max-height: 95vh;
    }

    .secret-header h2 {
        font-size: 1.25rem;
    }

    .secret-content {
        padding: var(--spacing-md);
    }

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

    .secret-button {
        width: 100%;
    }
}