/**
 * NOXGLE - The Architectural Integrity System
 * Design System CSS
 * Mobile-first, semantic HTML5
 */

/* ================================
   CSS Custom Properties (Design Tokens)
   ================================ */
:root {
    /* Primary Palette - Server-Room Cool */
    --color-primary: #004471;
    --color-primary-light: #005c97;
    --color-primary-container: #3a74b2;
    --color-on-primary: #ffffff;
    --color-on-primary-fixed: #ffffff;
    --color-on-primary-fixed-variant: #1a375c;
    --color-primary-fixed-dim: #a8c8e8;
    --color-primary-fixed: #c0d4e3;

    /* Secondary Palette */
    --color-secondary: #006874;
    --color-secondary-container: #a9c7e8;
    --color-on-secondary: #ffffff;
    --color-on-secondary-fixed: #2a375c;
    --color-on-secondary-container: #1a375c;
    --color-secondary-fixed: #2a528c;
    --color-secondary-fixed-dim: #82d3e0;

    /* Tertiary Palette */
    --color-tertiary: #49596c;
    --color-tertiary-container: #60728a;
    --color-on-tertiary: #ffffff;
    --color-on-tertiary-fixed: #2a375c;
    --color-on-tertiary-fixed-variant: #49596c;
    --color-tertiary-fixed: #2a528c;
    --color-tertiary-fixed-dim: #c0d4e3;

    /* Surface Colors */
    --color-surface: #fbf9f8;
    --color-surface-dim: #dcdfe5;
    --color-surface-container: #f6f8fa;
    --color-surface-container-low: #eef1f5;
    --color-surface-container-lowest: #ffffff;
    --color-surface-container-high: #e6e9ec;
    --color-surface-container-highest: #e0e4eb;
    --color-surface-bright: #ffffff;
    --color-surface-variant: #e0e4eb;

    /* On Surface */
    --color-on-surface: #1b1c1c;
    --color-on-surface-variant: #414750;
    --color-on-background: #ffffff;

    /* Error */
    --color-error: #c94d36;
    --color-error-container: #fdd8d8;
    --color-on-error: #ffffff;
    --color-on-error-container: #93000a;

    /* Inverse (Dark Mode) */
    --color-inverse-surface: #2d3a4a;
    --color-inverse-on-surface: #ebebeb;
    --color-inverse-primary: #c0d4e3;

    /* Outline */
    --color-outline: #a0b0c5;
    --color-outline-variant: #a0b0c5;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.125rem;
    --radius-lg: 0.25rem;
    --radius-xl: 0.5rem;
    --radius-full: 0.75rem;

    /* Typography */
    --font-headline: 'Manrope', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'Space Grotesk', monospace;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(27, 28, 28, 0.04);
    --shadow-md: 0 4px 12px rgba(27, 28, 28, 0.06);
    --shadow-lg: 0 20px 40px rgba(27, 28, 28, 0.06);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease;
    --transition-slow: 300ms ease;
}

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

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

body {
    font-family: var(--font-body);
    background-color: var(--color-surface);
    color: var(--color-on-surface);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-headline);
    font-weight: 700;
    line-height: 1.2;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(2rem, 4vw, 2.5rem);
    letter-spacing: -0.01em;
}

h3 {
    font-size: clamp(1.25rem, 2vw, 1.5rem);
}

p {
    margin-bottom: var(--spacing-md);
}

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

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

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

ul, ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ================================
   Layout Utilities
   ================================ */
.container {
    width: 100%;
    max-width: 80rem;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-3xl) 0;
}

.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.flex {
    display: flex;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

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

/* ================================
   Navigation
   ================================ */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--color-surface);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.navbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    max-width: 80rem;
    margin: 0 auto;
}

.navbar-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.navbar-logo svg {
    height: 2.5rem;
    width: auto;
}

.navbar-brand {
    font-family: var(--font-headline);
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--color-primary);
    letter-spacing: -0.02em;
}

.navbar-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.navbar-links a {
    font-family: var(--font-headline);
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--color-on-surface-variant);
    padding: var(--spacing-xs) 0;
    position: relative;
}

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

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

.navbar-links a.active {
    color: var(--color-primary);
    font-weight: 700;
}

.navbar-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-container));
    color: var(--color-on-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-xl);
    font-weight: 700;
    font-size: 0.9rem;
    transition: transform var(--transition-fast), box-shadow var(--transition-normal);
}

.navbar-cta:hover {
    color: var(--color-on-primary);
    box-shadow: var(--shadow-md);
    transform: scale(0.98);
}

.navbar-cta:active {
    transform: scale(0.95);
}

/* Mobile Menu Toggle */
.navbar-mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--spacing-sm);
    background: none;
    border: none;
    cursor: pointer;
}

.navbar-mobile-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-on-surface);
    transition: transform var(--transition-normal), opacity var(--transition-normal);
}

@media (max-width: 768px) {
    .navbar-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: var(--color-surface);
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    }

    .navbar-links.open {
        display: flex;
    }

    .navbar-mobile-toggle {
        display: flex;
    }

    .navbar-mobile-toggle.open span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .navbar-mobile-toggle.open span:nth-child(2) {
        opacity: 0;
    }

    .navbar-mobile-toggle.open span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
}

/* ================================
   Hero Section
   ================================ */
.hero {
    padding: var(--spacing-3xl) 0;
    min-height: 80vh;
    display: flex;
    align-items: center;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

@media (min-width: 1024px) {
    .hero-grid {
        grid-template-columns: 7fr 5fr;
    }
}

.hero-label {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 0.875rem;
    color: var(--color-secondary);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: var(--spacing-md);
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.hero-title .highlight {
    color: var(--color-secondary);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-on-surface-variant);
    line-height: 1.7;
    margin-bottom: var(--spacing-xl);
    max-width: 40rem;
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-xl);
    font-weight: 700;
    font-size: 1rem;
    transition: all var(--transition-normal);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-container));
    color: var(--color-on-primary);
}

.btn-primary:hover {
    color: var(--color-on-primary);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: var(--color-surface-container-highest);
    color: var(--color-on-surface);
}

.btn-secondary:hover {
    background-color: var(--color-surface-container-high);
    color: var(--color-on-surface);
}

.hero-image-wrapper {
    position: relative;
    display: none;
}

@media (min-width: 768px) {
    .hero-image-wrapper {
        display: block;
    }
}

.hero-image {
    position: relative;
    z-index: 10;
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
    border-radius: 50%;
    overflow: hidden;
    border: 12px solid var(--color-surface-container-low);
    box-shadow: var(--shadow-lg);
}

.hero-image img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
}

.hero-badge {
    position: absolute;
    bottom: -1.5rem;
    right: -1.5rem;
    background-color: var(--color-secondary-container);
    color: var(--color-on-secondary-container);
    padding: var(--spacing-md);
    border-radius: var(--radius-xl);
    z-index: 20;
    box-shadow: var(--shadow-md);
}

.hero-badge-value {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
}

.hero-badge-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero-decoration {
    position: absolute;
    top: -2.5rem;
    left: -2.5rem;
    width: 16rem;
    height: 16rem;
    background-color: rgba(var(--color-primary-fixed-dim), 0.2);
    border-radius: 50%;
    filter: blur(3rem);
    z-index: 0;
}

/* ================================
   Skills Section (Bento Grid)
   ================================ */
.skills {
    background-color: var(--color-surface-container-low);
    padding: var(--spacing-3xl) 0;
}

.skills-header {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-xl);
    gap: var(--spacing-md);
}

@media (min-width: 768px) {
    .skills-header {
        flex-direction: row;
        align-items: flex-end;
    }
}

.skills-header h2 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.skills-header p {
    color: var(--color-on-surface-variant);
    max-width: 30rem;
}

.skills-tag {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 0.875rem;
    color: var(--color-primary);
    background-color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 9999px;
    box-shadow: var(--shadow-sm);
}

.skills-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

@media (min-width: 768px) {
    .skills-grid {
        grid-template-columns: repeat(4, 1fr);
        grid-template-rows: repeat(2, auto);
    }
}

.skill-card {
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: box-shadow var(--transition-normal);
}

.skill-card:hover {
    box-shadow: var(--shadow-md);
}

.skill-card-icon {
    width: 3rem;
    height: 3rem;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.skill-card-icon.primary-bg {
    background-color: var(--color-primary-fixed);
    color: var(--color-primary);
}

.skill-card-icon.white-bg {
    background-color: rgba(255, 255, 255, 0.2);
    color: white;
}

.skill-card h3 {
    margin-bottom: var(--spacing-sm);
}

.skill-card p {
    font-size: 0.95rem;
    margin-bottom: var(--spacing-md);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.skill-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 9999px;
    background-color: var(--color-secondary-container);
    color: var(--color-on-secondary-container);
}

/* Bento Grid Spans */
.skill-card.col-span-2 {
    grid-column: span 1;
}

@media (min-width: 768px) {
    .skill-card.col-span-2 {
        grid-column: span 2;
    }
}

/* Card Variations */
.skill-card-white {
    background-color: var(--color-surface-container-lowest);
}

.skill-card-blue {
    background-color: var(--color-secondary);
    color: white;
}

.skill-card-dark {
    background-color: #303030;
    color: white;
}

.skill-card-light {
    background-color: white;
    box-shadow: var(--shadow-sm);
}

.skill-card-dark .skill-card-icon {
    background-color: rgba(255, 255, 255, 0.2);
}

/* Terminal Card */
.terminal-card {
    background-color: #303030;
    border-radius: var(--radius-xl);
    overflow: hidden;
    position: relative;
}

.terminal-header {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: rgba(255, 255, 255, 0.05);
}

.terminal-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.3);
}

.terminal-dot.red { background-color: rgba(255, 77, 77, 0.5); }
.terminal-dot.yellow { background-color: rgba(255, 207, 80, 0.5); }
.terminal-dot.green { background-color: rgba(80, 255, 136, 0.5); }

.terminal-content {
    padding: var(--spacing-md);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-primary-fixed);
    line-height: 1.6;
}

.terminal-content .prompt {
    color: var(--color-secondary-fixed);
}

.terminal-content .success {
    color: #50c878;
}

.terminal-bg-icon {
    position: absolute;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    font-size: 5rem;
    opacity: 0.1;
    color: white;
}

/* ================================
   Experience Section
   ================================ */
.experience {
    padding: var(--spacing-3xl) 0;
}

.experience-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
}

@media (min-width: 1024px) {
    .experience-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-3xl);
    }
}

.experience h2 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-xl);
}

.experience-item {
    display: flex;
    gap: var(--spacing-md);
}

.experience-number {
    flex-shrink: 0;
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    background-color: var(--color-primary-fixed);
    color: var(--color-primary);
    font-family: var(--font-mono);
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
}

.experience-content h4 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.experience-content p {
    color: var(--color-on-surface-variant);
}

.experience-quote {
    background-color: var(--color-surface-container-low);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.experience-quote-icon {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    font-size: 4rem;
    opacity: 0.1;
    color: var(--color-primary);
}

.experience-quote h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

.experience-quote p {
    font-style: italic;
    margin-bottom: var(--spacing-lg);
}

.experience-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.experience-author-line {
    width: 2.5rem;
    height: 2px;
    background-color: var(--color-primary);
}

.experience-author-name {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary);
}

/* ================================
   Contact Section
   ================================ */
.contact {
    background-color: var(--color-primary);
    color: white;
    padding: var(--spacing-3xl) 0;
    position: relative;
    overflow: hidden;
}

.contact-gradient {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at top right, rgba(58, 116, 178, 0.4), transparent 70%);
    pointer-events: none;
}

.contact-inner {
    position: relative;
    z-index: 10;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
}

@media (min-width: 1024px) {
    .contact-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-2xl);
    }
}

.contact h2 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.contact h2 .highlight {
    color: var(--color-secondary-fixed);
}

.contact p {
    color: var(--color-primary-fixed);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
    max-width: 30rem;
}

.contact-item {
    margin-bottom: var(--spacing-xl);
}

.contact-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary-fixed);
    margin-bottom: var(--spacing-xs);
}

.contact-link {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    transition: color var(--transition-normal);
}

.contact-link:hover {
    color: var(--color-secondary-fixed);
}

.contact-card {
    background-color: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.contact-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
}

.contact-card-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.contact-card-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: background-color var(--transition-normal);
}

.contact-card-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
}

.contact-card-link-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.contact-card-icon {
    font-size: 1.75rem;
}

.contact-card-title {
    font-weight: 700;
    font-size: 1.125rem;
}

.contact-card-subtitle {
    font-size: 0.875rem;
    color: var(--color-primary-fixed);
}

/* ================================
   Material Symbols
   ================================ */
.material-symbols-outlined {
    font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
    font-family: 'Material Symbols Outlined';
    font-size: 24px;
    line-height: 1;
    letter-spacing: normal;
    text-transform: none;
    display: inline-block;
    white-space: nowrap;
    word-wrap: normal;
    direction: ltr;
    -webkit-font-feature-settings: 'liga';
    -webkit-font-smoothing: antialiased;
}

/* ================================
   Footer
   ================================ */
.footer {
    background-color: var(--color-surface-container-low);
    padding: var(--spacing-xl) 0;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
}

.footer-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
}

@media (min-width: 768px) {
    .footer-inner {
        flex-direction: row;
    }
}

.footer-brand {
    font-family: var(--font-headline);
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-on-surface-variant);
}

.footer-copyright {
    font-family: var(--font-body);
    font-size: 0.875rem;
    color: var(--color-on-surface-variant);
    opacity: 0.8;
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-links a {
    font-family: var(--font-body);
    font-size: 0.875rem;
    color: var(--color-on-surface-variant);
    opacity: 0.8;
}

.footer-links a:hover {
    opacity: 1;
    color: var(--color-primary);
}

/* ================================
   Utilities
   ================================ */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.mono {
    font-family: var(--font-mono);
}

/* ================================
   Responsive Adjustments
   ================================ */
@media (max-width: 640px) {
    .container {
        padding: 0 var(--spacing-md);
    }

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

    .hero {
        padding: var(--spacing-2xl) 0;
        min-height: auto;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

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

    .skill-card.col-span-2 {
        grid-column: span 1;
    }
}