/* ===========================
   Web Fonts
   =========================== */
@font-face {
    font-family: 'Alliance No.2';
    src: url('../assets/fonts/AllianceNo2-Regular.woff2') format('woff2'),
         url('../assets/fonts/AllianceNo2-Regular.otf') format('opentype');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

/* ===========================
   CSS Custom Properties
   =========================== */
:root {
    /* Colour Palette - Dark Monochrome */
    --colour-bg-primary: #0a0a0a;
    --colour-bg-secondary: #121212;
    --colour-bg-tertiary: #1a1a1a;
    --colour-text-primary: #e5e5e5;
    --colour-text-secondary: #a0a0a0;
    --colour-text-tertiary: #707070;
    /* --colour-accent: #00d9ff; */
    /* --colour-accent-dim: #008fa8; */
    --colour-accent: #ff7700;
    --colour-accent-dim: #a54d00;
    --colour-border: #2a2a2a;
    --colour-border-focus: #3a3a3a;

    /* Typography */
    --font-family-primary: 'Alliance No.2', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    --font-family-mono: 'Alliance No.2', 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', 'Consolas', monospace;

    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 2.5rem;
    --font-size-4xl: 3rem;

    --font-weight-normal: 400;
    --font-weight-medium: 400;
    --font-weight-semibold: 400;
    --font-weight-bold: 400;

    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;

    /* Layout */
    --container-max-width: 1200px;
    --container-padding: var(--space-md);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Effects */
    --border-radius-sm: 2px;
    --border-radius-md: 4px;
    --border-radius-lg: 8px;
}

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

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

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}

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

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

h1 {
    font-size: var(--font-size-4xl);
}

h2 {
    font-size: var(--font-size-2xl);
}

h3 {
    font-size: var(--font-size-xl);
}

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

p:last-child {
    margin-bottom: 0;
}

a {
    color: var(--colour-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

a:focus-visible {
    outline: 2px solid var(--colour-accent);
    outline-offset: 2px;
}

ul {
    list-style: none;
}

/* ===========================
   Layout - Container
   =========================== */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: var(--space-2xl) var(--container-padding);
}

/* ===========================
   Hero Section
   =========================== */
.hero {
    min-height: 100vh;
    min-height: 100dvh; /* Dynamic viewport height - iOS safe */
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    text-align: center;
    padding: var(--space-3xl) 0;
    position: relative;
}

.hero-spacer {
    flex: 1;
    min-height: 0;
}

.hero-content {
    opacity: 0;
    animation: fadeInUp var(--transition-slow) forwards;
    animation-delay: 200ms;
    flex-shrink: 0;
}

@media (prefers-reduced-motion: reduce) {
    .hero-content {
        opacity: 1;
        animation: none;
    }
}

.avatar-wrapper {
    margin-bottom: var(--space-lg);
}

.avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 2px solid var(--colour-border);
    object-fit: cover;
    transition: border-color var(--transition-base);
}

.avatar:hover {
    border-color: var(--colour-accent);
}

.name {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-sm);
    letter-spacing: -0.02em;
}

.title {
    font-size: var(--font-size-xl);
    color: var(--colour-text-secondary);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--space-sm);
}

.tagline {
    font-size: var(--font-size-lg);
    color: var(--colour-text-tertiary);
    max-width: 600px;
    margin: 0 auto;
}

.hero-contact {
    margin-top: var(--space-lg);
    font-size: var(--font-size-sm);
    text-align: right;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-contact a {
    color: var(--colour-text-tertiary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.hero-contact a:hover {
    color: var(--colour-accent);
}

.hero-contact .separator {
    color: var(--colour-text-tertiary);
    margin: 0 var(--space-xs);
    opacity: 0.5;
}

.scroll-down {
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-lg);
    opacity: 0.5;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
    flex-shrink: 0;
    align-self: center;
}

.scroll-down:hover {
    opacity: 1;
    transform: translateY(4px);
}

.scroll-down:focus-visible {
    outline: 2px solid var(--colour-accent);
    outline-offset: 4px;
    opacity: 1;
}

.arrow-icon {
    display: block;
    font-size: var(--font-size-2xl);
    color: var(--colour-text-tertiary);
    line-height: 1;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-8px);
    }
    60% {
        transform: translateY(-4px);
    }
}

@media (prefers-reduced-motion: reduce) {
    .arrow-icon {
        animation: none;
    }

    .scroll-down:hover {
        transform: translateX(-50%);
    }
}

/* ===========================
   Section Styles
   =========================== */
.section {
    padding: var(--space-3xl) 0;
}

.section-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-xl);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--colour-text-primary);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 2px;
    background-color: var(--colour-accent);
    margin-top: var(--space-sm);
}

.section-content {
    max-width: 800px;
}

/* ===========================
   About Section
   =========================== */
.about .section-content p {
    font-size: var(--font-size-lg);
    color: var(--colour-text-secondary);
    line-height: var(--line-height-relaxed);
}

/* ===========================
   Experience - Thematic Pillars
   =========================== */
.experience-pillars {
    display: flex;
    flex-direction: column;
    gap: var(--space-2xl);
}

.pillar-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--colour-text-primary);
    margin-bottom: var(--space-md);
}

.pillar-description {
    font-size: var(--font-size-base);
    color: var(--colour-text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-lg);
}

.pillar-roles {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.pillar-roles li {
    font-size: var(--font-size-base);
    color: var(--colour-text-secondary);
    padding-left: var(--space-md);
    position: relative;
}

.pillar-roles li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--colour-accent);
}

.pillar-roles strong {
    color: var(--colour-text-primary);
    font-weight: var(--font-weight-semibold);
}

.pillar-separator {
    border: none;
    height: 1px;
    background-color: var(--colour-border);
    margin: 0;
}

/* ===========================
   Skills Grid
   =========================== */
.skill-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-xl);
}

.skill-category h3 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-md);
    color: var(--colour-text-primary);
}

.skill-category ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.skill-category li {
    font-size: var(--font-size-base);
    color: var(--colour-text-secondary);
    padding-left: var(--space-md);
    position: relative;
}

.skill-category li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--colour-accent);
}

/* ===========================
   Projects Grid
   =========================== */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-xl);
}

.project-card {
    background-color: var(--colour-bg-secondary);
    border: 1px solid var(--colour-border);
    border-radius: var(--border-radius-md);
    padding: var(--space-lg);
    transition: border-color var(--transition-base), transform var(--transition-base);
}

.project-card:hover {
    border-color: var(--colour-border-focus);
    transform: translateY(-2px);
}

@media (prefers-reduced-motion: reduce) {
    .project-card:hover {
        transform: none;
    }
}

.project-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-md);
    color: var(--colour-text-primary);
}

.project-description {
    font-size: var(--font-size-base);
    color: var(--colour-text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-md);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.tag {
    display: inline-block;
    font-size: var(--font-size-xs);
    font-family: var(--font-family-mono);
    color: var(--colour-text-tertiary);
    background-color: var(--colour-bg-tertiary);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--colour-border);
}

/* ===========================
   Contact Section
   =========================== */
.contact-intro {
    font-size: var(--font-size-lg);
    color: var(--colour-text-secondary);
    margin-bottom: var(--space-xl);
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.contact-link {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-size: var(--font-size-lg);
    color: var(--colour-text-secondary);
    padding: var(--space-md);
    background-color: var(--colour-bg-secondary);
    border: 1px solid var(--colour-border);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-base);
}

.contact-link:hover {
    border-color: var(--colour-accent);
    background-color: var(--colour-bg-tertiary);
    color: var(--colour-accent);
}

.link-icon {
    font-size: var(--font-size-2xl);
    line-height: 1;
}

/* ===========================
   Footer
   =========================== */
.footer {
    margin-top: var(--space-3xl);
    padding: var(--space-xl) 0;
    border-top: 1px solid var(--colour-border);
    text-align: center;
}

.footer p {
    font-size: var(--font-size-sm);
    color: var(--colour-text-tertiary);
    margin-bottom: var(--space-sm);
}

.footer-note {
    font-family: var(--font-family-mono);
    font-size: var(--font-size-xs);
}

/* ===========================
   Animations
   =========================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===========================
   Responsive Design - Mobile First
   =========================== */

/* Mobile: Stack contact links on very small screens */
@media (max-width: 575px) {
    .hero-contact {
        display: flex;
        flex-direction: column;
        align-items: flex-end;
        gap: var(--space-xs);
    }

    .hero-contact .separator {
        display: none;
    }

    .hero-spacer {
        flex: 0.3 !important;
    }

    .hero {
        padding: var(--space-lg) 0 !important;
    }
}

/* Small devices (landscape phones, 576px and up) */
@media (min-width: 576px) {
    :root {
        --container-padding: var(--space-lg);
    }
}

/* Medium devices (tablets, 768px and up) */
@media (min-width: 768px) {
    :root {
        --font-size-4xl: 3.5rem;
        --space-3xl: 8rem;
    }

    .container {
        padding: var(--space-3xl) var(--space-xl);
    }
}

/* Large devices (desktops, 1024px and up) */
@media (min-width: 1024px) {
    :root {
        --font-size-4xl: 4rem;
    }

    .skill-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Extra large devices (large desktops, 1440px and up) */
@media (min-width: 1440px) {
    :root {
        --font-size-4xl: 4.5rem;
    }
}

/* ===========================
   Print Styles
   =========================== */
@media print {
    body {
        background-color: white;
        color: black;
    }

    .hero {
        min-height: auto;
        page-break-after: avoid;
    }

    .section {
        page-break-inside: avoid;
    }

    a {
        color: black;
        text-decoration: underline;
    }

    .contact-link {
        background-color: transparent;
        border: 1px solid black;
    }
}

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

/* Focus visible for keyboard navigation */
:focus-visible {
    outline: 2px solid var(--colour-accent);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --colour-text-primary: #ffffff;
        --colour-text-secondary: #d0d0d0;
        --colour-bg-primary: #000000;
        --colour-border: #ffffff;
    }
}