/* ═══════════════════════════════════════════════════════════════
   Portfolio — Talvin Ackbaraly
   Design System & Styles
   ═══════════════════════════════════════════════════════════════ */

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

/* ─── Custom Properties ─── */
:root {
  /* Typography */
  --font-heading: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;

  /* Spacing scale (8px base) */
  --space-xs: 0.25rem;   /* 4px */
  --space-sm: 0.5rem;    /* 8px */
  --space-md: 1rem;      /* 16px */
  --space-lg: 1.5rem;    /* 24px */
  --space-xl: 2rem;      /* 32px */
  --space-2xl: 3rem;     /* 48px */
  --space-3xl: 4rem;     /* 64px */
  --space-4xl: 6rem;     /* 96px */
  --space-5xl: 8rem;     /* 128px */

  /* Layout */
  --max-width: 64rem;    /* 1024px */
  --nav-height: 4rem;

  /* Borders */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;
}

/* ─── Light theme (default) ─── */
:root,
[data-theme="light"] {
  --color-bg: #fafaf9;
  --color-bg-alt: #f0efed;
  --color-surface: #ffffff;
  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-tertiary: #94a3b8;
  --color-border: #e2e8f0;
  --color-border-subtle: #f1f5f9;
  --color-accent: #0284c7;
  --color-accent-hover: #0369a1;
  --color-accent-subtle: rgba(2, 132, 199, 0.08);
  --color-nav-bg: rgba(250, 250, 249, 0.85);
  --color-tag-bg: #f1f5f9;
  --color-tag-text: #334155;
  --color-mobile-menu-bg: rgba(250, 250, 249, 0.97);
}

/* ─── Dark theme ─── */
[data-theme="dark"] {
  --color-bg: #090d16;
  --color-bg-alt: #131b2e;
  --color-surface: #131b2e;
  --color-text: #f8fafc;
  --color-text-secondary: #94a3b8;
  --color-text-tertiary: #64748b;
  --color-border: #1e293b;
  --color-border-subtle: #0f172a;
  --color-accent: #38bdf8;
  --color-accent-hover: #7dd3fc;
  --color-accent-subtle: rgba(56, 189, 248, 0.12);
  --color-nav-bg: rgba(9, 13, 22, 0.85);
  --color-tag-bg: #1e293b;
  --color-tag-text: #cbd5e1;
  --color-mobile-menu-bg: rgba(9, 13, 22, 0.97);
}

/* ─── Base ─── */
html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + var(--space-lg));
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition:
    background-color var(--duration-slow) var(--ease-out),
    color var(--duration-slow) var(--ease-out);
}

/* ─── Focus ─── */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ─── Container ─── */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-lg);
}

/* ─── Links base ─── */
a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--duration-normal) var(--ease-out);
}
a:hover {
  color: var(--color-accent-hover);
}

/* ═══════════════════════════════════════════════════════════════
   Navigation
   ═══════════════════════════════════════════════════════════════ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background-color: var(--color-nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition:
    background-color var(--duration-slow) var(--ease-out),
    border-color var(--duration-slow) var(--ease-out);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav__logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
  letter-spacing: -0.02em;
  transition: color var(--duration-normal) var(--ease-out);
}
.nav__logo:hover {
  color: var(--color-accent);
}

.nav__links {
  display: flex;
  gap: var(--space-xl);
  list-style: none;
}

.nav__links a {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  letter-spacing: 0.01em;
  position: relative;
  padding-block: var(--space-xs);
  transition: color var(--duration-normal) var(--ease-out);
}
.nav__links a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1.5px;
  background-color: var(--color-accent);
  transition: width var(--duration-normal) var(--ease-out);
}
.nav__links a:hover {
  color: var(--color-text);
}
.nav__links a:hover::after {
  width: 100%;
}

/* Theme & Lang Controls */
.nav__controls {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.nav__lang-toggle,
.nav__theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 2.25rem;
  padding-inline: 0.625rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--color-text-secondary);
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition:
    color var(--duration-normal) var(--ease-out),
    border-color var(--duration-normal) var(--ease-out),
    background-color var(--duration-normal) var(--ease-out);
}
.nav__theme-toggle {
  width: 2.25rem;
  padding-inline: 0;
}
.nav__lang-toggle:hover,
.nav__theme-toggle:hover {
  color: var(--color-text);
  border-color: var(--color-text-tertiary);
  background-color: var(--color-accent-subtle);
}

/* Show/hide sun & moon icons */
[data-theme="dark"] .icon-moon,
:root:not([data-theme="dark"]) .icon-sun {
  display: none;
}
[data-theme="dark"] .icon-sun,
:root:not([data-theme="dark"]) .icon-moon {
  display: block;
}

/* Burger */
.nav__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.25rem;
  height: 2.25rem;
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 0.375rem;
}
.nav__burger span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 1px;
  transition:
    transform var(--duration-normal) var(--ease-out),
    opacity var(--duration-fast);
}
.nav__burger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav__burger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav__burger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu overlay */
.mobile-menu {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 99;
  background-color: var(--color-mobile-menu-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: var(--space-4xl);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--duration-normal) var(--ease-out),
    visibility var(--duration-normal);
}
.mobile-menu[aria-hidden="false"] {
  opacity: 1;
  visibility: visible;
}

.mobile-menu__links {
  list-style: none;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}
.mobile-menu__links a {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-text);
  transition: color var(--duration-normal) var(--ease-out);
}
.mobile-menu__links a:hover {
  color: var(--color-accent);
}

/* ═══════════════════════════════════════════════════════════════
   Sections — Shared
   ═══════════════════════════════════════════════════════════════ */
.section {
  padding-block: var(--space-4xl);
}

.section--alt {
  background-color: var(--color-bg-alt);
  transition: background-color var(--duration-slow) var(--ease-out);
}

.section__title {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-text);
  line-height: 1.2;
}

.section__divider {
  width: 2.5rem;
  height: 2.5px;
  background-color: var(--color-accent);
  margin-top: var(--space-md);
  margin-bottom: var(--space-2xl);
  border-radius: 2px;
}

/* ═══════════════════════════════════════════════════════════════
   Hero
   ═══════════════════════════════════════════════════════════════ */
.hero {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  padding-bottom: var(--space-4xl);
  position: relative;
}

.hero__inner {
  padding-block: var(--space-4xl);
}

.hero__greeting {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
  letter-spacing: 0.02em;
}

.hero__name {
  font-family: var(--font-heading);
  font-size: clamp(2.25rem, 7vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.1;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
}

.hero__headline {
  font-family: var(--font-body);
  font-size: clamp(1.05rem, 2.5vw, 1.25rem);
  color: var(--color-text-secondary);
  line-height: 1.6;
  max-width: 38rem;
  margin-bottom: var(--space-md);
}

.hero__status {
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-2xl);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}
.hero__status::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-accent);
  flex-shrink: 0;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  align-items: center;
}

.hero__scroll-indicator {
  position: absolute;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

.hero__scroll-indicator a {
  color: var(--color-text-tertiary);
  transition: color var(--duration-normal) var(--ease-out);
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero__scroll-indicator a:hover {
  color: var(--color-accent);
}

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

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1.5px solid transparent;
  cursor: pointer;
  transition:
    background-color var(--duration-normal) var(--ease-out),
    color var(--duration-normal) var(--ease-out),
    border-color var(--duration-normal) var(--ease-out),
    transform var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-normal) var(--ease-out);
  text-decoration: none;
  line-height: 1.4;
}
.btn:active {
  transform: scale(0.97);
}

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

.btn--outline {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn--outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background-color: var(--color-accent-subtle);
}

.btn__icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* ═══════════════════════════════════════════════════════════════
   About
   ═══════════════════════════════════════════════════════════════ */
.about__intro {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  max-width: 48rem;
  margin-bottom: var(--space-2xl);
  line-height: 1.8;
}

.about__education {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.edu-item {
  padding-left: var(--space-lg);
  border-left: 2px solid var(--color-border);
  transition: border-color var(--duration-normal) var(--ease-out);
}
.edu-item:hover {
  border-left-color: var(--color-accent);
}

.edu-item__header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-sm) var(--space-md);
  margin-bottom: var(--space-xs);
}

.edu-item__institution {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
}

.edu-item__location {
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
}

.edu-item__degree {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
}

.edu-item__period {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-tertiary);
  letter-spacing: 0.02em;
}

.edu-item__description {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-top: var(--space-xs);
  line-height: 1.5;
}

.about__certifications {
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.about__certifications p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

.cert-label {
  font-weight: 500;
  color: var(--color-text);
}

/* ═══════════════════════════════════════════════════════════════
   Experience
   ═══════════════════════════════════════════════════════════════ */
.experience__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
}

.exp-item {
  display: grid;
  grid-template-columns: 11rem 1fr;
  gap: var(--space-lg);
  align-items: start;
}

.exp-item__meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.exp-item__period {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-tertiary);
  letter-spacing: 0.02em;
}

.exp-item__type {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
}

.exp-item__content {
  padding-left: var(--space-lg);
  border-left: 2px solid var(--color-border);
  transition: border-color var(--duration-normal) var(--ease-out);
}
.exp-item__content:hover {
  border-left-color: var(--color-accent);
}

.exp-item__title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.125rem;
}

.exp-item__company {
  font-size: 0.9rem;
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: var(--space-sm);
}

.exp-item__description {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.exp-item__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

/* ─── Tags (shared) ─── */
.tag {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-sm);
  background-color: var(--color-tag-bg);
  color: var(--color-tag-text);
  letter-spacing: 0.01em;
  transition:
    background-color var(--duration-normal) var(--ease-out),
    color var(--duration-normal) var(--ease-out);
}

/* ═══════════════════════════════════════════════════════════════
   Projects
   ═══════════════════════════════════════════════════════════════ */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 22rem), 1fr));
  gap: var(--space-lg);
}

.project-card {
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface);
  cursor: default;
  transition:
    border-color var(--duration-normal) var(--ease-out),
    background-color var(--duration-slow) var(--ease-out),
    transform var(--duration-normal) var(--ease-out);
}
.project-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  cursor: default;
}

.project-card__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-sm);
  margin-bottom: var(--space-xs);
}

.project-card__name {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.project-card__period {
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  white-space: nowrap;
}

.project-card__title {
  font-size: 0.85rem;
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: var(--space-sm);
}

.project-card__description {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin-bottom: var(--space-sm);
}

.project-card__highlights {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-md) 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.35s ease, opacity 0.3s ease, margin 0.3s ease;
  margin-bottom: 0;
}

.project-card:hover .project-card__highlights {
  max-height: 200px;
  opacity: 1;
  margin-bottom: var(--space-md);
}

.project-card__highlights li {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  padding-left: 1em;
  position: relative;
  line-height: 1.5;
}

.project-card__highlights li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-size: 0.7rem;
  top: 0.15em;
}

.project-card__footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm);
}

.project-card__team {
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  margin-left: auto;
}

.project-card__link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-accent);
  margin-left: auto;
  transition: color var(--duration-normal) var(--ease-out);
}
.project-card__link:hover {
  color: var(--color-accent-hover);
}

/* ═══════════════════════════════════════════════════════════════
   Skills
   ═══════════════════════════════════════════════════════════════ */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr));
  gap: var(--space-xl);
}

.skill-group {
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface);
  transition:
    background-color var(--duration-slow) var(--ease-out),
    border-color var(--duration-normal) var(--ease-out);
}
.skill-group:hover {
  border-color: var(--color-accent);
}

.skill-group__title {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-md);
  letter-spacing: -0.01em;
}

.skill-group__items {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

/* ═══════════════════════════════════════════════════════════════
   Contact
   ═══════════════════════════════════════════════════════════════ */
.contact__inner {
  text-align: center;
  max-width: 36rem;
  margin-inline: auto;
}

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

.contact__inner .section__divider {
  margin-inline: auto;
}

.contact__text {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2xl);
  line-height: 1.8;
}

.contact__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md);
}

/* ═══════════════════════════════════════════════════════════════
   Footer
   ═══════════════════════════════════════════════════════════════ */
.footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-2xl);
  transition:
    background-color var(--duration-slow) var(--ease-out),
    border-color var(--duration-slow) var(--ease-out);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}

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

.footer__logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-accent);
}

.footer__name {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
}

.footer__links {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
}

.footer__links a {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  transition: color var(--duration-normal) var(--ease-out);
}
.footer__links a:hover {
  color: var(--color-accent);
}

.footer__copy {
  font-size: 0.8rem;
  color: var(--color-text-tertiary);
}

/* ═══════════════════════════════════════════════════════════════
   Fade-in on scroll
   ═══════════════════════════════════════════════════════════════ */
.fade-in {
  opacity: 0;
  transform: translateY(1rem);
  transition:
    opacity var(--duration-slow) var(--ease-out),
    transform var(--duration-slow) var(--ease-out);
}
.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ═══════════════════════════════════════════════════════════════
   Responsive
   ═══════════════════════════════════════════════════════════════ */

/* ─── Tablet & below (< 768px) ─── */
@media (max-width: 768px) {
  .nav__links {
    display: none;
  }
  .nav__burger {
    display: flex;
  }

  .hero__inner {
    padding-block: var(--space-2xl);
  }

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

  .exp-item {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  .exp-item__content {
    padding-left: var(--space-md);
  }

  .edu-detail {
    flex-direction: column;
    gap: 0.125rem;
  }
  .edu-detail__period {
    min-width: auto;
  }

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

/* ─── Small mobile (< 480px) ─── */
@media (max-width: 480px) {
  .container {
    padding-inline: var(--space-md);
  }

  .hero__name {
    font-size: 2rem;
  }

  .hero__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero__actions .btn {
    justify-content: center;
  }

  .contact__links {
    flex-direction: column;
    align-items: stretch;
  }

  .contact__links .btn {
    justify-content: center;
  }

  .footer__links {
    flex-wrap: wrap;
    justify-content: center;
  }
}