/* ============================================================
   style.css – Brama Portfolio
   Arsitektur: CSS Custom Properties → Theme → Base → Layout → Components → Animations
   ============================================================ */

/* ── 1. CSS CUSTOM PROPERTIES (THEME TOKENS) ─────────────────── */
:root {
  /* Palette – Dark (default) */
  --color-bg:          #0A0A0F;
  --color-surface:     #1A1A2E;
  --color-surface-2:   #252540;
  --color-border:      #2A2A4A;
  --color-accent:      #6C63FF;
  --color-accent-glow: rgba(108, 99, 255, 0.25);
  --color-text:        #F0F0F5;
  --color-text-muted:  #8888AA;
  --color-success:     #4ADE80;
  --color-error:       #F87171;

  /* Typography */
  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body:    'Inter', system-ui, sans-serif;

  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;
  --text-5xl:  3rem;
  --text-6xl:  3.75rem;
  --text-7xl:  4.5rem;

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;

  /* Layout */
  --container-max: 1100px;
  --container-pad: var(--space-6);

  /* Borders */
  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  20px;
  --radius-pill: 9999px;

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 150ms;
  --duration-base: 300ms;
  --duration-slow: 500ms;

  /* Shadows */
  --shadow-card: 0 1px 3px rgba(0,0,0,0.4), 0 8px 24px rgba(0,0,0,0.3);
  --shadow-accent: 0 0 24px var(--color-accent-glow);
}

/* Light Theme Override */
[data-theme="light"] {
  --color-bg:          #F5F5FF;
  --color-surface:     #FFFFFF;
  --color-surface-2:   #EEEEF8;
  --color-border:      #DDDDF0;
  --color-accent:      #5046E5;
  --color-accent-glow: rgba(80, 70, 229, 0.15);
  --color-text:        #111120;
  --color-text-muted:  #55556A;
  --shadow-card: 0 1px 3px rgba(0,0,0,0.08), 0 8px 24px rgba(0,0,0,0.06);
}

/* ── 2. RESET & BASE ──────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--duration-base) var(--ease-out),
              color var(--duration-base) var(--ease-out);
  overflow-x: hidden;
}

img, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul { list-style: none; }

/* ── 3. LAYOUT UTILITIES ──────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.section {
  padding-block: var(--space-24);
}

/* ── 4. TYPOGRAPHY ────────────────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.section__title {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-12);
  position: relative;
  display: inline-block;
}

.section__title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 40px;
  height: 3px;
  background: var(--color-accent);
  border-radius: var(--radius-pill);
  transition: width var(--duration-slow) var(--ease-out);
}

.section__title.is-visible::after {
  width: 100%;
}

/* ── 5. HEADER / NAV ──────────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding-block: var(--space-4);
  transition: background-color var(--duration-base) var(--ease-out),
              box-shadow var(--duration-base) var(--ease-out),
              padding var(--duration-base) var(--ease-out);
}

.site-header.scrolled {
  background-color: var(--color-bg);
  box-shadow: 0 1px 0 var(--color-border);
  padding-block: var(--space-3);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}

.nav__logo {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.03em;
}

.nav__logo-cursor {
  color: var(--color-accent);
  animation: blink 1s step-end infinite;
}

.nav__links {
  display: flex;
  gap: var(--space-8);
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--duration-fast);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--duration-base) var(--ease-out);
}

.nav__link:hover,
.nav__link.active {
  color: var(--color-text);
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-pill);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-lg);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  transition: background-color var(--duration-fast), color var(--duration-fast);
}

.theme-toggle:hover {
  background-color: var(--color-surface);
  color: var(--color-text);
}

.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
}

.nav__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--duration-base) var(--ease-out), opacity var(--duration-base);
}

.nav__hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__hamburger.open span:nth-child(2) { opacity: 0; }
.nav__hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── 6. HERO ──────────────────────────────────────────────────── */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.hero__inner {
  position: relative;
  z-index: 2;
}

.hero__eyebrow {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
  animation-delay: 0.1s;
}

.hero__name {
  font-size: clamp(var(--text-5xl), 10vw, var(--text-7xl));
  color: var(--color-text);
  margin-bottom: var(--space-4);
  animation-delay: 0.2s;
}

.hero__dot {
  color: var(--color-accent);
}

.hero__tagline {
  font-family: var(--font-display);
  font-size: clamp(var(--text-xl), 3vw, var(--text-3xl));
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
  min-height: 2em;
  animation-delay: 0.3s;
}

.typing-cursor {
  color: var(--color-accent);
  animation: blink 0.8s step-end infinite;
  font-weight: 300;
}

.hero__bio {
  max-width: 540px;
  color: var(--color-text-muted);
  font-size: var(--text-lg);
  margin-bottom: var(--space-8);
  animation-delay: 0.4s;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  animation-delay: 0.5s;
}

/* Background grid decoration */
.hero__bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--color-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.25;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 0%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 0%, transparent 100%);
}

/* ── 7. BUTTONS ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.6em 1.4em;
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: transform var(--duration-fast) var(--ease-spring),
              box-shadow var(--duration-fast),
              background-color var(--duration-fast),
              color var(--duration-fast);
  white-space: nowrap;
}

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

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-accent);
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.btn--ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

.btn--sm {
  padding: 0.4em 1em;
  font-size: var(--text-xs);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

.btn--sm:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

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

/* ── 8. ABOUT ─────────────────────────────────────────────────── */
.about {
  background-color: var(--color-surface);
}

.about__layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: start;
}

.about__text p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

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

/* Skills Grid */
.skills__heading {
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.skills__grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.skill-badge {
  padding: 0.35em 0.9em;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  font-size: var(--text-sm);
  font-family: var(--font-display);
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-surface-2);
  transition: transform var(--duration-fast) var(--ease-spring),
              border-color var(--duration-fast),
              color var(--duration-fast),
              box-shadow var(--duration-fast);
  cursor: default;
  opacity: 0;
  transform: translateY(8px);
}

.skill-badge.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.skill-badge:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-3px);
  box-shadow: var(--shadow-accent);
}

/* ── 9. PROJECTS ──────────────────────────────────────────────── */
.filter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
}

.filter-btn {
  padding: 0.4em 1.1em;
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  font-family: var(--font-display);
  font-weight: 500;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  background: transparent;
  transition: all var(--duration-fast);
}

.filter-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

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

.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-6);
}

.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--duration-base) var(--ease-out),
              box-shadow var(--duration-base) var(--ease-out),
              border-color var(--duration-base);
}

.project-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
  border-color: var(--color-accent);
}

.project-card.hidden {
  display: none;
}

.project-card__img-wrap {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--color-surface-2);
}

.project-card__img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-out);
}

.project-card:hover .project-card__img-wrap img {
  transform: scale(1.05);
}

/* Placeholder when PNG is missing */
.project-card__placeholder {
  position: absolute;
  inset: 0;
  align-items: center;
  justify-content: center;
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-family: var(--font-display);
  border-bottom: 1px dashed var(--color-border);
}

.project-card__body {
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  flex: 1;
}

.project-card__title {
  font-size: var(--text-xl);
  color: var(--color-text);
}

.project-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag {
  font-size: var(--text-xs);
  font-family: var(--font-display);
  font-weight: 500;
  padding: 0.2em 0.7em;
  border-radius: var(--radius-pill);
  background: var(--color-accent-glow);
  color: var(--color-accent);
  border: 1px solid transparent;
}

.project-card__links {
  display: flex;
  gap: var(--space-2);
  margin-top: auto;
}

/* ── 10. CREDENTIALS ──────────────────────────────────────────── */
.credentials {
  background-color: var(--color-surface);
}

.credentials__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  max-width: 720px;
}

.credential-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--duration-fast);
}

.credential-item:hover,
.credential-item:focus-within {
  border-color: var(--color-accent);
}

.credential-item__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6);
  background: var(--color-surface);
  text-align: left;
  gap: var(--space-4);
  transition: background-color var(--duration-fast);
}

.credential-item__trigger:hover {
  background: var(--color-surface-2);
}

.credential-item__left {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.credential-item__icon {
  font-size: var(--text-2xl);
  flex-shrink: 0;
}

.credential-item__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-base);
  color: var(--color-text);
}

.credential-item__issuer {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.credential-item__chevron {
  font-size: var(--text-xl);
  color: var(--color-text-muted);
  transition: transform var(--duration-base) var(--ease-out);
  flex-shrink: 0;
}

.credential-item__trigger[aria-expanded="true"] .credential-item__chevron {
  transform: rotate(90deg);
}

.credential-item__detail {
  padding: var(--space-4) var(--space-6);
  padding-left: calc(var(--space-6) + 40px + var(--space-4));
  border-top: 1px solid var(--color-border);
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.credential-item__detail p {
  margin-bottom: var(--space-3);
}

/* ── 11. CONTACT ──────────────────────────────────────────────── */
.contact__layout {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--space-12);
  align-items: start;
}

.contact__info > p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
  font-size: var(--text-lg);
}

.contact__quick-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.quick-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-weight: 500;
  transition: all var(--duration-fast);
}

.quick-link:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateX(4px);
}

.quick-link__icon {
  font-size: var(--text-xl);
}

/* Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.form-label {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
}

.form-input {
  width: 100%;
  padding: 0.7em 1em;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--text-base);
  transition: border-color var(--duration-fast), box-shadow var(--duration-fast);
  outline: none;
}

.form-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.form-input.error {
  border-color: var(--color-error);
}

.form-textarea {
  resize: vertical;
  min-height: 130px;
}

.form-error {
  font-size: var(--text-xs);
  color: var(--color-error);
  min-height: 1em;
}

.form-success {
  text-align: center;
  color: var(--color-success);
  font-weight: 500;
  padding: var(--space-3);
}

/* ── 12. FOOTER ───────────────────────────────────────────────── */
.site-footer {
  padding-block: var(--space-8);
  border-top: 1px solid var(--color-border);
}

.site-footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.back-to-top {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  transition: all var(--duration-fast);
}

.back-to-top:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-3px);
}

/* ── 13. ANIMATIONS ───────────────────────────────────────────── */
@keyframes blink {
  50% { opacity: 0; }
}

/* Fade-in for Hero elements (CSS-driven, one-time) */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  animation: fade-in-up var(--duration-slow) var(--ease-out) forwards;
}

@keyframes fade-in-up {
  to { opacity: 1; transform: translateY(0); }
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── 14. RESPONSIVE ───────────────────────────────────────────── */
@media (max-width: 768px) {
  :root {
    --container-pad: var(--space-4);
  }

  .nav__links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-4) var(--container-pad) var(--space-6);
    gap: var(--space-4);
  }

  .nav__links.open { display: flex; }

  .nav__hamburger { display: flex; }

  .about__layout,
  .contact__layout {
    grid-template-columns: 1fr;
  }

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

  .hero {
    padding-top: 70px;
  }

  .site-header {
    position: fixed;
  }
}

@media (max-width: 480px) {
  .section__title { font-size: var(--text-2xl); }
  .hero__cta { flex-direction: column; }
  .hero__cta .btn { width: 100%; justify-content: center; }
}