/* ==========================================================================
   Mahmoud Mohammed — Portfolio
   1. Design tokens
   2. Base & primitives
   3. Ambient background / cursor / chrome
   4. Sidebar
   5. Hero
   6. About & stats
   7. Skills
   8. Portfolio
   9. Contact & footer
   10. Motion
   11. Responsive
   ========================================================================== */

/* ============================ 1. Design tokens ============================ */

:root {
  /* brand — the original amber, kept as the identity of the site */
  --accent: #e38528;
  --accent-bright: #f6a34a;
  --accent-deep: #c56d18;

  /* type */
  --font-display: "Space Grotesk", "Segoe UI", sans-serif;
  --font-body: "Inter", "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Consolas", monospace;

  /* scale (html is 62.5% → 1rem = 10px) */
  --step--1: 1.3rem;
  --step-0: 1.6rem;
  --step-1: 1.8rem;
  --step-2: clamp(2rem, 1.6vw + 1.4rem, 2.4rem);
  --step-3: clamp(2.4rem, 2.2vw + 1.6rem, 3.2rem);
  --step-4: clamp(3.2rem, 3.4vw + 1.8rem, 4.6rem);
  --step-5: clamp(4rem, 5vw + 2rem, 6.4rem);

  /* rhythm */
  --gap: 1.6rem;
  --gap-lg: 2.4rem;
  --section-y: clamp(8rem, 9vw, 12rem);
  --radius-sm: 0.8rem;
  --radius: 1.4rem;
  --radius-lg: 2.2rem;
  --sidebar-w: 28rem;
  --content-max: 124rem;

  /* motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-soft: cubic-bezier(0.4, 0, 0.2, 1);
  --dur: 0.35s;
}

/* dark (default) */
[data-theme="dark"] {
  --bg: #0d0c0b;
  --bg-alt: #121110;
  --surface: rgba(255, 255, 255, 0.035);
  --surface-solid: #171512;
  --surface-hover: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text: #f4f0ea;
  --text-2: #a49c92;
  --text-3: #6f675f;
  --accent-soft: rgba(227, 133, 40, 0.14);
  --accent-glow: rgba(227, 133, 40, 0.28);
  --shadow: 0 2.4rem 5rem -1.2rem rgba(0, 0, 0, 0.65);
  --shadow-sm: 0 0.8rem 2rem -0.8rem rgba(0, 0, 0, 0.5);
  --grid-line: rgba(255, 255, 255, 0.028);
  --ok: #4ade80;
  color-scheme: dark;
}

/* light — the original cream palette, refined */
[data-theme="light"] {
  --bg: #faf6f0;
  --bg-alt: #ffffff;
  --surface: #ffffff;
  --surface-solid: #ffffff;
  --surface-hover: #fffdfa;
  --border: rgba(20, 15, 10, 0.09);
  --border-strong: rgba(20, 15, 10, 0.18);
  --text: #16120e;
  --text-2: #6b6157;
  --text-3: #9a9088;
  --accent-soft: rgba(227, 133, 40, 0.1);
  --accent-glow: rgba(227, 133, 40, 0.22);
  --shadow: 0 2.4rem 5rem -1.6rem rgba(60, 40, 20, 0.18);
  --shadow-sm: 0 0.8rem 2rem -0.8rem rgba(60, 40, 20, 0.12);
  --grid-line: rgba(20, 15, 10, 0.035);
  --ok: #16a34a;
  color-scheme: light;
}

/* ========================== 2. Base & primitives ========================== */

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

html {
  font-size: 62.5%;
  scroll-behavior: smooth;
  scroll-padding-top: 4rem;
  overflow-x: hidden;
}

body {
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  padding-left: var(--sidebar-w);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  transition: background var(--dur) var(--ease-soft),
    color var(--dur) var(--ease-soft);
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

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

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection {
  background: var(--accent);
  color: #fff;
}

section {
  position: relative;
  max-width: var(--content-max);
  margin-inline: auto;
  padding: var(--section-y) clamp(2rem, 5vw, 6rem);
}

/* headings ---------------------------------------------------------------- */

.section-head {
  text-align: center;
  margin-bottom: clamp(4rem, 6vw, 6.4rem);
}

.section-head--left {
  text-align: left;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.2rem;
}

.heading {
  font-family: var(--font-display);
  font-size: var(--step-4);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: var(--text);
}

.heading span {
  color: var(--accent);
}

.heading--sm {
  font-size: var(--step-3);
}

.section-sub {
  max-width: 56ch;
  margin: 1.6rem auto 0;
  color: var(--text-2);
  font-size: var(--step-1);
}

.section-head--left .section-sub {
  margin-inline: 0;
}

/* buttons ----------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
  padding: 1.3rem 2.6rem;
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: var(--step-0);
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease), background var(--dur) var(--ease-soft),
    border-color var(--dur) var(--ease-soft), color var(--dur) var(--ease-soft);
}

.btn i {
  font-size: 0.9em;
}

.btn-primary {
  background: linear-gradient(
    135deg,
    var(--accent-bright),
    var(--accent) 55%,
    var(--accent-deep)
  );
  color: #fff;
  box-shadow: 0 1rem 2.4rem -0.8rem var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 1.6rem 3.2rem -0.8rem var(--accent-glow);
}

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

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

.btn-lg {
  padding: 1.6rem 3.2rem;
  font-size: var(--step-1);
}

/* chips ------------------------------------------------------------------- */

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.chips li {
  padding: 0.55rem 1.2rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-2);
  font-size: var(--step--1);
  font-weight: 500;
  white-space: nowrap;
  transition: color var(--dur) var(--ease-soft),
    border-color var(--dur) var(--ease-soft),
    background var(--dur) var(--ease-soft);
}

.chips li:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}

.chips--sm li {
  font-size: 1.15rem;
  padding: 0.4rem 0.9rem;
  font-family: var(--font-mono);
}

/* skip link --------------------------------------------------------------- */

.skip-link {
  position: fixed;
  top: 1rem;
  left: calc(var(--sidebar-w) + 1rem);
  z-index: 20000;
  padding: 1rem 2rem;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  transform: translateY(-200%);
  transition: transform 0.2s var(--ease);
}

.skip-link:focus-visible {
  transform: translateY(0);
}

/* ================= 3. Ambient background / cursor / chrome ================ */

.bg-layer {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}

.bg-grid {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 6rem 6rem;
  mask-image: radial-gradient(ellipse at 50% 0%, #000 0%, transparent 75%);
  -webkit-mask-image: radial-gradient(
    ellipse at 50% 0%,
    #000 0%,
    transparent 75%
  );
}

.bg-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.5;
}

.bg-glow--1 {
  top: -14rem;
  right: -8rem;
  width: 46rem;
  height: 46rem;
  background: radial-gradient(circle, var(--accent-glow), transparent 68%);
}

.bg-glow--2 {
  top: 78rem;
  left: 4rem;
  width: 40rem;
  height: 40rem;
  background: radial-gradient(
    circle,
    rgba(120, 160, 255, 0.16),
    transparent 68%
  );
}

/* custom cursor ----------------------------------------------------------- */

.cursor-dot,
.cursor-ring {
  position: fixed;
  top: 0;
  left: 0;
  pointer-events: none;
  z-index: 10000;
  border-radius: 50%;
  will-change: transform;
  /* stays hidden until the pointer actually moves, so it never sits
     stranded in the middle of the viewport on load */
  opacity: 0;
}

.cursor-dot {
  width: 0.7rem;
  height: 0.7rem;
  background: var(--accent);
  transition: width 0.25s var(--ease), height 0.25s var(--ease),
    opacity 0.25s var(--ease);
}

.cursor-ring {
  width: 3.4rem;
  height: 3.4rem;
  border: 1px solid var(--accent);
  transition: width 0.3s var(--ease), height 0.3s var(--ease),
    opacity 0.3s var(--ease), background 0.3s var(--ease);
}

.cursor-ready .cursor-dot {
  opacity: 1;
}

.cursor-ready .cursor-ring {
  opacity: 0.6;
}

.cursor-ready .cursor-ring.is-active {
  width: 6rem;
  height: 6rem;
  background: var(--accent-soft);
  opacity: 1;
}

.cursor-ready .cursor-dot.is-active {
  opacity: 0;
}

/* scroll progress --------------------------------------------------------- */

.scroll-progress {
  position: fixed;
  top: 0;
  left: var(--sidebar-w);
  right: 0;
  height: 3px;
  z-index: 9000;
  background: transparent;
}

.scroll-progress span {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-bright));
  box-shadow: 0 0 1.2rem var(--accent-glow);
}

/* back to top ------------------------------------------------------------- */

.to-top {
  position: fixed;
  right: 2.4rem;
  bottom: 2.4rem;
  z-index: 8000;
  display: grid;
  place-items: center;
  width: 4.8rem;
  height: 4.8rem;
  border-radius: 50%;
  font-size: 1.6rem;
  color: #fff;
  background: var(--accent);
  box-shadow: 0 1rem 2.4rem -0.6rem var(--accent-glow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(1.4rem);
  transition: all var(--dur) var(--ease);
}

.to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top:hover {
  background: var(--text);
  color: var(--bg);
}

/* ============================== 4. Sidebar =============================== */

#sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 1000;
  width: var(--sidebar-w);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 3rem;
  padding: 3.6rem 2.4rem;
  background: var(--bg-alt);
  border-right: 1px solid var(--border);
  transition: transform 0.45s var(--ease), background var(--dur) var(--ease-soft);
}

/* logo */
.logo {
  display: flex;
  align-items: center;
  gap: 1.2rem;
}

.logo-mark {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 4.4rem;
  height: 4.4rem;
  border-radius: 1.2rem;
  background: linear-gradient(135deg, var(--accent-bright), var(--accent-deep));
  color: #fff;
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  box-shadow: 0 0.8rem 2rem -0.6rem var(--accent-glow);
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  font-family: var(--font-display);
}

.logo-text strong {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text);
}

.logo-text em {
  font-style: normal;
  font-size: 1.8rem;
  font-weight: 500;
  color: var(--accent);
}

.logo-role {
  margin-top: 1.4rem;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-3);
}

/* nav */
.navbar {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 1.4rem;
  padding: 1.2rem 1.4rem;
  border-radius: var(--radius-sm);
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--text-2);
  transition: color var(--dur) var(--ease-soft),
    background var(--dur) var(--ease-soft);
}

.nav-link i {
  width: 1.8rem;
  font-size: 1.4rem;
  text-align: center;
  transition: transform var(--dur) var(--ease);
}

.nav-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 3px;
  height: 0;
  border-radius: 999px;
  background: var(--accent);
  transform: translateY(-50%);
  transition: height var(--dur) var(--ease);
}

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

.nav-link:hover i {
  transform: translateX(2px);
}

.nav-link.is-active {
  color: var(--text);
  background: var(--accent-soft);
}

.nav-link.is-active i {
  color: var(--accent);
}

.nav-link.is-active::before {
  height: 55%;
}

/* sidebar bottom */
.sidebar-bottom {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.theme-toggle {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-around;
  width: 100%;
  height: 4.4rem;
  padding: 0 0.5rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  overflow: hidden;
}

.theme-toggle i {
  position: relative;
  z-index: 2;
  flex: 1;
  font-size: 1.4rem;
  text-align: center;
  transition: color var(--dur) var(--ease-soft);
}

.theme-toggle-thumb {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  width: calc(50% - 0.5rem);
  height: calc(100% - 1rem);
  border-radius: 999px;
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  transition: transform var(--dur) var(--ease);
}

[data-theme="light"] .theme-toggle i:first-child {
  color: var(--accent);
}
[data-theme="light"] .theme-toggle i:last-child {
  color: var(--text-3);
}
[data-theme="dark"] .theme-toggle i:first-child {
  color: var(--text-3);
}
[data-theme="dark"] .theme-toggle i:last-child {
  color: var(--accent);
}
[data-theme="dark"] .theme-toggle-thumb {
  transform: translateX(100%);
}

.follow {
  display: flex;
  gap: 0.8rem;
}

.social {
  display: grid;
  place-items: center;
  flex: 1;
  height: 4rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-2);
  font-size: 1.6rem;
  transition: transform var(--dur) var(--ease),
    color var(--dur) var(--ease-soft), border-color var(--dur) var(--ease-soft),
    background var(--dur) var(--ease-soft);
}

.social:hover {
  transform: translateY(-3px);
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}

.sidebar-copy {
  font-size: 1.15rem;
  color: var(--text-3);
  text-align: center;
}

/* mobile toggle */
.menu-toggle {
  position: fixed;
  top: 1.6rem;
  right: 1.6rem;
  z-index: 10001;
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 0.5rem;
  width: 4.8rem;
  height: 4.8rem;
  padding: 0 1.2rem;
  border-radius: var(--radius-sm);
  background: var(--accent);
  box-shadow: 0 0.8rem 2rem -0.6rem var(--accent-glow);
}

.menu-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  border-radius: 2px;
  background: #fff;
  transition: transform 0.3s var(--ease), opacity 0.2s var(--ease-soft);
}

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

.nav-backdrop {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(3px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s var(--ease-soft), visibility 0.35s;
}

.nav-backdrop.is-visible {
  opacity: 1;
  visibility: visible;
}

/* =============================== 5. Hero ================================= */

.home {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: clamp(3rem, 5vw, 6rem);
  padding-block: 12rem;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
  padding: 0.6rem 1.4rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 1.3rem;
  font-weight: 500;
  color: var(--text-2);
}

.status-dot {
  width: 0.8rem;
  height: 0.8rem;
  border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.6);
  animation: pulse 2.4s infinite;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.55);
  }
  70% {
    box-shadow: 0 0 0 0.9rem rgba(74, 222, 128, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(74, 222, 128, 0);
  }
}

.home .hi {
  display: block;
  margin-top: 2.4rem;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  color: var(--accent);
}

.home h1 {
  font-family: var(--font-display);
  font-size: var(--step-5);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -0.03em;
  margin-top: 0.4rem;
}

.home h1 span {
  background: linear-gradient(
    120deg,
    var(--accent-bright),
    var(--accent) 45%,
    var(--accent-deep)
  );
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.typing-line {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1.2rem;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 1.4vw + 1rem, 2.2rem);
  font-weight: 500;
  color: var(--text);
  min-height: 3.4rem;
}

.typing-line .prompt {
  color: var(--accent);
}

#typing::after {
  content: "";
  display: inline-block;
  width: 2px;
  height: 1.1em;
  margin-left: 4px;
  vertical-align: text-bottom;
  background: var(--accent);
  animation: blink 1s steps(2, start) infinite;
}

@keyframes blink {
  to {
    visibility: hidden;
  }
}

.lead {
  max-width: 58ch;
  margin-top: 2rem;
  font-size: var(--step-1);
  color: var(--text-2);
}

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

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem 2.4rem;
  margin-top: 2.4rem;
}

.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  font-size: 1.4rem;
  color: var(--text-2);
}

.hero-meta-item i {
  color: var(--accent);
  font-size: 1.3rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  margin-top: 3.2rem;
}

.tech-marquee {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 2rem;
  margin-top: 4rem;
  padding-top: 2.4rem;
  border-top: 1px solid var(--border);
}

.tech-marquee li {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  color: var(--text-3);
  transition: color var(--dur) var(--ease-soft);
}

.tech-marquee li:hover {
  color: var(--accent);
}

/* portrait ---------------------------------------------------------------- */

.home-visual {
  display: grid;
  place-items: center;
}

.portrait {
  position: relative;
  width: min(100%, 40rem);
  aspect-ratio: 4 / 5;
}

.portrait-halo {
  position: absolute;
  inset: 6% 8%;
  border-radius: 50% 50% 42% 42%;
  background: radial-gradient(
    circle at 50% 40%,
    var(--accent-glow),
    transparent 62%
  );
  filter: blur(30px);
  animation: float 7s ease-in-out infinite;
}

.portrait-frame {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: end center;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: linear-gradient(
    180deg,
    var(--surface) 0%,
    transparent 55%,
    var(--accent-soft) 100%
  );
  overflow: hidden;
}

.portrait-frame::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--accent),
    transparent
  );
}

.portrait-frame img {
  width: 88%;
  height: 100%;
  object-fit: contain;
  object-position: bottom;
  filter: drop-shadow(0 2rem 4rem rgba(0, 0, 0, 0.35));
}

.float-badge {
  position: absolute;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.9rem 1.4rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-solid);
  box-shadow: var(--shadow-sm);
  font-size: 1.3rem;
  font-weight: 600;
  white-space: nowrap;
  animation: float 6s ease-in-out infinite;
}

.float-badge i {
  color: var(--accent);
  font-size: 1.5rem;
}

.float-badge--1 {
  top: 12%;
  left: -6%;
}

.float-badge--2 {
  top: 46%;
  right: -8%;
  animation-delay: -2s;
}

.float-badge--3 {
  bottom: 12%;
  left: -4%;
  animation-delay: -4s;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-1.2rem);
  }
}

/* scroll cue */
.scroll-cue {
  position: absolute;
  left: 50%;
  bottom: 3.2rem;
  transform: translateX(-50%);
  display: grid;
  place-items: start center;
  width: 2.6rem;
  height: 4.4rem;
  padding-top: 0.8rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
}

.scroll-cue span {
  width: 0.4rem;
  height: 0.8rem;
  border-radius: 999px;
  background: var(--accent);
  animation: cue 1.8s var(--ease) infinite;
}

@keyframes cue {
  0% {
    transform: translateY(0);
    opacity: 0;
  }
  35% {
    opacity: 1;
  }
  100% {
    transform: translateY(1.8rem);
    opacity: 0;
  }
}

/* ========================== 6. About & stats ============================= */

.about-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: clamp(3rem, 5vw, 6rem);
  align-items: center;
}

.about-visual {
  position: relative;
  padding: 1.6rem 1.6rem 0 0;
}

.about-visual::before {
  content: "";
  position: absolute;
  inset: 0 0 4rem 4rem;
  border: 1px solid var(--accent);
  border-radius: var(--radius-lg);
  opacity: 0.45;
}

.about-photo {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, var(--surface), var(--accent-soft));
  box-shadow: var(--shadow);
  aspect-ratio: 4 / 5;
}

.about-photo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: bottom center;
  transition: transform 0.6s var(--ease);
}

.about-photo:hover img {
  transform: scale(1.03);
}

.about-experience {
  position: absolute;
  right: 0;
  bottom: 1.6rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.4rem 1.8rem;
  border-radius: var(--radius);
  background: var(--surface-solid);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.about-experience strong {
  font-family: var(--font-display);
  font-size: 3.2rem;
  line-height: 1;
  color: var(--accent);
}

.about-experience span {
  font-size: 1.2rem;
  line-height: 1.3;
  color: var(--text-2);
}

.about-content h3 {
  font-family: var(--font-display);
  font-size: var(--step-3);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.about-content h3 span {
  color: var(--accent);
}

.about-content .text {
  margin-top: 1.6rem;
  color: var(--text-2);
  font-size: var(--step-0);
}

.about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.2rem 2.4rem;
  margin-top: 2.8rem;
  padding: 2.4rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
}

.fact dt {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-3);
}

.fact dt i {
  color: var(--accent);
  font-size: 1.1rem;
}

/* the email is far longer than any other value — give it the full row */
.fact--wide {
  grid-column: 1 / -1;
}

.fact dd {
  margin-top: 0.2rem;
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--text);
  overflow-wrap: anywhere;
}

.fact dd a:hover {
  color: var(--accent);
}

.fact .ok {
  color: var(--ok);
}

.about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  margin-top: 2.8rem;
}

.toggle-inline {
  display: inline-block;
  margin-left: 0.4rem;
  color: var(--accent);
  font-weight: 600;
  font-size: 1.4rem;
  cursor: pointer;
  border-bottom: 1px dashed currentColor;
}

.toggle-inline:hover {
  color: var(--accent-bright);
}

/* stats */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.6rem;
  margin-top: clamp(5rem, 7vw, 8rem);
}

.stat {
  position: relative;
  padding: 2.8rem 2rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  text-align: center;
  overflow: hidden;
  transition: transform var(--dur) var(--ease),
    border-color var(--dur) var(--ease-soft);
}

.stat::before {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  transform: scaleX(0);
  transition: transform var(--dur) var(--ease);
}

.stat:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
}

.stat:hover::before {
  transform: scaleX(1);
}

.stat strong,
.stat > span {
  font-family: var(--font-display);
  font-size: clamp(3.2rem, 3vw, 4.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
}

.stat p {
  margin-top: 0.8rem;
  font-size: 1.4rem;
  color: var(--text-2);
}

/* ============================== 7. Skills =============================== */

.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.6rem;
}

.skill-card {
  padding: 2.8rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  transition: transform var(--dur) var(--ease),
    border-color var(--dur) var(--ease-soft),
    box-shadow var(--dur) var(--ease);
}

.skill-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}

.skill-card header {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  margin-bottom: 2rem;
  padding-bottom: 1.6rem;
  border-bottom: 1px solid var(--border);
}

.skill-card header i {
  display: grid;
  place-items: center;
  width: 4.4rem;
  height: 4.4rem;
  flex-shrink: 0;
  border-radius: 1.2rem;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 1.8rem;
}

.skill-card h3 {
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 600;
}

.soft-skills-block {
  margin-top: clamp(5rem, 7vw, 8rem);
}

.soft-skills-block .section-head {
  margin-bottom: 2.8rem;
}

.soft-chips {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(26rem, 1fr));
  gap: 1.2rem;
}

.soft-chips li {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 1.4rem 1.8rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 1.5rem;
  font-weight: 500;
  transition: transform var(--dur) var(--ease),
    border-color var(--dur) var(--ease-soft);
}

.soft-chips li:hover {
  transform: translateX(4px);
  border-color: var(--accent);
}

.soft-chips i {
  display: grid;
  place-items: center;
  width: 2.2rem;
  height: 2.2rem;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 1rem;
}

/* ============================ 8. Portfolio ============================== */

.filters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.8rem;
  margin-bottom: 4rem;
}

.filter {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 1rem 2rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-2);
  font-size: 1.4rem;
  font-weight: 500;
  transition: color var(--dur) var(--ease-soft),
    border-color var(--dur) var(--ease-soft),
    background var(--dur) var(--ease-soft), transform var(--dur) var(--ease);
}

.filter:hover {
  color: var(--text);
  transform: translateY(-2px);
  border-color: var(--border-strong);
}

.filter.is-active {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0.8rem 2rem -0.8rem var(--accent-glow);
}

.filter-count {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  opacity: 0.75;
}

.projects {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(31rem, 1fr));
  gap: 2rem;
}

.project {
  display: flex;
  flex-direction: column;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  overflow: hidden;
  transition: transform var(--dur) var(--ease),
    border-color var(--dur) var(--ease-soft),
    box-shadow var(--dur) var(--ease), opacity 0.3s var(--ease-soft);
}

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

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

.project-media {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
}

.project-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.7s var(--ease), filter 0.5s var(--ease-soft);
}

.project:hover .project-media img {
  transform: scale(1.06);
}

.project-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    transparent 45%,
    rgba(0, 0, 0, 0.35) 100%
  );
  opacity: 0;
  transition: opacity var(--dur) var(--ease-soft);
}

.project:hover .project-media::after {
  opacity: 1;
}

.project-tag {
  position: absolute;
  top: 1.2rem;
  left: 1.2rem;
  z-index: 2;
  padding: 0.5rem 1.1rem;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: 0.04em;
}

.project-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  gap: 1.2rem;
  padding: 2.2rem;
}

.project-body h3 {
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 600;
  line-height: 1.3;
  transition: color var(--dur) var(--ease-soft);
}

.project:hover .project-body h3 {
  color: var(--accent);
}

.project-body > p {
  font-size: 1.45rem;
  color: var(--text-2);
}

.project-body .chips {
  margin-top: auto;
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--border);
}

.link-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.9rem 1.6rem;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 1.3rem;
  font-weight: 600;
  transition: transform var(--dur) var(--ease),
    background var(--dur) var(--ease-soft), color var(--dur) var(--ease-soft),
    border-color var(--dur) var(--ease-soft);
}

.link-btn:hover {
  transform: translateY(-2px);
  background: var(--accent-deep);
}

.link-btn--ghost {
  background: transparent;
  border: 1px solid var(--border-strong);
  color: var(--text-2);
}

.link-btn--ghost:hover {
  background: transparent;
  border-color: var(--accent);
  color: var(--accent);
}

.projects-empty {
  margin-top: 4rem;
  text-align: center;
  color: var(--text-2);
  font-size: var(--step-1);
}

/* ========================= 9. Contact & footer ========================== */

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(28rem, 1fr));
  gap: 1.6rem;
}

.contact-card {
  position: relative;
  display: block;
  padding: 3.2rem 2.8rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  overflow: hidden;
  transition: transform var(--dur) var(--ease),
    border-color var(--dur) var(--ease-soft),
    box-shadow var(--dur) var(--ease);
}

.contact-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.contact-card--static:hover {
  transform: none;
  border-color: var(--border);
  box-shadow: none;
}

.contact-icon {
  display: grid;
  place-items: center;
  width: 5.2rem;
  height: 5.2rem;
  border-radius: 1.4rem;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 2rem;
  transition: background var(--dur) var(--ease-soft),
    color var(--dur) var(--ease-soft);
}

.contact-card:not(.contact-card--static):hover .contact-icon {
  background: var(--accent);
  color: #fff;
}

.contact-card h3 {
  margin-top: 1.8rem;
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 600;
}

.contact-card p {
  margin-top: 0.5rem;
  font-size: 1.45rem;
  color: var(--text-2);
  overflow-wrap: anywhere;
}

.contact-go {
  position: absolute;
  top: 2.8rem;
  right: 2.8rem;
  color: var(--text-3);
  font-size: 1.4rem;
  opacity: 0;
  transform: translateX(-0.6rem);
  transition: all var(--dur) var(--ease);
}

.contact-card:hover .contact-go {
  opacity: 1;
  color: var(--accent);
  transform: translateX(0);
}

.cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 2.4rem;
  margin-top: 2.4rem;
  padding: clamp(3rem, 4vw, 4.8rem);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: linear-gradient(
    135deg,
    var(--accent-soft),
    transparent 55%,
    var(--accent-soft)
  );
  position: relative;
  overflow: hidden;
}

.cta::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -10%;
  width: 34rem;
  height: 34rem;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow), transparent 65%);
  filter: blur(60px);
  pointer-events: none;
}

.cta-text {
  position: relative;
}

.cta-text h3 {
  font-family: var(--font-display);
  font-size: var(--step-3);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.cta-text p {
  margin-top: 0.6rem;
  color: var(--text-2);
  font-size: var(--step-0);
}

.cta .btn {
  position: relative;
}

.footer {
  max-width: var(--content-max);
  margin-inline: auto;
  padding: 3.2rem clamp(2rem, 5vw, 6rem) 4rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 1.4rem;
  color: var(--text-2);
}

.footer span {
  color: var(--accent);
  font-weight: 600;
}

.footer-meta {
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: 1.25rem;
}

.footer-meta span {
  color: inherit;
  font-weight: 400;
}

/* ============================== 10. Motion ============================== */

.reveal {
  opacity: 0;
  transform: translateY(2.4rem);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  transition-delay: calc(var(--reveal-delay, 0) * 90ms);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }

  .cursor-dot,
  .cursor-ring {
    display: none;
  }
}

/* ============================ 11. Responsive ============================ */

@media (hover: none), (pointer: coarse) {
  .cursor-dot,
  .cursor-ring {
    display: none;
  }
}

@media (max-width: 1200px) {
  .home {
    grid-template-columns: 1fr;
    text-align: left;
    padding-block: 10rem 8rem;
  }

  .home-visual {
    order: -1;
    justify-items: start;
  }

  .portrait {
    width: min(100%, 30rem);
  }

  .float-badge {
    font-size: 1.2rem;
  }

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

  .about-visual {
    max-width: 42rem;
  }

  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 991px) {
  html {
    font-size: 58%;
  }

  body {
    padding-left: 0;
  }

  .menu-toggle {
    display: flex;
  }

  #sidebar {
    transform: translateX(-100%);
    box-shadow: var(--shadow);
  }

  #sidebar.is-open {
    transform: translateX(0);
  }

  .scroll-progress,
  .skip-link {
    left: 0;
  }

  .cursor-dot,
  .cursor-ring {
    display: none;
  }
}

@media (max-width: 900px) {
  .skills-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  section {
    padding-inline: 2rem;
  }

  .about-facts {
    grid-template-columns: 1fr;
    padding: 2rem;
  }

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

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

  .filters {
    justify-content: flex-start;
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 0.8rem;
    scrollbar-width: none;
  }

  .filters::-webkit-scrollbar {
    display: none;
  }

  .filter {
    flex-shrink: 0;
  }

  .float-badge--1 {
    left: 0;
  }

  .float-badge--2 {
    right: 0;
  }

  .float-badge--3 {
    left: 0;
  }

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

  .footer {
    flex-direction: column;
    text-align: center;
  }

  .to-top {
    right: 1.6rem;
    bottom: 1.6rem;
  }
}

@media (max-width: 480px) {
  #sidebar {
    width: min(30rem, 88vw);
  }
}