@import url("https://fonts.googleapis.com/css2?family=Bebas+Neue&family=DM+Mono:ital,wght@0,300;0,400;1,300&family=Crimson+Pro:ital,wght@0,300;0,400;1,300&display=swap");

@layer reset, tokens, base, layout, cube, ui, cards, reveal, theme, responsive;

/* ─────────────────────────── RESET ─────────────────────────── */
@layer reset {
  *,
  *::before,
  *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  ul { list-style: none; }
  a { text-decoration: none; }
}

/* ─────────────────────────── TOKENS ─────────────────────────── */
@layer tokens {
  :root {
    color-scheme: dark;

    /* Palette dark */
    --dark-bg:      #0e0c0a;
    --dark-surface: #161310;
    --dark-fg:      #e8e2d9;
    --dark-muted:   #7a6e62;
    --dark-border:  rgba(255,165,0,0.12);
    --dark-accent:  #f0a500;
    --dark-accent2: #e05a00;

    /* Palette light */
    --light-bg:      #f4f0e8;
    --light-surface: #ede8df;
    --light-fg:      #110e09;
    --light-muted:   #8a8478;
    --light-border:  rgba(58,110,0,0.14);
    --light-accent:  #2d6e00;
    --light-accent2: #a33000;

    /* Active theme */
    --bg:      var(--dark-bg);
    --surface: var(--dark-surface);
    --fg:      var(--dark-fg);
    --muted:   var(--dark-muted);
    --border:  var(--dark-border);
    --accent:  var(--dark-accent);
    --accent2: var(--dark-accent2);

    /* Fonts */
    --font-display: "Bebas Neue", sans-serif;
    --font-mono:    "DM Mono", monospace;
    --font-serif:   "Crimson Pro", serif;

    /* Layout */
    --ui-inset: 2rem;
    --hairline:  0.0625rem;
    --nav-x:     calc(var(--ui-inset) + 0.125rem);
    --z-ui: 10;

    /* Card */
    --card-bg:     rgba(14, 12, 10, 0.85);
    --card-border: var(--border);

    /* Reveal */
    --reveal-offset:   0.75rem;
    --reveal-duration: 0.55s;
  }
}

/* ─────────────────────────── BASE ─────────────────────────── */
@layer base {
  html {
    scroll-behavior: auto; /* handled by JS */
    color-scheme: dark;
  }

  body {
    background: var(--bg);
    color: var(--fg);
    font-family: var(--font-mono);
    overflow-x: hidden;
    transition: background 0.35s ease, color 0.35s ease;
  }

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

  em {
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--accent);
  }
}

/* ─────────────────────────── LAYOUT ─────────────────────────── */
@layer layout {
  #scene {
    position: fixed;
    inset: 0;
    z-index: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    perspective: 1200px;
    pointer-events: none;
  }

  #scroll_container {
    position: relative;
    z-index: 1;
  }

  section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 6rem calc(5rem + var(--ui-inset)) 6rem 5rem;
  }
}

/* ─────────────────────────── CUBE ─────────────────────────── */
@layer cube {
  #cube {
    --s: min(72vw, 72vh, 540px);
    width: var(--s);
    height: var(--s);
    position: relative;
    transform-style: preserve-3d;
    transform: rotateX(90deg) rotateY(0deg);
    will-change: transform;
  }

  .face {
    position: absolute;
    inset: 0;
    overflow: hidden;
    backface-visibility: hidden;
    background:
      repeating-linear-gradient(
        0deg,
        rgba(255,255,255,0.025) 0,
        rgba(255,255,255,0.025) 1px,
        transparent 1px,
        transparent 52px
      ),
      repeating-linear-gradient(
        90deg,
        rgba(255,255,255,0.025) 0,
        rgba(255,255,255,0.025) 1px,
        transparent 1px,
        transparent 52px
      ),
      var(--dark-surface);
    border: 0.5px solid rgba(255,165,0,0.06);
    transition: background 0.35s ease;
  }

  /* animated corner accent */
  .face::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(
      ellipse 60% 60% at 80% 20%,
      rgba(240,165,0,0.08) 0%,
      transparent 70%
    );
    pointer-events: none;
  }

  .face-grid {
    position: absolute;
    inset: 0;
    pointer-events: none;
  }

  .face-label {
    position: absolute;
    bottom: 1.25rem;
    left: 1.75rem;
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 10vw, 6rem);
    letter-spacing: 0.03em;
    color: rgba(255,255,255,0.04);
    pointer-events: none;
    user-select: none;
    line-height: 1;
  }

  /* Face transforms */
  .face[data-face="front"]  { transform: translateZ(calc(var(--s)/2)); }
  .face[data-face="back"]   { transform: rotateY(180deg) translateZ(calc(var(--s)/2)); }
  .face[data-face="right"]  { transform: rotateY(90deg) translateZ(calc(var(--s)/2)); }
  .face[data-face="left"]   { transform: rotateY(-90deg) translateZ(calc(var(--s)/2)); }
  .face[data-face="top"]    { transform: rotateX(-90deg) translateZ(calc(var(--s)/2)); }
  .face[data-face="bottom"] { transform: rotateX(90deg) translateZ(calc(var(--s)/2)); }

  /* Colora ogni faccia in modo sottile */
  .face[data-face="front"]  .face-grid { background: radial-gradient(circle at 30% 70%, rgba(240,165,0,0.07), transparent 60%); }
  .face[data-face="right"]  .face-grid { background: radial-gradient(circle at 70% 30%, rgba(224,90,0,0.07), transparent 60%); }
  .face[data-face="back"]   .face-grid { background: radial-gradient(circle at 50% 50%, rgba(240,165,0,0.05), transparent 60%); }
  .face[data-face="left"]   .face-grid { background: radial-gradient(circle at 20% 80%, rgba(224,90,0,0.06), transparent 60%); }
  .face[data-face="top"]    .face-grid { background: radial-gradient(circle at 80% 20%, rgba(240,165,0,0.09), transparent 60%); }
  .face[data-face="bottom"] .face-grid { background: radial-gradient(circle at 50% 50%, rgba(100,100,100,0.05), transparent 60%); }
}

/* ─────────────────────────── UI CHROME ─────────────────────────── */
@layer ui {
  /* HUD top-right */
  #hud {
    position: fixed;
    top: var(--ui-inset);
    right: var(--ui-inset);
    z-index: var(--z-ui);
    text-align: right;
    font-size: 0.62rem;
    letter-spacing: 0.18em;
    color: var(--muted);
    text-transform: uppercase;
    user-select: none;
  }

  #hud_pct {
    font-family: var(--font-display);
    font-size: 1.1rem;
    color: var(--fg);
    opacity: 0.35;
    letter-spacing: 0.05em;
  }

  .progress-bar {
    width: 6rem;
    height: var(--hairline);
    background: color-mix(in srgb, var(--muted) 30%, transparent);
    margin-block-start: 0.4rem;
    margin-inline-start: auto;
    position: relative;
    overflow: hidden;
  }

  .progress-fill {
    position: absolute;
    inset-block: 0;
    inset-inline-start: 0;
    width: 0%;
    background: var(--accent);
    transition: width 0.1s linear;
  }

  .scene-label {
    font-size: 0.55rem;
    color: var(--accent);
    margin-block-start: 0.35rem;
    letter-spacing: 0.22em;
  }

  /* Side nav */
  #scene_strip {
    position: fixed;
    left: var(--nav-x);
    top: 50%;
    translate: -50% -50%;
    z-index: var(--z-ui);
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
  }

  .scene-dot {
    position: relative;
    display: block;
    width: 0.25rem;
    height: 0.25rem;
    border-radius: 50%;
    background: var(--muted);
    transition: background 0.3s, scale 0.3s;
    cursor: pointer;
  }

  .scene-dot::before {
    content: "";
    position: absolute;
    inset: -0.3rem;
  }

  .scene-dot.active {
    background: var(--accent);
    scale: 1.9;
  }

  /* Theme toggle */
  #theme_toggle {
    position: fixed;
    bottom: var(--ui-inset);
    left: var(--nav-x);
    translate: -50% 0;
    z-index: var(--z-ui);
    width: 2.25rem;
    height: 2.25rem;
    border: var(--hairline) solid color-mix(in srgb, var(--muted) 30%, transparent);
    background: color-mix(in srgb, var(--muted) 10%, transparent);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s, border-color 0.3s;
  }

  #theme_toggle:hover {
    background: color-mix(in srgb, var(--muted) 25%, transparent);
    border-color: var(--accent);
  }

  #theme_toggle svg {
    width: 0.9rem;
    height: 0.9rem;
    position: absolute;
    transition: opacity 0.3s ease, rotate 0.3s ease;
    color: var(--accent);
  }

  .icon-sun  { opacity: 1; rotate: 0deg; }
  .icon-moon { opacity: 0; rotate: 90deg; }

  /* Face caption bottom-center */
  #face_caption {
    position: fixed;
    bottom: var(--ui-inset);
    left: 50%;
    translate: -50% 0;
    z-index: var(--z-ui);
    text-align: center;
    pointer-events: none;
    user-select: none;
  }

  #face_caption_num {
    font-size: 0.55rem;
    letter-spacing: 0.32em;
    color: var(--accent);
    text-transform: uppercase;
    margin-block-end: 0.1rem;
  }

  #face_caption_name {
    font-family: var(--font-display);
    font-size: clamp(1.6rem, 4.5vw, 3.2rem);
    letter-spacing: 0.1em;
    color: var(--muted);
    opacity: 0.45;
    line-height: 1;
  }

  /* Footer credit */
  #credit {
    position: fixed;
    right: var(--ui-inset);
    top: 50%;
    transform: translateY(-50%) rotate(-90deg);
    transform-origin: right center;
    z-index: var(--z-ui);
    font-size: 0.58rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--muted);
    pointer-events: none;
    user-select: none;
    opacity: 0.5;
  }
}

/* ─────────────────────────── CARDS ─────────────────────────── */
@layer cards {
  .text-card {
    max-width: 26rem;
    padding: 2.5rem 2.25rem;
    background: var(--card-bg);
    border-left: var(--hairline) solid var(--card-border);
    backdrop-filter: blur(8px) saturate(130%);
    -webkit-backdrop-filter: blur(8px) saturate(130%);
    transition: background 0.35s ease, border-color 0.35s ease;
  }

  .text-card.right {
    margin-inline-start: auto;
    border-left: none;
    border-right: var(--hairline) solid var(--card-border);
    text-align: right;
  }

  .text-card.right .h-line {
    transform-origin: right;
    margin-inline-start: auto;
  }

  .text-card.right .cta-row {
    justify-content: flex-end;
  }

  /* Tag */
  .tag {
    font-size: 0.58rem;
    letter-spacing: 0.28em;
    text-transform: uppercase;
    color: var(--accent);
    margin-block-end: 1rem;
  }

  /* Titles */
  h1, h2 {
    font-family: var(--font-display);
    font-weight: 400;
    letter-spacing: 0.02em;
    line-height: 0.9;
  }

  h1 { font-size: clamp(3rem, 9vw, 7rem); }
  h2 { font-size: clamp(2.4rem, 5.5vw, 4.2rem); }

  /* Body */
  .body-text {
    font-size: 0.78rem;
    line-height: 1.85;
    color: color-mix(in srgb, var(--fg) 55%, transparent);
    margin-block-start: 1.25rem;
    font-family: var(--font-mono);
  }

  /* Horizontal rule accent */
  .h-line {
    width: 2.75rem;
    height: var(--hairline);
    background: var(--accent);
    margin-block-end: 1.25rem;
    transform-origin: left;
  }

  /* CTA row */
  .cta-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-block-start: 1.75rem;
    flex-wrap: wrap;
  }

  /* Primary CTA */
  .cta {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.6rem 1.2rem;
    border: var(--hairline) solid var(--accent);
    color: var(--accent);
    font-family: var(--font-mono);
    font-size: 0.6rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
  }

  .cta svg { width: 0.65rem; height: 0.65rem; }

  .cta:hover {
    background: var(--accent);
    color: var(--bg);
  }

  /* Ghost CTA */
  .cta-ghost {
    display: inline-flex;
    align-items: center;
    padding: 0.6rem 1.2rem;
    border: var(--hairline) solid color-mix(in srgb, var(--muted) 40%, transparent);
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.6rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    cursor: pointer;
    transition: background 0.2s, color 0.2s, border-color 0.2s;
  }

  .cta-ghost:hover {
    border-color: var(--fg);
    color: var(--fg);
  }

  /* Back CTA */
  .cta-back {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.6rem 1.2rem;
    border: var(--hairline) solid color-mix(in srgb, var(--muted) 35%, transparent);
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.6rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    transition: background 0.2s, color 0.2s, border-color 0.2s;
  }

  .cta-back svg { width: 0.65rem; height: 0.65rem; }

  .cta-back:hover {
    background: color-mix(in srgb, var(--muted) 10%, transparent);
    border-color: var(--muted);
    color: var(--fg);
  }

  /* Stats */
  .stat-row {
    display: flex;
    gap: 2rem;
    margin-block-start: 1.75rem;
    flex-wrap: wrap;
  }

  .stat {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
  }

  .stat-num {
    font-family: var(--font-display);
    font-size: 2.5rem;
    color: var(--accent);
    line-height: 1;
  }

  .stat-label {
    font-size: 0.55rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--muted);
    max-width: 8rem;
    line-height: 1.4;
  }

  /* Services list */
  .service-list {
    margin-block-start: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
  }

  .service-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    font-size: 0.72rem;
    line-height: 1.65;
    color: color-mix(in srgb, var(--fg) 60%, transparent);
  }

  .svc-icon {
    color: var(--accent);
    font-size: 0.6rem;
    margin-block-start: 0.25rem;
    flex-shrink: 0;
    opacity: 0.7;
  }

  .service-list strong {
    color: var(--fg);
    display: block;
    font-size: 0.68rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-block-end: 0.1rem;
    font-weight: 400;
  }

  /* Tech stack grid */
  .stack-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem 1.5rem;
    margin-block-start: 1.5rem;
  }

  .stack-group {}

  .stack-label {
    font-size: 0.55rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--accent);
    margin-block-end: 0.4rem;
  }

  .stack-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem;
    justify-content: flex-end;
  }

  .text-card:not(.right) .stack-pills {
    justify-content: flex-start;
  }

  .pill {
    display: inline-block;
    padding: 0.2rem 0.55rem;
    font-size: 0.58rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    background: color-mix(in srgb, var(--muted) 12%, transparent);
    border: var(--hairline) solid color-mix(in srgb, var(--muted) 25%, transparent);
    color: var(--fg);
    transition: background 0.2s, border-color 0.2s;
  }

  .pill:hover {
    background: color-mix(in srgb, var(--accent) 12%, transparent);
    border-color: color-mix(in srgb, var(--accent) 40%, transparent);
  }

  .pill.accent {
    border-color: color-mix(in srgb, var(--accent) 50%, transparent);
    color: var(--accent);
    background: color-mix(in srgb, var(--accent) 8%, transparent);
  }

  /* Contact links */
  .contact-links {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    margin-block-start: 1.5rem;
    align-items: flex-end;
  }

  .contact-item {
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    color: color-mix(in srgb, var(--fg) 60%, transparent);
    transition: color 0.2s;
  }

  .contact-item:hover {
    color: var(--accent);
  }

  .contact-icon {
    color: var(--accent);
    font-size: 0.9rem;
    opacity: 0.7;
  }

  /* Back to top */
  .back-top {
    margin-block-start: 2rem;
    text-align: right;
  }

  .back-top a {
    font-size: 0.58rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--muted);
    transition: color 0.2s;
  }

  .back-top a:hover {
    color: var(--accent);
  }
}

/* ─────────────────────────── REVEAL ─────────────────────────── */
@layer reveal {
  :is(.tag, h1, h2, .body-text, .stat-row, .service-list,
      .stack-grid, .contact-links, .cta, .cta-ghost, .cta-back) {
    opacity: 0;
    translate: 0 var(--reveal-offset);
  }

  :is(h1, h2) {
    translate: 0 1.25rem;
    transition:
      opacity var(--reveal-duration) ease 0.06s,
      translate var(--reveal-duration) ease 0.06s;
  }

  .tag {
    transition:
      opacity var(--reveal-duration) ease,
      translate var(--reveal-duration) ease;
  }

  .body-text {
    transition:
      opacity var(--reveal-duration) ease 0.18s,
      translate var(--reveal-duration) ease 0.18s;
  }

  .service-list, .stack-grid, .contact-links {
    transition:
      opacity var(--reveal-duration) ease 0.22s,
      translate var(--reveal-duration) ease 0.22s;
  }

  .stat-row {
    transition:
      opacity var(--reveal-duration) ease 0.28s,
      translate var(--reveal-duration) ease 0.28s;
  }

  :is(.cta, .cta-ghost, .cta-back) {
    transition:
      opacity var(--reveal-duration) ease 0.34s,
      translate var(--reveal-duration) ease 0.34s,
      background 0.2s, color 0.2s, border-color 0.2s;
  }

  .h-line {
    opacity: 0;
    scale: 0 1;
    transition: opacity 0.45s ease, scale 0.45s ease;
  }

  :is(.tag, h1, h2, .body-text, .stat-row, .service-list,
      .stack-grid, .contact-links, .cta, .cta-ghost, .cta-back).visible {
    opacity: 1;
    translate: 0 0;
  }

  .h-line.visible {
    opacity: 1;
    scale: 1 1;
  }
}

/* ─────────────────────────── THEME ─────────────────────────── */
@layer theme {
  :root[data-theme="light"] {
    color-scheme: light;
    --bg:      var(--light-bg);
    --surface: var(--light-surface);
    --fg:      var(--light-fg);
    --muted:   var(--light-muted);
    --border:  var(--light-border);
    --accent:  var(--light-accent);
    --accent2: var(--light-accent2);
    --card-bg: rgba(244, 240, 232, 0.88);
    --card-border: var(--light-border);
  }

  :root[data-theme="light"] .face {
    background:
      repeating-linear-gradient(
        0deg,
        rgba(0,0,0,0.04) 0,
        rgba(0,0,0,0.04) 1px,
        transparent 1px,
        transparent 52px
      ),
      repeating-linear-gradient(
        90deg,
        rgba(0,0,0,0.04) 0,
        rgba(0,0,0,0.04) 1px,
        transparent 1px,
        transparent 52px
      ),
      #dbd7ce;
    border-color: rgba(58,110,0,0.08);
  }

  :root[data-theme="light"] .face-label {
    color: rgba(0,0,0,0.05);
  }

  :root[data-theme="light"] #theme_toggle .icon-sun  { opacity: 0; rotate: -90deg; }
  :root[data-theme="light"] #theme_toggle .icon-moon { opacity: 1; rotate: 0deg; }
  :root[data-theme="light"] #theme_toggle svg { color: var(--light-fg); }

  :root[data-theme="light"] #face_caption_name { opacity: 0.3; }
}

/* ─────────────────────────── RESPONSIVE ─────────────────────────── */
@layer responsive {
  @media (width <= 56.25em) {
    :root {
      --ui-inset: 1rem;
    }

    #scene_strip { display: none; }

    #theme_toggle {
      bottom: 1rem;
      left: 1.25rem;
      translate: 0 0;
    }

    #face_caption { bottom: 1rem; }

    #hud { top: 1rem; right: 1rem; }

    section {
      min-height: 150vh;
      align-items: flex-end;
      padding: 0 1.25rem 4rem;
    }

    #s0 {
      min-height: 100vh;
      align-items: center;
      padding: 4rem 1.25rem;
    }

    .text-card,
    .text-card.right {
      max-width: 100%;
      padding: 1.75rem 1.25rem;
    }

    .service-list { gap: 0.75rem; }

    .stack-grid {
      grid-template-columns: 1fr;
      gap: 0.8rem;
    }

    .text-card.right .stack-pills {
      justify-content: flex-start;
    }

    .text-card.right .contact-links {
      align-items: flex-start;
    }

    .text-card.right .back-top {
      text-align: left;
    }

    .stat-row { gap: 1.5rem; }

    .cta-row { margin-block-start: 1.25rem; flex-wrap: wrap; }

    .body-text { line-height: 1.65; }
  }

  @media (width <= 30em) {
    h1 { font-size: clamp(2.4rem, 14vw, 4rem); }
    h2 { font-size: clamp(2rem, 11vw, 3rem); }
    .stat-num { font-size: 2rem; }
  }

  @media (prefers-reduced-motion: reduce) {
    * {
      animation-duration: 0.01ms !important;
      transition-duration: 0.01ms !important;
    }
  }
}