/* =====================================================
   Ricardo Alonso Pérez — Portafolio
   White Formal Elegant Design | css/styles.css
   ===================================================== */

:root {
  --bg:        #ffffff;
  --bg-alt:    #f7f8fc;
  --bg-soft:   #eef0f8;
  --card:      #ffffff;
  --border:    #e2e6f0;
  --border-2:  #c8d0e4;
  --text-1:    #0c1630;
  --text-2:    #4b5673;
  --text-3:    #8e97b0;
  --navy:      #007799;
  --indigo:    #00aadd;
  --violet:    #00ccff;
  --grad:      linear-gradient(135deg, #007799 0%, #00aadd 100%);
  --grad-2:    linear-gradient(135deg, #00aadd 0%, #00ccff 100%);
  --soft:      rgba(0, 170, 221, 0.09);
  --soft-b:    rgba(0, 170, 221, 0.28);
  --green:     #059669;
  --red:       #dc2626;
  --font:      'Inter', system-ui, sans-serif;
  --display:   'Playfair Display', Georgia, serif;
  --mono:      'JetBrains Mono', monospace;
  --r:         14px;
  --r-sm:      10px;
  --r-lg:      20px;
  --shadow-xs: 0 1px 3px rgba(12,22,48,0.06);
  --shadow-sm: 0 2px 10px rgba(12,22,48,0.07);
  --shadow:    0 6px 24px rgba(12,22,48,0.09);
  --shadow-lg: 0 20px 56px rgba(12,22,48,0.12);
  --shadow-b:  0 8px 28px rgba(0,170,221,0.28);
  --ease:      0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-1);
  line-height: 1.7;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; }
::selection { background: var(--indigo); color: #fff; }

/* ── Navbar ── */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 1rem 0;
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: var(--ease);
}
.navbar.scrolled { box-shadow: var(--shadow-sm); }

.nav-container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-family: var(--display);
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--text-1);
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  letter-spacing: -0.3px;
}
.brand-dot {
  width: 9px; height: 9px;
  background: var(--grad);
  border-radius: 3px;
  display: inline-block;
  flex-shrink: 0;
}

.nav-menu { display: flex; align-items: center; gap: 0.15rem; }

.nav-link {
  color: var(--text-2);
  font-weight: 500;
  font-size: 0.9rem;
  padding: 0.48rem 0.95rem;
  border-radius: 50px;
  transition: var(--ease);
}
.nav-link:hover,
.nav-link.active { color: var(--indigo); background: var(--soft); }

.nav-cta {
  background: var(--grad);
  color: #fff !important;
  font-weight: 700;
  padding: 0.52rem 1.4rem;
  margin-left: 0.6rem;
  box-shadow: var(--shadow-b);
}
.nav-cta:hover { opacity: 0.88; transform: translateY(-1px); background: var(--grad); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  z-index: 10;
}
.nav-toggle span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text-1);
  border-radius: 2px;
  transition: var(--ease);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Container ── */
.container { max-width: 1180px; margin: 0 auto; padding: 0 2rem; }

/* ── Sections ── */
.section { padding: 7rem 0; position: relative; }
.section-alt { background: var(--bg-alt); }

.section-header { text-align: center; margin-bottom: 4rem; }

.tag {
  display: inline-flex;
  align-items: center;
  font-size: 0.73rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.8px;
  color: var(--indigo);
  background: var(--soft);
  border: 1px solid var(--soft-b);
  padding: 0.38rem 1.1rem;
  border-radius: 50px;
  margin-bottom: 1rem;
}

.section-title {
  font-family: var(--display);
  font-size: clamp(2rem, 4vw, 2.9rem);
  font-weight: 800;
  color: var(--text-1);
  line-height: 1.18;
  letter-spacing: -0.5px;
  margin-bottom: 0.8rem;
}

.section-desc { color: var(--text-2); font-size: 1.04rem; max-width: 500px; margin: 0 auto; }

/* ── Divider accent ── */
.divider {
  width: 48px; height: 3px;
  background: var(--grad);
  border-radius: 3px;
  margin: 1rem auto 0;
}

/* ── Base card ── */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-sm);
  transition: var(--ease);
}
.card:hover {
  border-color: var(--border-2);
  box-shadow: var(--shadow);
}

/* ── Buttons ── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--grad);
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 0.88rem 2.1rem;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  transition: var(--ease);
  box-shadow: var(--shadow-b);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 40px rgba(59,82,232,0.32);
  color: #fff;
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: #fff;
  color: var(--text-1);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.85rem 2.1rem;
  border-radius: 50px;
  border: 1.5px solid var(--border-2);
  cursor: pointer;
  transition: var(--ease);
}
.btn-ghost:hover {
  border-color: var(--indigo);
  color: var(--indigo);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}
.btn-full { width: 100%; justify-content: center; }

/* ── Hero ── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 5rem;
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(ellipse 900px 600px at 95% -5%,  rgba(59,82,232,0.055), transparent 70%),
    radial-gradient(ellipse 700px 500px at -5% 105%, rgba(109,40,217,0.04),  transparent 70%),
    var(--bg);
}

/* Decorative line */
.hero::after {
  content: '';
  position: absolute;
  top: 0; bottom: 0; right: 48%;
  width: 1px;
  background: linear-gradient(to bottom, transparent, rgba(59,82,232,0.1) 30%, rgba(59,82,232,0.1) 70%, transparent);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 5rem;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--soft);
  border: 1px solid var(--soft-b);
  color: var(--indigo);
  font-size: 0.83rem;
  font-weight: 600;
  padding: 0.48rem 1.2rem;
  border-radius: 50px;
  margin-bottom: 1.75rem;
}

.pulse {
  width: 7px; height: 7px;
  background: var(--green);
  border-radius: 50%;
  flex-shrink: 0;
  animation: pulse-anim 2s infinite;
}
@keyframes pulse-anim {
  0%,100% { box-shadow: 0 0 0 0 rgba(5,150,105,0.4); }
  50%     { box-shadow: 0 0 0 6px rgba(5,150,105,0); }
}

.hero-title {
  font-family: var(--display);
  font-size: clamp(3rem, 6.5vw, 5rem);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -2px;
  color: var(--text-1);
  margin-bottom: 1.25rem;
}
.gradient-text {
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--text-2);
  margin-bottom: 1.5rem;
  min-height: 2rem;
}
.cursor-blink { color: var(--indigo); animation: blink 1s step-end infinite; }
@keyframes blink { 0%,100% { opacity:1; } 50% { opacity:0; } }

.hero-desc {
  color: var(--text-2);
  font-size: 1.06rem;
  max-width: 520px;
  line-height: 1.88;
  margin-bottom: 2.25rem;
}

.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 2.5rem; }

.hero-stack { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tech-badge {
  font-family: var(--mono);
  font-size: 0.71rem;
  font-weight: 500;
  color: var(--text-3);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  padding: 0.27rem 0.82rem;
  border-radius: 50px;
}

/* ── Avatar ── */
.hero-visual { display: flex; justify-content: center; }
.avatar-wrapper { display: flex; flex-direction: column; align-items: center; gap: 1.5rem; }
.avatar-ring { position: relative; display: flex; align-items: center; justify-content: center; }

.avatar-orbit {
  position: absolute;
  width: 310px; height: 310px;
  border-radius: 50%;
  border: 1.5px dashed var(--border-2);
  animation: spin 28s linear infinite;
}
.avatar-orbit::before {
  content: '';
  position: absolute;
  top: -9px; left: 50%;
  width: 17px; height: 17px;
  background: var(--grad);
  border-radius: 50%;
  box-shadow: 0 0 0 5px var(--soft);
}
@keyframes spin { to { transform: rotate(360deg); } }

.avatar-frame {
  width: 272px; height: 272px;
  border-radius: 50%;
  padding: 4px;
  background: var(--grad);
  box-shadow: var(--shadow-lg);
  position: relative; z-index: 1;
}
.avatar-frame img {
  width: 100%; height: 100%;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  background: var(--bg-soft);
}

.status-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.84rem;
  color: var(--text-2);
  background: var(--card);
  border: 1px solid var(--border);
  padding: 0.55rem 1.3rem;
  border-radius: 50px;
  box-shadow: var(--shadow-xs);
  font-weight: 500;
}
.status-pulse {
  width: 8px; height: 8px;
  background: var(--green);
  border-radius: 50%;
  animation: pulse-anim 2s infinite;
}

/* ── About ── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

.about-icon-box {
  width: 50px; height: 50px;
  background: var(--soft);
  border: 1px solid var(--soft-b);
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  color: var(--indigo);
  font-size: 1.25rem;
  margin-bottom: 1.75rem;
}

.about-text { color: var(--text-2); font-size: 0.97rem; line-height: 1.95; margin-bottom: 1rem; }
.about-text:last-child { margin-bottom: 0; }
.about-text strong { color: var(--text-1); font-weight: 700; }

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

.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 1.75rem 1.5rem;
  text-align: center;
  box-shadow: var(--shadow-xs);
  transition: var(--ease);
}
.stat-card:hover {
  border-color: var(--soft-b);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.stat-number {
  font-family: var(--display);
  font-size: 2.8rem;
  font-weight: 900;
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  display: inline;
}
.stat-plus {
  font-size: 1.4rem; font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label {
  color: var(--text-3);
  font-size: 0.77rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-top: 0.45rem;
}
.stat-bar { margin-top: 1rem; height: 3px; background: var(--bg-soft); border-radius: 3px; overflow: hidden; }
.stat-fill { height: 100%; width: 0%; background: var(--grad); border-radius: 3px; transition: width 1.6s ease; }

/* ── Skills ── */
.skills-category {
  color: var(--text-1);
  font-weight: 700;
  font-size: 0.94rem;
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-bottom: 1.5rem;
}
.skills-category i { color: var(--indigo); }
.mt-5 { margin-top: 3rem; }

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(138px, 1fr));
  gap: 1rem;
}

.skill-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 1.75rem 1.2rem;
  text-align: center;
  box-shadow: var(--shadow-xs);
  transition: var(--ease);
  position: relative;
  overflow: hidden;
}
.skill-card::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--grad);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}
.skill-card:hover {
  border-color: var(--soft-b);
  transform: translateY(-5px);
  box-shadow: var(--shadow);
}
.skill-card:hover::after { transform: scaleX(1); }

.skill-icon {
  font-size: 2.1rem;
  margin-bottom: 0.7rem;
  display: block;
}
.skill-name { font-size: 0.86rem; font-weight: 700; color: var(--text-1); display: block; margin-bottom: 0.8rem; }
.skill-progress { width: 80%; height: 3px; background: var(--bg-soft); border-radius: 3px; overflow: hidden; margin: 0 auto 0.4rem; }
.skill-bar-fill { height: 100%; width: 0%; background: var(--grad); border-radius: 3px; transition: width 1.3s ease; }
.skill-pct { font-family: var(--mono); font-size: 0.69rem; color: var(--text-3); }

.soft-skills { display: flex; flex-wrap: wrap; gap: 0.55rem; }
.soft-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text-2);
  font-size: 0.87rem;
  font-weight: 500;
  padding: 0.58rem 1.25rem;
  border-radius: 50px;
  box-shadow: var(--shadow-xs);
  transition: var(--ease);
}
.soft-tag i { color: var(--indigo); }
.soft-tag:hover {
  background: var(--soft);
  border-color: var(--soft-b);
  color: var(--indigo);
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
}

/* ── Projects ── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-xs);
  transition: var(--ease);
}
.project-card:hover {
  border-color: var(--soft-b);
  box-shadow: var(--shadow-lg);
  transform: translateY(-8px);
}

.project-preview {
  height: 235px;
  background: var(--bg-soft);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 3.3rem;
  position: relative;
  overflow: hidden;
}

/* Gradiente inferior siempre visible */
.project-preview::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 70px;
  background: linear-gradient(to top, rgba(12,22,48,0.45), transparent);
  pointer-events: none;
  z-index: 1;
}

.project-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center center;
  display: block;
  transition: transform 0.55s cubic-bezier(0.4, 0, 0.2, 1);
}
.project-card:hover .project-preview img { transform: scale(1.07); }

/* Overlay hover */
.project-overlay {
  position: absolute;
  inset: 0;
  background: rgba(26,43,94,0.62);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.35s ease;
  z-index: 2;
  backdrop-filter: blur(2px);
}
.project-overlay i {
  color: #fff;
  font-size: 2.2rem;
  transform: scale(0.6);
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
  filter: drop-shadow(0 4px 12px rgba(0,0,0,0.4));
}
.project-card:hover .project-overlay { opacity: 1; }
.project-card:hover .project-overlay i { transform: scale(1); }

.project-preview i.skill-icon-placeholder {
  background: var(--grad-2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.project-num {
  position: absolute;
  top: 1rem; right: 1.25rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: #fff;
  background: rgba(12,22,48,0.55);
  padding: 0.22rem 0.7rem;
  border-radius: 50px;
  border: 1px solid rgba(255,255,255,0.2);
  font-weight: 700;
  z-index: 3;
  backdrop-filter: blur(6px);
}

.project-content { padding: 1.75rem; flex: 1; display: flex; flex-direction: column; }
.project-title { font-size: 1.08rem; font-weight: 800; color: var(--text-1); margin-bottom: 0.6rem; letter-spacing: -0.2px; }
.project-desc { color: var(--text-2); font-size: 0.9rem; line-height: 1.78; flex: 1; }

.project-tags { display: flex; flex-wrap: wrap; gap: 0.38rem; margin-top: 1rem; }
.project-tag {
  background: var(--soft);
  color: var(--indigo);
  font-size: 0.71rem;
  font-weight: 700;
  padding: 0.22rem 0.7rem;
  border-radius: 50px;
  border: 1px solid var(--soft-b);
}

.project-links {
  display: flex; gap: 1.5rem;
  margin-top: 1.25rem; padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}
.project-link {
  color: var(--text-2);
  font-size: 0.87rem;
  font-weight: 600;
  display: inline-flex; align-items: center; gap: 0.35rem;
  transition: var(--ease);
}
.project-link:hover { color: var(--indigo); }

/* ── Contact ── */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 390px;
  gap: 2rem;
  align-items: start;
}

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem; }
.form-group { margin-bottom: 1.2rem; }

.form-label { display: block; font-size: 0.84rem; font-weight: 600; color: var(--text-2); margin-bottom: 0.44rem; }

.form-input {
  width: 100%;
  background: var(--bg-alt);
  border: 1.5px solid var(--border);
  color: var(--text-1);
  border-radius: var(--r-sm);
  padding: 0.82rem 1.1rem;
  font-size: 0.94rem;
  font-family: var(--font);
  transition: var(--ease);
  outline: none;
  resize: none;
}
.form-input:focus {
  background: var(--bg);
  border-color: var(--indigo);
  box-shadow: 0 0 0 4px var(--soft);
}
.form-input::placeholder { color: var(--text-3); }
.form-input.error   { border-color: var(--red);   box-shadow: 0 0 0 4px rgba(220,38,38,0.08); }
.form-input.success { border-color: var(--green); box-shadow: 0 0 0 4px rgba(5,150,105,0.08); }

.field-error { display: block; font-size: 0.76rem; color: var(--red); margin-top: 0.3rem; }
.form-submit { margin-top: 0.5rem; }

.info-heading {
  font-size: 1.05rem; font-weight: 700; color: var(--text-1);
  margin-bottom: 1.75rem;
  display: flex; align-items: center; gap: 0.5rem;
}
.info-heading i { color: var(--indigo); }

.info-item { display: flex; align-items: center; gap: 1rem; margin-bottom: 1.5rem; }
.info-icon {
  width: 46px; height: 46px;
  background: var(--soft);
  border: 1px solid var(--soft-b);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  color: var(--indigo); font-size: 1.1rem;
  flex-shrink: 0;
}
.info-label { font-size: 0.73rem; color: var(--text-3); font-weight: 500; margin-bottom: 0.15rem; }
.info-value { font-weight: 700; font-size: 0.92rem; color: var(--text-1); }

.social-section { margin-top: 1.75rem; padding-top: 1.75rem; border-top: 1px solid var(--border); }
.social-label { font-size: 0.73rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1.2px; color: var(--text-3); margin-bottom: 1rem; }

.social-links { display: flex; gap: 0.6rem; }
.social-link {
  width: 44px; height: 44px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-2); font-size: 1.1rem;
  transition: var(--ease);
}
.social-link:hover {
  background: var(--grad);
  border-color: transparent;
  color: #fff;
  transform: translateY(-4px);
  box-shadow: var(--shadow-b);
}

/* ── QR Section ── */
.qr-section {
  margin-top: 1.75rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border);
  text-align: center;
}
.qr-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-2);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
}
.qr-label i { color: var(--indigo); font-size: 1rem; }

#qrCode {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 10px;
  box-shadow: var(--shadow-sm);
  transition: var(--ease);
}
#qrCode:hover {
  border-color: var(--soft-b);
  box-shadow: var(--shadow);
  transform: scale(1.03);
}
#qrCode img,
#qrCode canvas { display: block; border-radius: 4px; }

.qr-hint {
  font-size: 0.72rem;
  color: var(--text-3);
  margin-top: 0.6rem;
}

/* ── Footer ── */
footer {
  background: var(--text-1);
  padding: 3rem 0;
}
.footer-inner { display: flex; flex-direction: column; align-items: center; gap: 1rem; text-align: center; }

.footer-brand { font-weight: 800; font-size: 1rem; color: #fff; display: inline-flex; align-items: center; gap: 0.5rem; }
.footer-brand .brand-dot { background: var(--grad); }
.footer-copy { color: rgba(255,255,255,0.4); font-size: 0.83rem; }

.footer-nav { display: flex; gap: 1.75rem; flex-wrap: wrap; justify-content: center; }
.footer-nav a { color: rgba(255,255,255,0.55); font-size: 0.85rem; font-weight: 500; transition: var(--ease); }
.footer-nav a:hover { color: #fff; }

/* ── Scroll Top ── */
.scroll-top {
  position: fixed;
  bottom: 2rem; left: 2rem;
  width: 44px; height: 44px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text-2);
  font-size: 1.1rem;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  opacity: 0; visibility: hidden;
  transition: var(--ease);
  z-index: 999;
  box-shadow: var(--shadow-sm);
}
.scroll-top.visible { opacity: 1; visibility: visible; }
.scroll-top:hover {
  background: var(--grad);
  border-color: transparent;
  color: #fff;
  transform: translateY(-3px);
  box-shadow: var(--shadow-b);
}

/* ── Toast ── */
.toast {
  position: fixed;
  bottom: 2rem; right: 2rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 1rem 1.75rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-1);
  display: flex; align-items: center; gap: 0.75rem;
  box-shadow: var(--shadow-lg);
  transform: translateY(130%);
  opacity: 0;
  transition: all 0.4s ease;
  z-index: 9999;
}
.toast.show { transform: translateY(0); opacity: 1; }
.toast-icon { color: var(--green); font-size: 1.25rem; }

/* ── Reveal ── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ── Responsive ── */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; gap: 3rem; }
  .hero::after { display: none; }
  .hero-visual { order: -1; }
  .hero-desc { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-stack { justify-content: center; }
  .avatar-frame { width: 220px; height: 220px; }
  .avatar-orbit { width: 264px; height: 264px; }
  .about-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .section { padding: 5rem 0; }
  .nav-menu {
    position: fixed;
    top: 0; right: -100%;
    width: 280px; height: 100vh;
    background: rgba(255,255,255,0.25);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    flex-direction: column;
    align-items: flex-start;
    padding: 5rem 2rem 2rem;
    transition: right 0.35s ease;
    border-left: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    gap: 0.4rem;
    z-index: 5;
  }
  .nav-menu.open { right: 0; }
  .nav-toggle { display: flex; }
  .nav-link { width: 100%; border-radius: var(--r-sm); }
  .nav-cta { margin-left: 0; margin-top: 0.5rem; }
  .hero-title { font-size: 3rem; letter-spacing: -1.5px; }
  .form-row { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: repeat(auto-fill, minmax(118px, 1fr)); }
  .section-header { text-align: left; }
  .section-desc { margin-left: 0; }
  .divider { margin-left: 0; }
}

@media (max-width: 576px) {
  .hero-actions { flex-direction: column; }
  .hero-actions a { width: 100%; justify-content: center; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .hero-title { font-size: 2.6rem; }
  .section-header { text-align: left; }
}