/* =============================================
   THERMA — Heating Design Studio
   Aesthetic: Refined industrial warmth
   Palette: Deep charcoal + ember tones
   Fonts: Cormorant Garamond + DM Mono
   ============================================= */

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

:root {
  --coal:     #0f0e0c;
  --ash:      #1c1a17;
  --stone:    #2e2b26;
  --warm:     #5a4e3c;
  --amber:    #c87941;
  --ember:    #e05c2a;
  --cream:    #f4ede2;
  --ivory:    #faf7f2;
  --muted:    #9c8e7e;
  --border:   rgba(200,121,65,0.18);
  --ff-serif: 'Cormorant Garamond', Georgia, serif;
  --ff-mono:  'DM Mono', 'Courier New', monospace;
  --ease:     cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  background: var(--coal);
  color: var(--cream);
  font-family: var(--ff-serif);
  line-height: 1.7;
  overflow-x: hidden;
}

/* =============================================
   SCROLLBAR
   ============================================= */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--coal); }
::-webkit-scrollbar-thumb { background: var(--amber); border-radius: 2px; }

/* =============================================
   NAV
   ============================================= */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 2rem 4rem;
  transition: padding 0.4s var(--ease), background 0.4s var(--ease), box-shadow 0.4s var(--ease);
}

.nav--scrolled {
  padding: 1.1rem 4rem;
  background: rgba(15,14,12,0.92);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--border);
}

.nav__logo {
  font-family: var(--ff-mono);
  font-size: 1rem;
  letter-spacing: 0.35em;
  color: var(--amber);
  font-weight: 400;
}

.nav__links {
  display: flex;
  list-style: none;
  gap: 3rem;
}

.nav__link {
  font-family: var(--ff-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  position: relative;
  transition: color 0.3s;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -3px; left: 0;
  width: 0; height: 1px;
  background: var(--amber);
  transition: width 0.35s var(--ease);
}

.nav__link:hover { color: var(--cream); }
.nav__link:hover::after { width: 100%; }

/* =============================================
   HERO
   ============================================= */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding: 10rem 4rem 6rem;
  position: relative;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 60% at 75% 55%, rgba(224,92,42,0.12) 0%, transparent 70%),
              radial-gradient(ellipse 50% 40% at 80% 70%, rgba(200,121,65,0.08) 0%, transparent 60%),
              var(--coal);
}

/* Animated heat shimmer rings */
.hero__heat {
  position: absolute;
  border-radius: 50%;
  border: 1px solid;
  opacity: 0;
  animation: heatRise 6s var(--ease) infinite;
}

.heat--1 {
  width: 400px; height: 400px;
  right: 8%; top: 20%;
  border-color: rgba(224,92,42,0.15);
  animation-delay: 0s;
}
.heat--2 {
  width: 600px; height: 600px;
  right: 3%; top: 5%;
  border-color: rgba(200,121,65,0.1);
  animation-delay: 1.5s;
}
.heat--3 {
  width: 800px; height: 800px;
  right: -5%; top: -10%;
  border-color: rgba(200,121,65,0.06);
  animation-delay: 3s;
}

@keyframes heatRise {
  0%   { opacity: 0; transform: scale(0.92); }
  30%  { opacity: 1; }
  100% { opacity: 0; transform: scale(1.12); }
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: 680px;
  animation: fadeUp 1s var(--ease) both;
}

.hero__eyebrow {
  display: block;
  font-family: var(--ff-mono);
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 1.8rem;
}

.hero__title {
  font-size: clamp(3.5rem, 7vw, 7rem);
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--ivory);
  margin-bottom: 2rem;
}

.hero__title em {
  font-style: italic;
  color: var(--amber);
}

.hero__sub {
  font-size: 1.15rem;
  color: var(--muted);
  font-weight: 300;
  margin-bottom: 3rem;
  line-height: 1.8;
}

/* =============================================
   SCROLL INDICATOR
   ============================================= */
.hero__scroll {
  position: absolute;
  bottom: 3rem;
  left: 4rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  z-index: 2;
}

.hero__scroll span {
  font-family: var(--ff-mono);
  font-size: 0.65rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--muted);
  transform: rotate(-90deg);
}

.hero__scroll-line {
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, var(--amber), transparent);
  animation: scrollLine 2s var(--ease) infinite;
}

@keyframes scrollLine {
  0%   { transform: scaleY(0); transform-origin: top; }
  50%  { transform: scaleY(1); transform-origin: top; }
  51%  { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* =============================================
   BUTTONS
   ============================================= */
.btn {
  display: inline-block;
  font-family: var(--ff-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--coal);
  background: var(--amber);
  padding: 1rem 2.2rem;
  text-decoration: none;
  border: 1px solid var(--amber);
  cursor: pointer;
  transition: background 0.3s, color 0.3s, transform 0.2s;
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--ember);
  transform: translateX(-101%);
  transition: transform 0.35s var(--ease);
  z-index: 0;
}

.btn:hover { color: var(--ivory); }
.btn:hover::after { transform: translateX(0); }
.btn span, .btn { position: relative; z-index: 1; }

.btn--outline {
  background: transparent;
  color: var(--cream);
  border-color: var(--border);
}
.btn--outline::after { background: var(--amber); }
.btn--outline:hover { color: var(--coal); }

.btn--full { width: 100%; text-align: center; }

/* =============================================
   SECTIONS — shared
   ============================================= */
.section {
  padding: 8rem 4rem;
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.section.visible {
  opacity: 1;
  transform: translateY(0);
}

.section__label {
  font-family: var(--ff-mono);
  font-size: 0.65rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 3.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.section__label::after {
  content: '';
  display: block;
  width: 60px;
  height: 1px;
  background: var(--border);
}

.section__title {
  font-size: clamp(2.5rem, 4.5vw, 4rem);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--ivory);
  margin-bottom: 2.5rem;
}

.section__title em {
  font-style: italic;
  color: var(--amber);
}

/* =============================================
   ABOUT
   ============================================= */
.about { background: var(--ash); }

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 6rem;
  align-items: center;
  max-width: 1200px;
}

.about__visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 420px;
}

.about__ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid var(--border);
  animation: pulse 4s ease-in-out infinite;
}

.ring--outer {
  width: 360px; height: 360px;
  animation-delay: 0s;
}

.ring--inner {
  width: 240px; height: 240px;
  border-color: rgba(200,121,65,0.3);
  animation-delay: 1.2s;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.6; }
  50%       { transform: scale(1.04); opacity: 1; }
}

.about__icon {
  font-size: 4rem;
  color: var(--amber);
  position: relative;
  z-index: 2;
  line-height: 1;
  animation: glow 3s ease-in-out infinite;
}

@keyframes glow {
  0%, 100% { text-shadow: 0 0 20px rgba(224,92,42,0.3); }
  50%       { text-shadow: 0 0 50px rgba(224,92,42,0.7), 0 0 80px rgba(224,92,42,0.3); }
}

.about__stat {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
}

.stat__num {
  display: block;
  font-size: 3.5rem;
  font-weight: 300;
  color: var(--ivory);
  line-height: 1;
}

.stat__desc {
  font-family: var(--ff-mono);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.about__text p {
  color: var(--muted);
  font-size: 1.1rem;
  margin-bottom: 1.4rem;
}

.about__pillars {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 3rem;
}

.pillar {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.4rem;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease), border-color 0.3s;
  transition-delay: calc(var(--i, 0) * 0.1s);
}

.pillar.visible {
  opacity: 1;
  transform: translateY(0);
}

.pillar:hover { border-color: rgba(200,121,65,0.45); }

.pillar__num {
  font-family: var(--ff-mono);
  font-size: 0.65rem;
  color: var(--amber);
  letter-spacing: 0.1em;
  flex-shrink: 0;
  padding-top: 0.1rem;
}

.pillar__text {
  font-size: 0.95rem;
  color: var(--cream);
  line-height: 1.5;
}

/* =============================================
   REFERENCES
   ============================================= */
.references { background: var(--coal); }

.references__title { max-width: 600px; }

.ref__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5px;
  background: var(--border);
  border: 1px solid var(--border);
}

.ref__card {
  background: var(--ash);
  display: flex;
  flex-direction: column;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
  position: relative;
  overflow: hidden;
}

.ref__card.visible {
  opacity: 1;
  transform: translateY(0);
}

.ref__card:hover .ref__glow {
  opacity: 0.35;
  transform: scale(1.2);
}

.ref__card-top {
  height: 140px;
  background: var(--stone);
  position: relative;
  overflow: hidden;
}
.ref__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s var(--ease), filter 0.6s var(--ease);
  filter: brightness(0.82) saturate(0.85);
}

.ref__glow {
  position: absolute;
  width: 200px; height: 200px;
  border-radius: 50%;
  bottom: -60px; right: -40px;
  opacity: 0.18;
  filter: blur(40px);
  transition: opacity 0.5s, transform 0.5s;
}

.glow--amber { background: var(--amber); }
.glow--red   { background: var(--ember); }
.glow--orange{ background: #d4622f; }

.ref__card-body {
  padding: 1.8rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.ref__tag {
  font-family: var(--ff-mono);
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 0.8rem;
  display: block;
}

.ref__name {
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--ivory);
  margin-bottom: 0.4rem;
  line-height: 1.25;
}

.ref__location {
  font-family: var(--ff-mono);
  font-size: 0.62rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
}

.ref__desc {
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.65;
  flex: 1;
}

.ref__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.ref__meta span {
  font-family: var(--ff-mono);
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  border: 1px solid var(--border);
  padding: 0.3rem 0.7rem;
}

/* CTA card */
.ref__card--cta {
  background: var(--stone);
  justify-content: center;
  align-items: center;
  padding: 3rem;
}

.ref__card-cta-inner {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.2rem;
}

.ref__cta-num {
  font-size: 4.5rem;
  font-weight: 300;
  color: var(--amber);
  line-height: 1;
}

.ref__cta-text {
  font-size: 1rem;
  color: var(--muted);
  max-width: 180px;
  line-height: 1.5;
}

/* data-num badge */
.ref__card::before {
  content: attr(data-num);
  position: absolute;
  top: 1rem;
  left: 1.4rem;
  font-family: var(--ff-mono);
  font-size: 0.6rem;
  color: rgba(200,121,65,0.5);
  letter-spacing: 0.15em;
}

/* =============================================
   CONTACT
   ============================================= */
.contact {
  background: var(--ash);
  border-top: 1px solid var(--border);
}

.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 6rem;
  align-items: start;
  max-width: 1200px;
}

.contact__intro {
  color: var(--muted);
  font-size: 1.1rem;
  margin-bottom: 3rem;
}

.contact__details {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.contact__item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
  opacity: 0;
  transform: translateX(-20px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

.contact__item.visible {
  opacity: 1;
  transform: translateX(0);
}

.contact__label {
  font-family: var(--ff-mono);
  font-size: 0.62rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--amber);
}

.contact__value {
  font-size: 1.05rem;
  color: var(--cream);
  line-height: 1.6;
}

/* FORM */
.contact__form-wrap {
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
}

.form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.4rem;
}

.form__group {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.form__label {
  font-family: var(--ff-mono);
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.form__input {
  background: var(--stone);
  border: 1px solid var(--border);
  color: var(--cream);
  font-family: var(--ff-serif);
  font-size: 1rem;
  padding: 0.85rem 1rem;
  outline: none;
  transition: border-color 0.3s, background 0.3s;
  -webkit-appearance: none;
  appearance: none;
}

.form__input:focus {
  border-color: var(--amber);
  background: rgba(200,121,65,0.05);
}

.form__input::placeholder { color: var(--warm); }

.form__select {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23c87941' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

.form__select option { background: var(--ash); color: var(--cream); }

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

.form__confirm {
  font-family: var(--ff-mono);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  color: var(--amber);
  text-align: center;
  opacity: 0;
  transition: opacity 0.5s;
  padding: 0.5rem;
}

.form__confirm.visible { opacity: 1; }

/* =============================================
   FOOTER
   ============================================= */
.footer {
  background: var(--coal);
  border-top: 1px solid var(--border);
  padding: 2.5rem 4rem;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.footer__logo {
  font-family: var(--ff-mono);
  font-size: 0.85rem;
  letter-spacing: 0.35em;
  color: var(--amber);
}

.footer__copy {
  font-family: var(--ff-mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  color: var(--warm);
}

.footer__links {
  display: flex;
  gap: 2rem;
}

.footer__links a {
  font-family: var(--ff-mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.3s;
}

.footer__links a:hover { color: var(--amber); }

/* =============================================
   ANIMATIONS
   ============================================= */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 1024px) {
  .nav { padding: 1.5rem 2.5rem; }
  .nav--scrolled { padding: 1rem 2.5rem; }
  .hero { padding: 9rem 2.5rem 5rem; }
  .section { padding: 6rem 2.5rem; }
  .about__grid { grid-template-columns: 1fr; gap: 3.5rem; }
  .about__visual { height: 300px; }
  .ref__grid { grid-template-columns: 1fr 1fr; }
  .contact__grid { grid-template-columns: 1fr; gap: 3rem; }
  .footer { padding: 2rem 2.5rem; }
}

@media (max-width: 680px) {
  .nav__links { gap: 1.5rem; }
  .nav { padding: 1.2rem 1.5rem; }
  .nav--scrolled { padding: 0.9rem 1.5rem; }
  .hero { padding: 8rem 1.5rem 5rem; }
  .hero__scroll { left: 1.5rem; }
  .section { padding: 5rem 1.5rem; }
  .ref__grid { grid-template-columns: 1fr; }
  .form__row { grid-template-columns: 1fr; }
  .footer__inner { flex-direction: column; text-align: center; }
  .about__pillars { grid-template-columns: 1fr; }
  .footer { padding: 2rem 1.5rem; }
}

/* =============================================
   LANGUAGE SWITCHER
   ============================================= */
.lang-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  border: 1px solid var(--border);
  padding: 0.45rem 0.85rem;
  cursor: pointer;
  transition: border-color 0.3s, background 0.3s;
  flex-shrink: 0;
}

.lang-btn:hover {
  border-color: var(--amber);
  background: rgba(200,121,65,0.08);
}

.lang-btn__flag {
  width: 28px;
  height: 18px;
  display: inline-block;
  border-radius: 2px;
  overflow: hidden;
  flex-shrink: 0;
  box-shadow: 0 0 0 1px rgba(255,255,255,0.12);
}

.lang-btn__label {
  font-family: var(--ff-mono);
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  color: var(--muted);
  transition: color 0.3s;
}

.lang-btn:hover .lang-btn__label {
  color: var(--cream);
}