/* ==========================================================================
   ARGENTUM — design tokens
   ========================================================================== */

@font-face {
  font-family: "Montserrat";
  src: url("../fonts/montserrat-variable.woff2") format("woff2");
  font-weight: 500 800;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Inter";
  src: url("../fonts/inter-variable.woff2") format("woff2");
  font-weight: 400 600;
  font-style: normal;
  font-display: swap;
}

:root {
  /* colors */
  --color-bg: #0d0d0d;
  --color-bg-raised: #151515;
  --color-bg-card: #191919;
  --color-border: #2c2c2e;
  --color-border-strong: #3c3c3e;
  --color-text: #e4e4e2;
  --color-text-muted: #a8a8a6;
  --color-text-dim: #8a8a88;
  --color-silver: #c9c9c6;
  --color-silver-bright: #f2f2f0;
  --color-accent: #b9bdc4;
  --color-focus: #d6d8dc;

  /* type */
  --font-heading: "Montserrat", "Segoe UI", Arial, sans-serif;
  --font-body: "Inter", "Segoe UI", Arial, sans-serif;

  --fs-xs: 0.8125rem;
  --fs-sm: 0.9375rem;
  --fs-base: 1rem;
  --fs-md: 1.125rem;
  --fs-lg: 1.375rem;
  --fs-xl: 1.75rem;
  --fs-2xl: 2.25rem;
  --fs-3xl: 3rem;

  --lh-tight: 1.15;
  --lh-snug: 1.35;
  --lh-normal: 1.6;

  /* spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --max-width: 1200px;

  --transition-image: transform 300ms ease, filter 300ms ease;
}

/* ==========================================================================
   Reset
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

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

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1, h2, h3, h4, p {
  margin: 0;
}

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

table {
  border-collapse: collapse;
  width: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

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

.container {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-4);
  z-index: 200;
  background: var(--color-silver-bright);
  color: #0d0d0d;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: top 150ms ease;
}

.skip-link:focus {
  top: var(--space-4);
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--fs-sm);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  white-space: nowrap;
  transition: background-color 200ms ease, color 200ms ease, border-color 200ms ease, transform 150ms ease;
}

.btn-primary {
  background: var(--color-silver-bright);
  color: #0d0d0d;
  border: 1px solid var(--color-silver-bright);
}

.btn-primary:hover {
  background: var(--color-silver);
  border-color: var(--color-silver);
}

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

.btn-secondary:hover {
  border-color: var(--color-silver);
  color: var(--color-silver-bright);
}

.btn:active {
  transform: translateY(1px);
}

/* ==========================================================================
   Header
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 13, 13, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--fs-lg);
  letter-spacing: 0.08em;
  color: var(--color-silver-bright);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-7);
}

.nav-links {
  display: flex;
  gap: var(--space-6);
}

.nav-links a {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
  transition: color 200ms ease;
}

.nav-links a:hover {
  color: var(--color-silver-bright);
}

.header-cta {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-silver-bright);
  transition: transform 200ms ease, opacity 200ms ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ==========================================================================
   Sections general
   ========================================================================== */

section {
  scroll-margin-top: 96px;
}

.section {
  padding-block: var(--space-9);
  border-bottom: 1px solid var(--color-border);
}

.section-header {
  max-width: 640px;
  margin-bottom: var(--space-7);
}

.eyebrow {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-dim);
  margin-bottom: var(--space-3);
}

.section-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--fs-2xl);
  line-height: var(--lh-tight);
  color: var(--color-silver-bright);
}

.section-lede {
  margin-top: var(--space-4);
  font-size: var(--fs-md);
  color: var(--color-text-muted);
  line-height: var(--lh-snug);
}

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
  padding-block: var(--space-9) var(--space-8);
  border-bottom: 1px solid var(--color-border);
}

.hero .container {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: var(--space-8);
  align-items: center;
}

.hero-eyebrow {
  font-family: var(--font-heading);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-dim);
  margin-bottom: var(--space-4);
}

.hero-title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: var(--fs-3xl);
  line-height: var(--lh-tight);
  color: var(--color-silver-bright);
  letter-spacing: -0.01em;
}

.hero-subtitle {
  margin-top: var(--space-5);
  font-size: var(--fs-md);
  color: var(--color-text-muted);
  max-width: 46ch;
  line-height: var(--lh-snug);
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  margin-top: var(--space-7);
  flex-wrap: wrap;
}

.hero-media {
  position: relative;
}

.image-frame {
  background: #f4f4f2;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 1 / 1;
}

.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-image);
}

@media (hover: hover) {
  .image-frame:hover img,
  .hover-zoom:hover img {
    transform: scale(1.03);
    filter: brightness(1.05);
  }
}

@media (prefers-reduced-motion: reduce) {
  .image-frame img {
    transition: none;
  }
  .image-frame:hover img,
  .hover-zoom:hover img {
    transform: none;
    filter: none;
  }
}

/* ==========================================================================
   Finishes
   ========================================================================== */

.finishes-lede {
  max-width: 640px;
  color: var(--color-text-muted);
  font-size: var(--fs-md);
  margin-bottom: var(--space-7);
}

.finishes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.finish-card {
  text-align: center;
}

.finish-name {
  margin-top: var(--space-4);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--fs-md);
  color: var(--color-text);
  letter-spacing: 0.02em;
}

.finishes-cta {
  margin-top: var(--space-7);
  text-align: center;
}

/* ==========================================================================
   Features
   ========================================================================== */

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-5);
}

.feature-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6) var(--space-5);
}

.feature-icon {
  width: 44px;
  height: 44px;
  margin-bottom: var(--space-5);
  color: var(--color-silver);
}

.feature-icon svg {
  width: 100%;
  height: 100%;
}

.feature-title {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--fs-md);
  color: var(--color-silver-bright);
  margin-bottom: var(--space-3);
}

.feature-text {
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  line-height: var(--lh-normal);
}

/* ==========================================================================
   Specifications
   ========================================================================== */

.specs-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.specs-table {
  min-width: 480px;
}

.specs-table th,
.specs-table td {
  text-align: left;
  padding: var(--space-4) var(--space-5);
  font-size: var(--fs-sm);
  border-bottom: 1px solid var(--color-border);
}

.specs-table tr:last-child th,
.specs-table tr:last-child td {
  border-bottom: none;
}

.specs-table th {
  color: var(--color-text-dim);
  font-weight: 500;
  width: 40%;
  background: var(--color-bg-raised);
}

.specs-table td {
  color: var(--color-text);
  font-weight: 500;
}

/* ==========================================================================
   Gallery ("In detail")
   ========================================================================== */

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

.gallery-item .image-frame {
  aspect-ratio: 4 / 5;
  border-radius: var(--radius-md);
}

.gallery-caption {
  margin-top: var(--space-3);
  font-size: var(--fs-sm);
  color: var(--color-text-dim);
  transition: color 300ms ease;
}

@media (hover: hover) {
  .gallery-item:hover .gallery-caption {
    color: var(--color-silver-bright);
  }
}

/* ==========================================================================
   FAQ
   ========================================================================== */

.faq-list {
  max-width: 800px;
  border-top: 1px solid var(--color-border);
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  padding: var(--space-5) var(--space-2);
  text-align: left;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--fs-md);
  color: var(--color-text);
}

.faq-question:hover {
  color: var(--color-silver-bright);
}

.faq-icon {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  position: relative;
}

.faq-icon::before,
.faq-icon::after {
  content: "";
  position: absolute;
  background: var(--color-silver);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  transition: transform 250ms ease, opacity 250ms ease;
}

.faq-icon::before {
  width: 14px;
  height: 2px;
}

.faq-icon::after {
  width: 2px;
  height: 14px;
}

.faq-question[aria-expanded="true"] .faq-icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
  opacity: 0;
}

.faq-answer {
  overflow: hidden;
  max-height: 0;
  transition: max-height 300ms ease;
}

.faq-answer-inner {
  padding: 0 var(--space-2) var(--space-5);
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  line-height: var(--lh-normal);
  max-width: 68ch;
}

.faq-answer-inner a {
  color: var(--color-silver-bright);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ==========================================================================
   Why ARGENTUM
   ========================================================================== */

.why-content {
  max-width: 760px;
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.why-content p {
  font-size: var(--fs-md);
  color: var(--color-text-muted);
  line-height: var(--lh-snug);
}

.why-content p:first-child {
  color: var(--color-text);
  font-size: var(--fs-lg);
  font-family: var(--font-heading);
  font-weight: 500;
  line-height: var(--lh-snug);
}

/* ==========================================================================
   Closing CTA
   ========================================================================== */

.closing-cta {
  text-align: center;
  padding-block: var(--space-9);
}

.closing-cta .section-title {
  margin-bottom: var(--space-6);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  padding-block: var(--space-8) var(--space-7);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--space-7);
  padding-bottom: var(--space-7);
  border-bottom: 1px solid var(--color-border);
}

.footer-brand .logo {
  display: block;
  margin-bottom: var(--space-3);
}

.footer-brand p {
  color: var(--color-text-dim);
  font-size: var(--fs-sm);
  line-height: var(--lh-normal);
}

.footer-heading {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--fs-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-dim);
  margin-bottom: var(--space-4);
}

.footer-links li {
  margin-bottom: var(--space-3);
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  transition: color 200ms ease;
}

.footer-links a:hover {
  color: var(--color-silver-bright);
}

.footer-bottom {
  padding-top: var(--space-6);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-5);
  flex-wrap: wrap;
}

.footer-copy {
  font-size: var(--fs-xs);
  color: var(--color-text-dim);
}

.footer-disclaimer {
  font-size: var(--fs-xs);
  color: var(--color-text-dim);
  max-width: 46ch;
  line-height: var(--lh-normal);
}

/* ==========================================================================
   Internal pages (legal)
   ========================================================================== */

.legal-main {
  padding-block: var(--space-8) var(--space-9);
}

.legal-header {
  max-width: 720px;
  margin-bottom: var(--space-7);
}

.legal-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--fs-2xl);
  color: var(--color-silver-bright);
}

.legal-updated {
  margin-top: var(--space-3);
  color: var(--color-text-dim);
  font-size: var(--fs-sm);
}

.legal-body {
  max-width: 720px;
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.legal-body p {
  color: var(--color-text-muted);
  font-size: var(--fs-md);
  line-height: var(--lh-normal);
}

.legal-body a {
  color: var(--color-silver-bright);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 960px) {
  .hero .container {
    grid-template-columns: 1fr;
  }

  .hero-media {
    order: -1;
    max-width: 420px;
    margin-inline: auto;
    width: 100%;
  }

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

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

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 760px) {
  .main-nav {
    position: fixed;
    inset: 76px 0 0 0;
    height: calc(100vh - 76px);
    background: var(--color-bg);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    padding: var(--space-6) var(--space-5);
    gap: var(--space-6);
    transform: translateX(100%);
    transition: transform 250ms ease;
    overflow-y: auto;
  }

  .main-nav.is-open {
    transform: translateX(0);
  }

  .nav-links {
    flex-direction: column;
    gap: var(--space-5);
  }

  .nav-links a {
    font-size: var(--fs-lg);
  }

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

  .header-cta .btn {
    width: 100%;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-title {
    font-size: var(--fs-2xl);
  }

  .finishes-grid {
    grid-template-columns: 1fr;
    max-width: 360px;
    margin-inline: auto;
  }

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

  .gallery-grid {
    grid-template-columns: 1fr;
    max-width: 420px;
    margin-inline: auto;
  }

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

  .footer-bottom {
    flex-direction: column;
  }

  .section {
    padding-block: var(--space-8);
  }
}

@media (max-width: 620px) {
  .gallery-grid {
    grid-template-columns: 1fr;
  }
}