/*
 * styles.css — Shared design system for Debabrata Dey's portfolio.
 *
 * Faithfully converted from the Stitch / Tailwind design tokens.
 * All 4 pages import this single file.
 *
 * Typography:  EB Garamond (headlines) + Hanken Grotesk (body)
 * Color theme: Warm off-white surface, deep forest-green primary
 */

/* =========================================================
   Google Fonts import
   ========================================================= */
@import url('https://fonts.googleapis.com/css2?family=EB+Garamond:ital,wght@0,400..800;1,400..800&family=Hanken+Grotesk:ital,wght@0,100..900;1,100..900&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:wght,FILL@100..700,0..1&display=swap');

/* =========================================================
   Design tokens (CSS custom properties)
   ========================================================= */
:root {
  /* --- Surfaces --- */
  --color-background:              #fcf9f8;
  --color-surface:                 #fcf9f8;
  --color-surface-bright:          #fcf9f8;
  --color-surface-dim:             #dcd9d9;
  --color-surface-container-lowest:#ffffff;
  --color-surface-container-low:   #f6f3f2;
  --color-surface-container:       #f0eded;
  --color-surface-container-high:  #eae7e7;
  --color-surface-container-highest:#e5e2e1;
  --color-surface-variant:         #e5e2e1;

  /* --- Primary (deep forest green) --- */
  --color-primary:                 #18241f;
  --color-on-primary:              #ffffff;
  --color-primary-container:       #2d3934;
  --color-on-primary-container:    #95a29c;
  --color-primary-fixed:           #d8e6de;
  --color-primary-fixed-dim:       #bccac2;
  --color-on-primary-fixed:        #121e19;
  --color-on-primary-fixed-variant:#3d4944;
  --color-inverse-primary:         #bccac2;

  /* --- Secondary --- */
  --color-secondary:               #5d5f5e;
  --color-on-secondary:            #ffffff;
  --color-secondary-container:     #dcdddc;
  --color-on-secondary-container:  #5f6161;
  --color-secondary-fixed:         #e2e2e2;
  --color-secondary-fixed-dim:     #c6c7c6;
  --color-on-secondary-fixed:      #1a1c1c;
  --color-on-secondary-fixed-variant:#454747;

  /* --- Tertiary (near-black) --- */
  --color-tertiary:                #20221f;
  --color-on-tertiary:             #ffffff;
  --color-tertiary-container:      #353734;
  --color-on-tertiary-container:   #9fa09c;
  --color-tertiary-fixed:          #e3e3df;
  --color-tertiary-fixed-dim:      #c6c7c3;
  --color-on-tertiary-fixed:       #1a1c1a;
  --color-on-tertiary-fixed-variant:#464744;

  /* --- On-surface / text --- */
  --color-on-surface:              #1c1b1b;
  --color-on-surface-variant:      #434845;
  --color-on-background:           #1c1b1b;
  --color-inverse-surface:         #313030;
  --color-inverse-on-surface:      #f3f0ef;

  /* --- Utility --- */
  --color-outline:                 #737875;
  --color-outline-variant:         #c3c8c4;
  --color-surface-tint:            #55615b;
  --color-error:                   #ba1a1a;
  --color-on-error:                #ffffff;
  --color-error-container:         #ffdad6;
  --color-on-error-container:      #93000a;

  /* --- Typography --- */
  --font-serif:   'EB Garamond', Georgia, serif;
  --font-sans:    'Hanken Grotesk', system-ui, sans-serif;

  /* --- Spacing --- */
  --spacing-unit:             8px;
  --spacing-gutter:           32px;
  --spacing-margin-mobile:    20px;
  --spacing-margin-desktop:   64px;
  --spacing-section-gap:      128px;
  --container-max:            1200px;

  /* --- Border radius --- */
  --radius-sm:   2px;
  --radius-md:   4px;
  --radius-lg:   8px;
  --radius-full: 12px;
}

/* =========================================================
   Reset & base
   ========================================================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  background-color: var(--color-background);
  color: var(--color-on-surface);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

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

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

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

/* =========================================================
   Typography scale
   ========================================================= */

/* Headline XL — 64px / lh 1.1 / ls -0.02em */
.text-headline-xl {
  font-family: var(--font-serif);
  font-size: 64px;
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 500;
}

/* Headline LG — 48px / lh 1.2 / ls -0.01em */
.text-headline-lg {
  font-family: var(--font-serif);
  font-size: 48px;
  line-height: 1.2;
  letter-spacing: -0.01em;
  font-weight: 500;
}

/* Headline MD — 32px / lh 1.3 */
.text-headline-md {
  font-family: var(--font-serif);
  font-size: 32px;
  line-height: 1.3;
  font-weight: 500;
}

/* Headline SM — 24px / lh 1.4 */
.text-headline-sm {
  font-family: var(--font-serif);
  font-size: 24px;
  line-height: 1.4;
  font-weight: 600;
}

/* Body LG — 18px / lh 1.6 */
.text-body-lg {
  font-family: var(--font-sans);
  font-size: 18px;
  line-height: 1.6;
  font-weight: 400;
}

/* Body MD — 16px / lh 1.6 */
.text-body-md {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  font-weight: 400;
}

/* Label CAPS — 12px / ls 0.1em / uppercase */
.text-label-caps {
  font-family: var(--font-sans);
  font-size: 12px;
  line-height: 1;
  letter-spacing: 0.1em;
  font-weight: 600;
  text-transform: uppercase;
}

/* Mobile headline overrides */
@media (max-width: 767px) {
  .text-headline-xl { font-size: 40px; line-height: 1.2; }
  .text-headline-lg { font-size: 32px; line-height: 1.2; }
}

/* =========================================================
   Layout helpers
   ========================================================= */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--spacing-margin-mobile);
}

@media (min-width: 768px) {
  .container { padding-inline: var(--spacing-margin-desktop); }
}

/* =========================================================
   Navigation
   ========================================================= */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-outline-variant);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--spacing-margin-mobile);
}

@media (min-width: 768px) {
  .nav-inner { padding-inline: var(--spacing-margin-desktop); }
}

.nav-logo {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--color-on-surface);
  transition: opacity 0.2s;
}
.nav-logo:hover { opacity: 0.8; }

.nav-links {
  display: none;
  gap: 32px;
  align-items: center;
}

@media (min-width: 768px) { .nav-links { display: flex; } }

.nav-links a {
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.1em;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--color-on-surface);
  opacity: 0.6;
  transition: opacity 0.2s;
}
.nav-links a:hover,
.nav-links a.active { opacity: 1; color: var(--color-primary); }

.nav-hire-btn {
  display: none;
}

@media (min-width: 768px) {
  .nav-hire-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-primary);
    color: var(--color-on-primary);
    font-family: var(--font-sans);
    font-size: 12px;
    letter-spacing: 0.1em;
    font-weight: 600;
    text-transform: uppercase;
    padding: 10px 24px;
    border-radius: var(--radius-md);
    transition: transform 0.2s;
  }
  .nav-hire-btn:hover { transform: translateY(-2px); }
}

.nav-menu-btn {
  display: flex;
  align-items: center;
  color: var(--color-on-surface);
}
@media (min-width: 768px) { .nav-menu-btn { display: none; } }

/* Mobile dropdown */
.nav-mobile {
  display: none;
  flex-direction: column;
  background: var(--color-surface-container-lowest);
  border-top: 1px solid var(--color-outline-variant);
  padding: 16px var(--spacing-margin-mobile);
  gap: 16px;
}
.nav-mobile.open { display: flex; }
.nav-mobile a {
  font-size: 12px;
  letter-spacing: 0.1em;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--color-on-surface);
  opacity: 0.7;
  transition: opacity 0.2s;
}
.nav-mobile a:hover { opacity: 1; }
.nav-mobile a.active { color: var(--color-primary); opacity: 1; }

/* =========================================================
   Buttons
   ========================================================= */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.1em;
  font-weight: 600;
  text-transform: uppercase;
  padding: 16px 32px;
  border-radius: var(--radius-md);
  transition: transform 0.2s;
  border: none;
  cursor: pointer;
}
.btn-primary:hover { transform: translateY(-2px); }
.btn-primary:active { transform: scale(0.97); }

.badge-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: var(--color-surface-container);
  color: var(--color-on-surface);
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.08em;
  font-weight: 600;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-outline-variant);
  transition: all 0.2s ease;
  text-decoration: none;
}

.badge-link:hover {
  background: var(--color-primary);
  color: var(--color-on-primary);
  border-color: var(--color-primary);
  transform: translateY(-1px);
}

.badge-link svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
  flex-shrink: 0;
}
.btn-outline:hover { transform: translateY(-2px); }

/* =========================================================
   Tags / badges
   ========================================================= */
.badge {
  display: inline-block;
  background-color: var(--color-tertiary);
  color: var(--color-on-tertiary);
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.1em;
  font-weight: 600;
  text-transform: uppercase;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
}

.badge-surface {
  background-color: var(--color-surface-container);
  color: var(--color-on-surface-variant);
}

/* =========================================================
   Footer
   ========================================================= */
.footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-outline-variant);
  margin-top: auto;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  padding: 48px var(--spacing-margin-mobile);
  max-width: var(--container-max);
  margin-inline: auto;
  text-align: center;
}

@media (min-width: 768px) {
  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    padding: 48px var(--spacing-margin-desktop);
    text-align: left;
    gap: 0;
  }
}

.footer-logo {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 600;
  color: var(--color-primary);
}

.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  font-size: 16px;
  color: var(--color-on-surface-variant);
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--color-primary); }

.footer-copy {
  font-size: 14px;
  color: var(--color-secondary);
}

/* =========================================================
   Material Symbols
   ========================================================= */
.material-symbols-outlined {
  font-family: 'Material Symbols Outlined';
  font-weight: normal;
  font-style: normal;
  font-size: 24px;
  line-height: 1;
  letter-spacing: normal;
  text-transform: none;
  display: inline-block;
  white-space: nowrap;
  direction: ltr;
  -webkit-font-smoothing: antialiased;
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
}

/* =========================================================
   Toast notifications
   ========================================================= */
.toast {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 9999;
  padding: 16px 24px;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 500;
  box-shadow: 0 8px 32px rgba(0,0,0,0.12);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.3s, transform 0.3s;
  pointer-events: none;
}
.toast.show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.toast.success {
  background: var(--color-primary);
  color: var(--color-on-primary);
}
.toast.error {
  background: var(--color-error-container);
  color: var(--color-on-error-container);
}

/* =========================================================
   Fade-in animation (scroll-triggered via JS)
   ========================================================= */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}