/* ============================================================
   cs.css — Shared stylesheet for all case study pages
   Sudheer Kunchala Portfolio · 2026
   ============================================================ */

/* ─── Google Fonts are linked in HTML ─── */

/* ─── CSS Reset + Root Variables ─── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --fh: 'Chakra Petch', sans-serif;
  --fm: 'Share Tech Mono', monospace;
  --fb: 'Crimson Pro', serif;

  --void:    #030811;
  --deep:    #070f1e;
  --surface: #0c1a2e;
  --surf2:   #0f2040;
  --brd:     rgba(12,238,196,.12);
  --brd-hi:  rgba(12,238,196,.35);
  --a:       #0ceec4;
  --b:       #ff2d6e;
  --c:       #ffd166;
  --txt:     #bcd4e0;
  --txt-dim: rgba(188,212,224,.45);
  --txt-hi:  #e8f4f8;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--void);
  color: var(--txt);
  font-family: var(--fb);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  cursor: none;
}

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

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

ul {
  list-style: none;
}

/* ─── Custom Cursor ─── */
#cur {
  position: fixed;
  top: 0;
  left: 0;
  width: 6px;
  height: 6px;
  background: var(--a);
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 8px var(--a), 0 0 20px rgba(12,238,196,.4);
  transition: width .18s, height .18s, border-color .18s;
}

#cur-ring {
  position: fixed;
  top: 0;
  left: 0;
  width: 32px;
  height: 32px;
  border: 1px solid rgba(12,238,196,.45);
  border-radius: 50%;
  pointer-events: none;
  z-index: 9998;
  transform: translate(-50%, -50%);
  transition: width .18s, height .18s, border-color .18s;
}

/* ─── Scanlines ─── */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    rgba(0,0,0,.06) 0px,
    rgba(0,0,0,.06) 1px,
    transparent 1px,
    transparent 4px
  );
  z-index: 1000;
  pointer-events: none;
  mix-blend-mode: darken;
}

/* ─── Navigation ─── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 500;
  padding: 22px 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  background: linear-gradient(to bottom, var(--void), transparent);
}

.n-logo {
  font-family: var(--fm);
  font-size: 12px;
  color: var(--a);
  letter-spacing: .18em;
  text-decoration: none;
}

.n-links {
  display: flex;
  align-items: center;
  gap: 44px;
}

.n-links a {
  font-family: var(--fm);
  font-size: 10px;
  color: var(--txt-dim);
  letter-spacing: .28em;
  text-transform: uppercase;
  text-decoration: none;
  transition: color .2s;
}

.n-links a:hover {
  color: var(--a);
}

.n {
  color: var(--a);
}

.n-back {
  font-family: var(--fm);
  font-size: 10px;
  color: var(--a);
  letter-spacing: .22em;
  text-transform: uppercase;
  text-decoration: none;
  transition: opacity .2s;
}

.n-back:hover {
  opacity: .7;
}

/* ─── Keyframes ─── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(26px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes grid-move {
  from { background-position: 0 0; }
  to   { background-position: 0 64px; }
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 8px var(--a), 0 0 20px rgba(12,238,196,.4); }
  50%       { box-shadow: 0 0 16px var(--a), 0 0 40px rgba(12,238,196,.7), 0 0 60px rgba(12,238,196,.3); }
}

@keyframes scrollanim {
  0%   { transform: scaleY(0); transform-origin: top; }
  45%  { transform: scaleY(1); transform-origin: top; }
  55%  { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

@keyframes spin {
  from { transform: translate(-50%,-50%) rotate(0deg); }
  to   { transform: translate(-50%,-50%) rotate(360deg); }
}

/* ─── Scroll Reveal ─── */
.rev {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity .85s, transform .85s;
}

.rev.vis {
  opacity: 1;
  transform: none;
}

.d1 { transition-delay: .1s; }
.d2 { transition-delay: .2s; }
.d3 { transition-delay: .3s; }
.d4 { transition-delay: .4s; }

/* ─── HUD Brackets ─── */
.hud-tl,
.hud-tr,
.hud-bl,
.hud-br {
  position: absolute;
  width: 20px;
  height: 20px;
}

.hud-tl {
  top: 0;
  left: 0;
  border-top: 1px solid var(--a);
  border-left: 1px solid var(--a);
}

.hud-tr {
  top: 0;
  right: 0;
  border-top: 1px solid var(--a);
  border-right: 1px solid var(--a);
}

.hud-bl {
  bottom: 0;
  left: 0;
  border-bottom: 1px solid var(--a);
  border-left: 1px solid var(--a);
}

.hud-br {
  bottom: 0;
  right: 0;
  border-bottom: 1px solid var(--a);
  border-right: 1px solid var(--a);
}

/* ─── Animated Grid ─── */
.h-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(12,238,196,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(12,238,196,.04) 1px, transparent 1px);
  background-size: 64px 64px;
  animation: grid-move 22s linear infinite;
  pointer-events: none;
}

/* ─── Glow ─── */
.h-glow {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at -10% 50%, rgba(12,238,196,.12), transparent 55%),
    radial-gradient(ellipse at 95% 20%, rgba(255,45,110,.08), transparent 55%);
  pointer-events: none;
}

/* ─── Process Section ─── */
.proc-wrap {
  background: var(--deep);
}

.proc-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
}

.proc-step {
  background: var(--void);
  padding: 44px 32px;
  position: relative;
  overflow: hidden;
  transition: background .3s;
}

.proc-step:hover {
  background: var(--surface);
}

.proc-step::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--brd);
  transition: background .4s;
}

.proc-step:hover::before {
  background: linear-gradient(90deg, var(--a), var(--b));
}

.p-num {
  font-family: var(--fm);
  font-size: 52px;
  color: var(--surf2);
  display: block;
  margin-bottom: 20px;
  line-height: 1;
}

.p-title {
  font-family: var(--fh);
  font-size: 17px;
  font-weight: 600;
  color: var(--txt-hi);
  margin-bottom: 10px;
}

.p-desc {
  font-family: var(--fb);
  font-size: 15px;
  color: var(--txt-dim);
  line-height: 1.7;
  font-style: italic;
}

/* ─── Footer ─── */
footer {
  border-top: 1px solid var(--brd);
  padding: 28px 64px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.ft-l {
  font-family: var(--fm);
  font-size: 9px;
  color: var(--txt-dim);
  letter-spacing: .22em;
  text-transform: uppercase;
}

.ft-r {
  font-family: var(--fm);
  font-size: 9px;
  color: var(--brd-hi);
  letter-spacing: .14em;
  text-transform: uppercase;
}

/* ============================================================
   CASE STUDY SPECIFIC STYLES
   ============================================================ */

/* ─── CS Hero ─── */
.cs-hero {
  position: relative;
  min-height: 65vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 140px 64px 80px;
  overflow: hidden;
}

/* ─── Breadcrumb ─── */
.cs-crumb {
  position: absolute;
  top: 80px;
  left: 64px;
  font-family: var(--fm);
  font-size: 10px;
  letter-spacing: .25em;
  color: var(--txt-dim);
  z-index: 1;
}

.cs-crumb a {
  color: var(--a);
  text-decoration: none;
  transition: opacity .2s;
}

.cs-crumb a:hover {
  opacity: .7;
}

.cs-crumb .sep {
  margin: 0 10px;
  color: var(--brd-hi);
}

/* ─── Hero Bottom Content ─── */
.cs-hero-bottom {
  position: relative;
  z-index: 1;
}

.cs-proj-num {
  display: block;
  font-family: var(--fm);
  font-size: 10px;
  color: var(--b);
  letter-spacing: .3em;
  margin-bottom: 20px;
  text-transform: uppercase;
}

.cs-proj-tag {
  display: inline-block;
  font-family: var(--fm);
  font-size: 9px;
  color: var(--a);
  text-transform: uppercase;
  border: 1px solid var(--brd-hi);
  padding: 4px 14px;
  margin-bottom: 32px;
  letter-spacing: .2em;
}

.cs-title {
  font-family: var(--fh);
  font-size: clamp(38px, 5.5vw, 76px);
  font-weight: 700;
  color: var(--txt-hi);
  line-height: .95;
  letter-spacing: -.03em;
  margin-bottom: 40px;
}

.cs-hero-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0;
}

.cs-meta-item {
  font-family: var(--fm);
  font-size: 10px;
  color: var(--txt-dim);
  letter-spacing: .2em;
  text-transform: uppercase;
  padding-right: 24px;
  margin-right: 24px;
  border-right: 1px solid var(--brd);
}

.cs-meta-item:last-child {
  border-right: none;
  padding-right: 0;
  margin-right: 0;
}

.cs-meta-item b {
  color: var(--txt);
  display: block;
  margin-top: 4px;
  font-weight: 400;
  font-family: var(--fm);
  font-size: 10px;
  letter-spacing: .12em;
}

/* ─── Overview Bar ─── */
.ov-bar {
  background: var(--deep);
  border-top: 1px solid var(--brd);
  border-bottom: 1px solid var(--brd);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.ov-item {
  padding: 28px 48px;
  border-right: 1px solid var(--brd);
}

.ov-item:last-child {
  border-right: none;
}

.ov-label {
  font-family: var(--fm);
  font-size: 9px;
  color: var(--b);
  letter-spacing: .28em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 8px;
}

.ov-val {
  font-family: var(--fh);
  font-size: 16px;
  font-weight: 500;
  color: var(--txt-hi);
}

/* ─── Content Wrap ─── */
.cs-wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 100px 64px;
}

/* ─── Section Header ─── */
.cs-sec-hd {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 56px;
}

.cs-sec-n {
  font-family: var(--fm);
  font-size: 10px;
  color: var(--b);
  letter-spacing: .22em;
  text-transform: uppercase;
  white-space: nowrap;
}

.cs-sec-t {
  font-family: var(--fh);
  font-size: clamp(26px, 3.2vw, 42px);
  font-weight: 600;
  color: var(--txt-hi);
  letter-spacing: -.02em;
  white-space: nowrap;
}

.cs-sec-ln {
  flex: 1;
  height: 1px;
  background: var(--brd);
}

/* ─── Body Text ─── */
.cs-body {
  font-family: var(--fb);
  font-size: 19px;
  color: var(--txt);
  line-height: 1.88;
}

.cs-body em {
  color: var(--a);
  font-style: italic;
}

.cs-body + .cs-body {
  margin-top: 24px;
}

.ph {
  color: var(--txt-dim);
  font-style: italic;
}

/* ─── Callout Block ─── */
.cs-callout {
  background: var(--deep);
  border-left: 2px solid var(--a);
  padding: 32px 40px;
  margin: 40px 0;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

.cs-callout-text {
  font-family: var(--fb);
  font-size: 22px;
  color: var(--txt-hi);
  line-height: 1.6;
  font-style: italic;
}

.cs-callout-attr {
  font-family: var(--fm);
  font-size: 10px;
  color: var(--a);
  letter-spacing: .2em;
  margin-top: 16px;
  display: block;
}

/* ─── Two Column / Three Column ─── */
.cs-2col {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 64px;
  align-items: start;
}

.cs-3col {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
}

/* ─── Insight Cards ─── */
.insight-card {
  background: var(--deep);
  padding: 36px 32px;
}

.insight-num {
  font-family: var(--fm);
  font-size: 28px;
  color: var(--surf2);
  display: block;
  margin-bottom: 12px;
  line-height: 1;
}

.insight-title {
  font-family: var(--fh);
  font-size: 15px;
  font-weight: 600;
  color: var(--a);
  margin-bottom: 8px;
}

.insight-body {
  font-family: var(--fb);
  font-size: 14px;
  color: var(--txt-dim);
  font-style: italic;
  line-height: 1.65;
}

/* ─── Metric Box ─── */
.cs-metric-box {
  background: var(--deep);
  padding: 48px 40px;
  text-align: center;
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
}

.big-num {
  font-family: var(--fh);
  font-size: clamp(48px, 7vw, 88px);
  font-weight: 700;
  color: var(--a);
  display: block;
  letter-spacing: -.04em;
  line-height: 1;
}

.big-label {
  font-family: var(--fm);
  font-size: 9px;
  color: var(--txt-dim);
  text-transform: uppercase;
  letter-spacing: .28em;
  margin-top: 12px;
  display: block;
}

/* ─── Screen Placeholder ─── */
.cs-screen {
  background: var(--deep);
  position: relative;
  overflow: hidden;
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.cs-screen.r169 {
  aspect-ratio: 16 / 9;
}

.cs-screen.r43 {
  aspect-ratio: 4 / 3;
}

.cs-screen.r32 {
  aspect-ratio: 3 / 2;
}

.cs-screen img {
  max-width: 95%;
  max-height: 95%;
  width: auto;
  height: auto;
  object-fit: contain;
  position: relative;
  z-index: 10;
  mix-blend-mode: normal;
}

/* Hide scanlines and effects for UI design images */
img[alt*="Screen"], img[alt*="Dashboard"], img[alt*="Journey"], img[alt*="Flow"] {
  filter: none;
  mix-blend-mode: normal;
  z-index: 1001;
  position: relative;
}

/* Ensure all images in case studies don't have scanlines */
.cs-screen img,
[style*="display: block"] img {
  z-index: 1001;
  position: relative;
  background: var(--deep);
}

.cs-screen-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 30% 50%, rgba(12,238,196,.07), transparent 55%),
    repeating-linear-gradient(
      -45deg,
      transparent,
      transparent 20px,
      rgba(12,238,196,.03) 20px,
      rgba(12,238,196,.03) 21px
    );
}

.cs-screen-lbl {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--fm);
  font-size: 10px;
  letter-spacing: .28em;
  color: rgba(12,238,196,.3);
  text-align: center;
}

/* ─── Screen Grids ─── */
.cs-sg-1 {
  display: grid;
  gap: 2px;
}

.cs-sg-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
}

.cs-sg-3 {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2px;
}

.cs-screen-cap {
  font-family: var(--fm);
  font-size: 9px;
  color: var(--txt-dim);
  letter-spacing: .2em;
  margin-top: 12px;
  text-transform: uppercase;
}

/* ─── Outcomes ─── */
.cs-outcomes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
}

.outcome-item {
  background: var(--deep);
  padding: 48px 40px;
  text-align: center;
  transition: background .3s;
}

.outcome-item:hover {
  background: var(--surface);
}

/* ─── Project Nav ─── */
.cs-project-nav {
  border-top: 1px solid var(--brd);
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.cs-nav-link {
  background: var(--deep);
  padding: 48px 60px;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: background .3s;
  cursor: none;
}

.cs-nav-link:hover {
  background: var(--surface);
}

.cs-nav-link.next {
  border-left: 1px solid var(--brd);
  text-align: right;
  align-items: flex-end;
}

.cs-nav-dir {
  font-family: var(--fm);
  font-size: 9px;
  color: var(--txt-dim);
  text-transform: uppercase;
  letter-spacing: .28em;
}

.cs-nav-name {
  font-family: var(--fh);
  font-size: clamp(18px, 2.5vw, 28px);
  font-weight: 600;
  color: var(--txt-hi);
}

.cs-nav-tag {
  font-family: var(--fm);
  font-size: 9px;
  color: var(--a);
  letter-spacing: .2em;
}

/* ─── Screens Section Background ─── */
.cs-screens-section {
  background: var(--surface);
  padding: 100px 0;
}

.cs-screens-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 64px;
}

/* ─── Screen stack spacing ─── */
.cs-sg-1 + .cs-sg-2,
.cs-sg-1 + .cs-sg-3 {
  margin-top: 2px;
}

/* ─── Hamburger Button ─── */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: 1px solid var(--brd-hi);
  cursor: none;
  padding: 8px 10px;
  z-index: 601;
  flex-shrink: 0;
}
.nav-hamburger span {
  display: block;
  width: 20px;
  height: 1px;
  background: var(--a);
  transition: transform .3s, opacity .3s;
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ─── Responsive ─── */
@media (max-width: 960px) {
  nav {
    padding: 16px 24px;
  }

  .cs-hero {
    padding: 0 24px 60px;
  }

  .cs-crumb {
    top: 80px;
    left: 24px;
  }

  .cs-wrap {
    padding: 80px 24px;
  }

  .ov-bar {
    grid-template-columns: 1fr 1fr;
  }

  .cs-2col {
    grid-template-columns: 1fr;
  }

  .cs-3col {
    grid-template-columns: 1fr;
  }

  .cs-outcomes {
    grid-template-columns: 1fr 1fr;
  }

  .cs-sg-2 {
    grid-template-columns: 1fr;
  }

  .cs-sg-3 {
    grid-template-columns: 1fr;
  }

  .cs-project-nav {
    grid-template-columns: 1fr;
  }

  .cs-nav-link.next {
    border-left: none;
    border-top: 1px solid var(--brd);
    text-align: left;
    align-items: flex-start;
  }

  footer {
    flex-direction: column;
    gap: 10px;
    text-align: center;
  }

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

  .cs-screens-inner {
    padding: 0 24px;
  }

  .cs-screens-section {
    padding: 80px 0;
  }
}

@media (max-width: 960px) {
  .cs-screen {
    overflow: visible;
  }

  .cs-screen img {
    max-width: 100%;
    width: 100%;
    height: auto;
  }
}

@media (max-width: 700px) {
  .nav-hamburger {
    display: flex;
  }
}

/* ── Mobile overlay (appended to body by JS — outside nav stacking context) ── */
#mob-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(3, 8, 17, 0.96);
  backdrop-filter: blur(28px);
  -webkit-backdrop-filter: blur(28px);
  z-index: 900;
}
#mob-overlay.open { display: block; }

/* ── Mobile close button ── */
#mob-close {
  display: none;
  position: fixed;
  top: 16px;
  right: 20px;
  z-index: 902;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  background: rgba(12, 238, 196, 0.06);
  border: 1px solid rgba(12, 238, 196, 0.4);
  color: var(--a);
  font-family: var(--fm);
  font-size: 16px;
  line-height: 1;
  cursor: none;
  transition: background .2s, border-color .2s;
}
#mob-close.open { display: flex; }
#mob-close:hover, #mob-close:active {
  background: rgba(12, 238, 196, 0.14);
  border-color: var(--a);
}

/* ── Mobile nav menu when moved to body level by JS ── */
body > #nav-menu {
  position: fixed;
  inset: 0;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0;
  z-index: 901;
  list-style: none;
  padding: 0;
  margin: 0;
}
body > #nav-menu.open { display: flex; }

body > #nav-menu li {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .35s ease, transform .35s ease;
  width: 220px;
}
body > #nav-menu.open li:nth-child(1) { opacity:1; transform:none; transition-delay:.06s; }
body > #nav-menu.open li:nth-child(2) { opacity:1; transform:none; transition-delay:.12s; }
body > #nav-menu.open li:nth-child(3) { opacity:1; transform:none; transition-delay:.18s; }
body > #nav-menu.open li:nth-child(4) { opacity:1; transform:none; transition-delay:.24s; }
body > #nav-menu.open li:nth-child(5) { opacity:1; transform:none; transition-delay:.30s; }

body > #nav-menu a {
  display: block;
  width: 100%;
  padding: 18px 0;
  font-family: var(--fm);
  font-size: 12px;
  letter-spacing: .4em;
  text-transform: uppercase;
  color: var(--txt-hi);
  text-align: center;
  text-decoration: none;
  border-bottom: 1px solid rgba(12, 238, 196, 0.18);
  transition: color .2s, border-color .2s;
}
body > #nav-menu li:first-child a { border-top: 1px solid rgba(12, 238, 196, 0.18); }

body > #nav-menu a:hover,
body > #nav-menu a:active {
  color: var(--a);
  border-bottom-color: rgba(12, 238, 196, 0.5);
}
body > #nav-menu .n {
  color: var(--a);
  margin-right: 8px;
}

@media (max-width: 560px) {
  .proc-grid {
    grid-template-columns: 1fr;
  }

  .cs-outcomes {
    grid-template-columns: 1fr;
  }

  .ov-bar {
    grid-template-columns: 1fr;
  }

  .cs-screen {
    overflow: visible;
    clip-path: none;
    min-height: auto;
  }

  .cs-screen img {
    max-width: 100%;
    width: 100%;
    height: auto;
  }

  .cs-screen-bg {
    display: none;
  }

  .hud-tl, .hud-tr, .hud-bl, .hud-br {
    display: none;
  }

  img {
    position: relative;
    z-index: 10;
  }
}