/* ==========================================================================
   DEVSTUDIO PORTFOLIO - INTERACTIVE CARD GALLERY SLIDER & LIGHTBOX STYLING
   ========================================================================== */

:root {
  --bg-dark: #0d1117;
  --bg-surface: #161b22;
  --bg-surface-hover: #1c2128;
  --bg-subtle: #21262d;

  --border-color: #30363d;
  --border-active: #58a6ff;

  --accent-sky: #38bdf8;
  --accent-blue: #2563eb;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-violet: #818cf8;

  --text-main: #f0f6fc;
  --text-muted: #8b949e;
  --text-dim: #6e7681;

  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

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

  --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

h1, h2, h3, h4, h5 { color: var(--text-main); font-weight: 700; line-height: 1.25; }
p { color: var(--text-muted); }
a { color: inherit; text-decoration: none; }
.text-center { text-align: center; }

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(13, 17, 23, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.9rem 0;
}

.nav-container { display: flex; justify-content: space-between; align-items: center; }

.nav-logo { display: flex; align-items: center; gap: 0.6rem; font-weight: 800; font-size: 1.15rem; }
.logo-icon {
  display: flex; align-items: center; justify-content: center;
  width: 32px; height: 32px; border-radius: var(--radius-sm);
  background: var(--accent-blue); color: #fff;
}
.logo-icon-img { width: 22px; height: auto; display: block; }

.nav-menu { display: flex; align-items: center; gap: 1.8rem; }
.nav-link { font-size: 0.9rem; font-weight: 500; color: var(--text-muted); transition: var(--transition); }
.nav-link:hover { color: var(--text-main); }

.btn-nav-cta {
  display: flex; align-items: center; gap: 0.4rem; padding: 0.45rem 1rem;
  border-radius: var(--radius-sm); background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-color); color: var(--text-main);
}
.btn-nav-cta:hover { background: var(--accent-blue); border-color: var(--accent-blue); color: #fff; }

.hamburger-btn { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; }
.hamburger-btn span { width: 22px; height: 2px; background-color: var(--text-main); border-radius: 1px; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  padding: 0.75rem 1.4rem; border-radius: var(--radius-sm); font-weight: 600; font-size: 0.9rem;
  cursor: pointer; transition: var(--transition); border: 1px solid transparent;
}
.btn-primary { background: var(--accent-blue); color: #fff; }
.btn-primary:hover { background: #1d4ed8; transform: translateY(-1px); }

.btn-secondary { background: var(--bg-surface); border-color: var(--border-color); color: var(--text-main); }
.btn-secondary:hover { background: var(--bg-subtle); border-color: var(--text-muted); }

.btn-whatsapp { background: #25d366; color: #fff; }
.btn-whatsapp:hover { background: #20ba5a; }

.btn-card { width: 100%; background: var(--bg-subtle); border-color: var(--border-color); color: var(--text-main); font-size: 0.85rem; padding: 0.5rem; }
.btn-card:hover { background: var(--accent-blue); border-color: var(--accent-blue); color: #fff; }
.btn-sm { padding: 0.45rem 0.9rem; font-size: 0.82rem; }

/* Hero */
.hero-section {
  padding: 8.5rem 0 4.5rem 0; border-bottom: 1px solid var(--border-color);
  background: radial-gradient(circle at 50% 0%, rgba(37, 99, 235, 0.06) 0%, transparent 60%);
}
.hero-container { display: flex; flex-direction: column; align-items: center; text-align: center; }

.hero-pill {
  display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.35rem 0.9rem;
  border-radius: 999px; background: var(--bg-surface); border: 1px solid var(--border-color);
  color: var(--accent-sky); font-size: 0.82rem; font-weight: 600; margin-bottom: 1.5rem;
}
.pill-dot { width: 7px; height: 7px; border-radius: 50%; background-color: var(--accent-emerald); }

.hero-title { font-size: clamp(2.1rem, 4.5vw, 3.4rem); letter-spacing: -0.02em; max-width: 880px; margin-bottom: 1.2rem; }
.accent-text { color: var(--accent-sky); }
.hero-description { font-size: 1.1rem; max-width: 720px; margin-bottom: 2rem; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 0.8rem; justify-content: center; margin-bottom: 3.5rem; }

.features-ribbon {
  display: flex; gap: 2rem; padding: 1rem 2rem; background: var(--bg-surface);
  border: 1px solid var(--border-color); border-radius: var(--radius-md); flex-wrap: wrap; justify-content: center;
}
.ribbon-item { display: flex; align-items: center; gap: 0.5rem; font-size: 0.88rem; color: var(--text-muted); }
.ribbon-item svg { color: var(--accent-sky); }

/* Projects Section */
.projects-section { padding: 5rem 0; }
.section-header { margin-bottom: 2.5rem; }
.section-tag { font-family: var(--font-mono); font-size: 0.78rem; text-transform: uppercase; color: var(--accent-sky); letter-spacing: 0.06em; }
.section-title { font-size: clamp(1.7rem, 3.5vw, 2.5rem); margin-top: 0.3rem; margin-bottom: 0.5rem; }
.section-subtitle { font-size: 0.98rem; max-width: 600px; margin: 0 auto; }

/* Filter Bar */
.filter-bar { display: flex; justify-content: center; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 3rem; }
.filter-btn {
  padding: 0.5rem 1.1rem; border-radius: var(--radius-sm); background: var(--bg-surface);
  border: 1px solid var(--border-color); color: var(--text-muted); font-size: 0.85rem; font-weight: 500;
  cursor: pointer; transition: var(--transition);
}
.filter-btn:hover { background: var(--bg-subtle); color: var(--text-main); }
.filter-btn.active { background: var(--accent-blue); border-color: var(--accent-blue); color: #fff; }

/* Projects Grid */
.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); gap: 1.8rem; }

.project-card {
  background: var(--bg-surface); border: 1px solid var(--border-color);
  border-radius: var(--radius-lg); overflow: hidden; display: flex; flex-direction: column;
  transition: var(--transition);
}
.project-card:hover { border-color: var(--border-active); transform: translateY(-4px); box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4); }

/* --- INTERACTIVE CARD GALLERY SLIDER --- */
.card-visual {
  padding: 0.8rem;
  background: #080c14;
  border-bottom: 1px solid var(--border-color);
}

.card-gallery-slider {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-areas:
    "viewport viewport viewport"
    "prev counter next";
  width: 100%;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #0d1117;
  border: 1px solid var(--border-color);
}

.gallery-viewport {
  grid-area: viewport;
  position: relative;
  width: 100%;
  height: 170px;
  overflow: hidden;
}

.gallery-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.gallery-img.active {
  opacity: 1;
}

.gallery-arrow {
  background: var(--bg-surface);
  border: none;
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
  width: 36px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.2rem;
  line-height: 1;
  transition: var(--transition);
  user-select: none;
}

.gallery-arrow:hover {
  color: #fff;
  background: var(--accent-blue);
}

.prev-arrow { grid-area: prev; justify-content: flex-start; padding-left: 0.6rem; }
.next-arrow { grid-area: next; justify-content: flex-end; padding-right: 0.6rem; }

.gallery-counter {
  grid-area: counter;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-secondary);
}

/* CARD CONTENT DETAILS */
.card-content { padding: 1.4rem; display: flex; flex-direction: column; flex-grow: 1; }

.card-meta { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.6rem; }

.category-badge {
  font-family: var(--font-mono); font-size: 0.72rem; color: var(--accent-sky);
  background: rgba(56, 189, 248, 0.1); padding: 0.2rem 0.5rem; border-radius: 4px;
}

.private-badge {
  font-size: 0.7rem; color: var(--accent-amber); background: rgba(245, 158, 11, 0.1);
  padding: 0.2rem 0.5rem; border-radius: 4px;
}

.public-badge {
  font-size: 0.7rem; color: var(--accent-emerald); background: rgba(16, 185, 129, 0.1);
  padding: 0.2rem 0.5rem; border-radius: 4px;
}

.card-title { font-size: 1.25rem; margin-bottom: 0.5rem; }
.card-desc { font-size: 0.88rem; margin-bottom: 1rem; }

.card-info-table {
  background: var(--bg-dark); border: 1px solid var(--border-color);
  border-radius: var(--radius-sm); padding: 0.75rem; margin-bottom: 1.2rem;
  display: flex; flex-direction: column; gap: 0.4rem;
}

.info-row { font-size: 0.8rem; display: flex; gap: 0.4rem; }
.i-label { font-weight: 700; color: var(--text-main); min-width: 65px; }
.i-val { color: var(--text-muted); }
.accent-val { color: var(--accent-emerald); }

.card-footer { margin-top: auto; display: flex; flex-direction: column; gap: 0.8rem; }

.tech-tags { display: flex; gap: 0.4rem; font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-muted); }
.tech-tags span { background: var(--bg-subtle); padding: 0.15rem 0.4rem; border-radius: 3px; }

/* Approach Section */
.approach-section { padding: 5rem 0; background: #090d14; border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); }
.approach-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1.2rem; }
.approach-card { background: var(--bg-surface); border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 1.5rem; }
.card-num { font-family: var(--font-mono); font-size: 1.2rem; font-weight: 700; color: var(--accent-sky); margin-bottom: 0.6rem; }
.approach-card h4 { font-size: 1.05rem; margin-bottom: 0.4rem; }
.approach-card p { font-size: 0.88rem; }

/* Stack Section */
.stack-section { padding: 5rem 0; }
.stack-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.2rem; }
.stack-box { background: var(--bg-surface); border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 1.5rem; }
.stack-box h5 { font-size: 1rem; color: var(--accent-sky); margin-bottom: 0.6rem; }
.stack-box p { font-size: 0.88rem; }

/* Contact Section */
.contact-section { padding: 5rem 0; }
.contact-card { background: var(--bg-surface); border: 1px solid var(--border-color); border-radius: var(--radius-lg); padding: 3rem 1.5rem; }
.contact-title { font-size: 1.8rem; margin-bottom: 0.8rem; }
.contact-desc { font-size: 1rem; max-width: 600px; margin: 0 auto 2rem auto; }

.btn-doc-link {
  display: inline-flex; align-items: center; gap: 0.5rem;
  margin-top: 1.2rem; padding: 0.55rem 1rem;
  background: var(--bg-subtle); border: 1px solid var(--border-color); border-radius: var(--radius-sm);
  color: var(--text-muted); font-size: 0.85rem; font-weight: 500; font-family: inherit;
  cursor: pointer; transition: var(--transition);
}
.btn-doc-link:hover { color: var(--text-main); border-color: var(--accent-sky); background: var(--bg-surface-hover); }
.btn-doc-link svg { flex-shrink: 0; }

/* Footer */
.footer { padding: 2rem 0; border-top: 1px solid var(--border-color); font-size: 0.85rem; color: var(--text-muted); }
.footer-social { display: flex; justify-content: center; margin-top: 0.75rem; }
.footer-social a { color: var(--text-muted); transition: var(--transition); }
.footer-social a:hover { color: var(--accent-sky); }

/* Modal & Screenshot Gallery Grid */
.modal-overlay {
  position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; background: rgba(0, 0, 0, 0.85);
  z-index: 2000; display: flex; align-items: center; justify-content: center; padding: 1rem;
  opacity: 0; pointer-events: none; transition: opacity 0.2s ease;
}
.modal-overlay.active { opacity: 1; pointer-events: auto; }

.modal-window {
  background: var(--bg-surface); border: 1px solid var(--border-color);
  border-radius: var(--radius-lg); width: 100%; max-width: 760px; max-height: 90vh;
  overflow-y: auto; position: relative; display: flex; flex-direction: column;
}

.modal-close {
  position: absolute; top: 1rem; right: 1rem; background: var(--bg-subtle);
  border: 1px solid var(--border-color); color: var(--text-muted); width: 32px; height: 32px;
  border-radius: 50%; font-size: 1.3rem; display: flex; align-items: center; justify-content: center; cursor: pointer;
}

.modal-header { padding: 1.8rem 1.8rem 1rem 1.8rem; border-bottom: 1px solid var(--border-color); }
.modal-badge { font-family: var(--font-mono); font-size: 0.75rem; color: var(--accent-sky); margin-bottom: 0.4rem; display: inline-block; }
.modal-title { font-size: 1.4rem; margin-bottom: 0.4rem; }
.modal-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }

.modal-tabs { display: flex; background: #090d14; border-bottom: 1px solid var(--border-color); overflow-x: auto; }
.modal-tab-btn {
  padding: 0.75rem 1.2rem; background: none; border: none; border-bottom: 2px solid transparent;
  color: var(--text-muted); font-weight: 500; font-size: 0.85rem; cursor: pointer; white-space: nowrap;
}
.modal-tab-btn.active { color: var(--text-main); border-bottom-color: var(--accent-blue); background: var(--bg-surface); }

.modal-body { padding: 1.5rem 1.8rem; flex-grow: 1; }
.tab-content { display: none; }
.tab-content.active { display: block; }

/* Contract Template Modal */
.contract-modal-window { max-width: 820px; }
.contract-modal-body { max-height: 68vh; overflow-y: auto; }

.contract-doc { font-size: 0.88rem; line-height: 1.7; color: var(--text-muted); }
.contract-doc h3 {
  color: var(--text-main); font-size: 1.05rem; line-height: 1.4;
  margin: 2rem 0 0.8rem 0; padding-top: 1.6rem; border-top: 1px solid var(--border-color);
}
.contract-doc h3:first-child { margin-top: 0; padding-top: 0; border-top: none; }
.contract-doc h4 {
  color: var(--accent-sky); font-size: 0.78rem; font-family: var(--font-mono);
  text-transform: uppercase; letter-spacing: 0.03em; margin: 1.6rem 0 0.6rem 0;
}
.contract-doc p { margin-bottom: 0.8rem; }
.contract-doc strong { color: var(--text-main); }
.contract-doc ol, .contract-doc ul { margin: 0 0 0.8rem 1.3rem; }
.contract-doc li { margin-bottom: 0.5rem; }
.contract-doc ul ul, .contract-doc ol ul { margin-top: 0.5rem; }

.contract-signatures {
  margin-top: 2rem; padding-top: 1.5rem; border-top: 1px dashed var(--border-color);
  display: flex; gap: 2rem; flex-wrap: wrap; font-size: 0.85rem; color: var(--text-main);
}
.contract-signatures span { display: block; font-size: 0.72rem; color: var(--text-dim); font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.03em; margin-bottom: 0.3rem; }

.info-card { padding: 1rem 1.2rem; border-radius: var(--radius-sm); background: var(--bg-dark); border: 1px solid var(--border-color); }
.warning-card h4 { color: var(--accent-amber); margin-bottom: 0.4rem; }
.success-card h4 { color: var(--accent-emerald); margin-bottom: 0.4rem; }
.auth-card h4 { color: var(--accent-sky); margin-bottom: 0.4rem; }

.screenshot-gallery {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; margin-top: 1rem;
}

.gallery-thumb { background: none; border: none; padding: 0; margin: 0; display: block; cursor: pointer; }

.modal-gallery-img {
  width: 100%; height: 160px; object-fit: cover; object-position: top;
  border-radius: 6px; border: 1px solid var(--border-color); cursor: pointer; transition: var(--transition);
}
.modal-gallery-img:hover { transform: scale(1.03); border-color: var(--accent-sky); }

/* Image Lightbox */
.lightbox-overlay {
  position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; background: rgba(0, 0, 0, 0.92);
  z-index: 3000; display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none; transition: opacity 0.2s ease;
}
.lightbox-overlay.active { opacity: 1; pointer-events: auto; }

.lightbox-stage { max-width: 88vw; max-height: 82vh; display: flex; align-items: center; justify-content: center; }
.lightbox-stage img {
  max-width: 88vw; max-height: 82vh; object-fit: contain;
  border-radius: 8px; border: 1px solid var(--border-color); box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.lightbox-close {
  position: absolute; top: 1.2rem; right: 1.2rem; background: var(--bg-subtle);
  border: 1px solid var(--border-color); color: #fff; width: 38px; height: 38px;
  border-radius: 50%; font-size: 1.5rem; display: flex; align-items: center; justify-content: center;
  cursor: pointer; z-index: 10;
}

.lightbox-arrow {
  position: absolute; top: 50%; transform: translateY(-50%);
  background: rgba(13, 17, 23, 0.85); border: 1px solid var(--border-color); color: #fff;
  width: 44px; height: 44px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  cursor: pointer; font-size: 1.6rem; transition: var(--transition); z-index: 10;
}
.lightbox-arrow:hover { background: var(--accent-blue); border-color: var(--accent-blue); }
.lightbox-prev { left: 1.2rem; }
.lightbox-next { right: 1.2rem; }

.lightbox-counter {
  position: absolute; bottom: 1.2rem; left: 50%; transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.75); border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 0.25rem 0.7rem; border-radius: 4px; font-family: var(--font-mono);
  font-size: 0.75rem; color: #fff;
}

@media (max-width: 640px) {
  .lightbox-arrow { width: 36px; height: 36px; font-size: 1.3rem; }
  .lightbox-prev { left: 0.5rem; }
  .lightbox-next { right: 0.5rem; }
}

.demo-cred-box {
  margin-top: 0.8rem; padding: 0.75rem; background: #090d14; border: 1px dashed var(--border-color);
  border-radius: 4px; font-family: var(--font-mono); font-size: 0.82rem;
}

.modal-footer {
  padding: 1rem 1.8rem; border-top: 1px solid var(--border-color); display: flex;
  justify-content: space-between; align-items: center; background: #090d14;
}

@media (max-width: 768px) {
  .hamburger-btn { display: flex; }
  .nav-menu {
    position: fixed; top: 60px; left: 0; width: 100%; background: var(--bg-dark);
    border-bottom: 1px solid var(--border-color); flex-direction: column; padding: 1.5rem;
    gap: 1rem; transform: translateY(-150%); transition: var(--transition);
  }
  .nav-menu.active { transform: translateY(0); }
  .features-ribbon { flex-direction: column; gap: 0.8rem; }
}

/* Floating WhatsApp Button */
.whatsapp-float {
  position: fixed;
  bottom: 1.75rem;
  right: 1.75rem;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: #25d366;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.4);
  z-index: 1200;
  transition: var(--transition);
}
.whatsapp-float:hover { background: #20ba5a; transform: translateY(-2px); }

@media (max-width: 640px) {
  .whatsapp-float { width: 52px; height: 52px; bottom: 1.1rem; right: 1.1rem; }
  .whatsapp-float svg { width: 26px; height: 26px; }
}