/* ============================
   Design Tokens / Root Styles
   ============================ */

:root {
  /* Brand colors */
  --color-primary: rgb(46, 194, 179);
  --color-primary-soft: rgba(46, 194, 179, 0.12);
  --color-secondary: rgb(253, 167, 133);
  --color-secondary-soft: rgba(253, 167, 133, 0.18);
  --color-tertiary: rgb(54, 55, 85);

  /* Neutral / UI */
  --color-bg: #f5f7fb;
  --color-surface: #ffffff;
  --color-surface-alt: #f0f2f8;
  --color-text-main: #1f2933;
  --color-text-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-shadow-soft: 0 10px 25px rgba(15, 23, 42, 0.06);

  /* Layout */
  --radius: 0.9rem;
  --radius-pill: 999px;
  --transition-base: all 0.25s ease;
}

/* Basic Reset */

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

/* ============================
   Base Typography & Layout
   ============================ */

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text-main);
  line-height: 1.6;
}

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

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Headings & text helpers */

.hero-title {
  font-size: clamp(2.4rem, 4vw, 3.2rem);
  font-weight: 700;
  color: var(--color-tertiary);
  margin-bottom: 1rem;
}

.section-title {
  font-size: clamp(2rem, 3vw, 2.4rem);
  font-weight: 700;
  text-align: center;
  color: var(--color-tertiary);
  margin-bottom: 0.75rem;
}

.section-subtitle {
  font-size: 0.98rem;
  color: var(--color-text-muted);
  text-align: center;
  max-width: 32rem;
  margin: 0.25rem auto 2.25rem;
}

.hero-tagline {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.4rem;
}

.hero-tagline--secondary {
  font-size: 0.98rem;
  color: var(--color-text-muted);
}

.hero-copy {
  font-size: 0.98rem;
  color: var(--color-text-muted);
  max-width: 36rem;
  margin: 0.5rem auto;
}

/* Utility */

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

.text-muted {
  color: var(--color-text-muted);
}

/* ============================
   Navigation
   ============================ */

.nav-sticky {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: rgba(245, 247, 251, 0.98);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--color-tertiary);
  font-weight: 700;
  letter-spacing: 0.12em;
  font-size: 0.9rem;
  text-transform: uppercase;
}

.logo-icon {
  width: 2rem;
  height: 2rem;
  object-fit: contain;
}

.nav-links {
  display: none;
  gap: 1.75rem;
}

.nav-link {
  text-decoration: none;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  position: relative;
  transition: var(--transition-base);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.2rem;
  width: 0;
  height: 2px;
  background: linear-gradient(
    90deg,
    var(--color-primary),
    var(--color-secondary)
  );
  transition: width 0.22s ease;
}

.nav-link:hover {
  color: var(--color-tertiary);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-link.active {
  color: var(--color-tertiary);
  font-weight: 600;
}

/* Mobile nav */

.mobile-menu-btn {
  display: inline-flex;
  padding: 0.4rem;
  border: none;
  background: transparent;
  cursor: pointer;
}

.hamburger {
  width: 1.3rem;
  height: 2px;
  background-color: var(--color-tertiary);
  position: relative;
  transition: var(--transition-base);
}

.hamburger::before,
.hamburger::after {
  content: "";
  position: absolute;
  width: 1.3rem;
  height: 2px;
  background-color: var(--color-tertiary);
  transition: var(--transition-base);
}

.hamburger::before {
  top: -5px;
}

.hamburger::after {
  top: 5px;
}

.mobile-menu {
  display: none;
  flex-direction: column;
  gap: 0.5rem;
  padding: 0 1.5rem 1rem;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.mobile-menu.show {
  display: flex;
}

.mobile-nav-link {
  text-decoration: none;
  font-size: 0.9rem;
  color: var(--color-text-main);
  padding: 0.5rem 0.75rem;
  border-radius: 0.5rem;
  transition: var(--transition-base);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
  background-color: var(--color-primary-soft);
  color: var(--color-tertiary);
}

/* Desktop-only nav */

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

  .mobile-menu-btn,
  .mobile-menu {
    display: none !important;
  }
}

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

.hero-section {
  padding: 5rem 0 4rem;
  background: radial-gradient(
      circle at top left,
      var(--color-primary-soft),
      transparent 55%
    ),
    radial-gradient(
      circle at bottom right,
      var(--color-secondary-soft),
      transparent 55%
    ),
    var(--color-bg);
}

.hero-content-center {
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition-base);
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: #ffffff;
  box-shadow: 0 8px 20px rgba(46, 194, 179, 0.35);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 28px rgba(46, 194, 179, 0.4);
}

.btn-secondary {
  background: var(--color-secondary);
  color: var(--color-tertiary);
}

.btn-secondary:hover {
  filter: brightness(1.05);
}

.btn-outline {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-tertiary);
}

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

/* Full width helper */

.btn-full {
  width: 100%;
}

/* ============================
   Filter Buttons (Portfolio / Skills)
   ============================ */

.filter-section {
  padding: 1rem 0 0.5rem;
}

.filter-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem;
}

.filter-btn {
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background-color: #ffffff;
  padding: 0.4rem 1.1rem;
  font-size: 0.85rem;
  cursor: pointer;
  color: var(--color-text-muted);
  transition: var(--transition-base);
}

.filter-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-tertiary);
  background-color: var(--color-primary-soft);
}

.filter-btn.active {
  background: linear-gradient(
    135deg,
    var(--color-primary),
    var(--color-secondary)
  );
  color: #ffffff;
  border-color: transparent;
}

/* ============================
   Projects / Cards Grid
   ============================ */

.projects-section {
  padding: 3rem 0 4rem;
}

.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
}

.project-card {
  background-color: var(--color-surface);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  overflow: hidden;
  box-shadow: var(--color-shadow-soft);
  transition: var(--transition-base);
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 35px rgba(15, 23, 42, 0.12);
  border-color: var(--color-primary-soft);
}

.project-image img {
  width: 100%;
  height: 190px;
  object-fit: cover;
}

.project-content {
  padding: 1.3rem 1.4rem 1.2rem;
}

.project-content h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-tertiary);
  margin-bottom: 0.4rem;
}

.project-content p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 0.8rem;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag {
  font-size: 0.72rem;
  padding: 0.2rem 0.7rem;
  border-radius: var(--radius-pill);
  background: var(--color-secondary-soft);
  color: var(--color-tertiary);
}

/* Empty state */

#noProjects,
#noSkills {
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  padding: 1.5rem 0;
}

/* ============================
   Skills Grid (if used)
   ============================ */

.skills-section {
  padding: 3rem 0 4rem;
}

.skills-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.skill-card {
  background-color: var(--color-surface);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  padding: 1.25rem 1.3rem;
  box-shadow: var(--color-shadow-soft);
  transition: var(--transition-base);
}

.skill-card:hover {
  border-color: var(--color-primary-soft);
  transform: translateY(-2px);
}

/* ============================
   Contact & Forms
   ============================ */

.contact-section {
  padding: 3rem 0 4rem;
}

.form-card {
  max-width: 640px;
  margin: 0 auto;
  background-color: var(--color-surface);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  padding: 1.75rem 1.8rem 1.9rem;
  box-shadow: var(--color-shadow-soft);
}

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

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-tertiary);
}

input,
select,
textarea {
  font: inherit;
  padding: 0.55rem 0.7rem;
  border-radius: 0.6rem;
  border: 1px solid var(--color-border);
  background-color: #ffffff;
  color: var(--color-text-main);
  transition: var(--transition-base);
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary-soft);
}

textarea {
  min-height: 120px;
  resize: vertical;
}

/* Notification (JS helper) */

.notification {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  padding: 0.6rem 0.8rem;
  border-radius: 0.6rem;
  border: 1px solid transparent;
}

.notification--success {
  background-color: rgba(46, 194, 179, 0.1);
  border-color: rgba(46, 194, 179, 0.6);
  color: #065f46;
}

.notification--error {
  background-color: rgba(253, 167, 133, 0.12);
  border-color: rgba(253, 167, 133, 0.8);
  color: #7c2d12;
}

.notification-info {
  background: #eff6ff;
  color: #1d4ed8;
  border: 1px solid #bfdbfe;
}

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

.site-footer {
  border-top: 1px solid var(--color-border);
  background-color: var(--color-surface-alt);
  padding: 1.2rem 1.5rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-align: center;
}

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

@media (min-width: 768px) {
  .projects-grid,
  .skills-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .projects-grid,
  .skills-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* Skill Cloud */
.skills-cloud {
  margin-top: 2.5rem;
}

.skills-cloud .section-title {
  text-align: center;
}

.skills-cloud .section-subtitle {
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

.cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 0.8rem;
  justify-content: center;
}

.skill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  border: 1px solid rgba(54, 55, 85, 0.15);
  background: rgba(54, 55, 85, 0.03);
  font-size: 0.82rem;
  line-height: 1.2;
  cursor: pointer;
  transition:
    transform 0.18s ease,
    box-shadow 0.18s ease,
    background-color 0.18s ease,
    color 0.18s ease,
    border-color 0.18s ease,
    opacity 0.18s ease;
  color: var(--color-text);
}

/* Size variations */
.skill.large {
  font-size: 0.95rem;
  padding: 0.45rem 1rem;
  font-weight: 600;
}

.skill.medium {
  font-size: 0.85rem;
}

.skill.small {
  font-size: 0.78rem;
}

/* Base hover (no JS highlight yet) */
.skill:hover {
  transform: translateY(-1px);
}

/* Highlight states driven by JS */
.skill--active {
  background: linear-gradient(
    135deg,
    rgba(46, 194, 179, 0.14),
    rgba(253, 167, 133, 0.14)
  );
  border-color: rgba(46, 194, 179, 0.75);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.06);
  color: var(--color-tertiary);
}

.skill--related {
  background: rgba(46, 194, 179, 0.07);
  border-color: rgba(46, 194, 179, 0.4);
  color: var(--color-tertiary);
}

.skill--dim {
  opacity: 0.35;
}

.card-link-wrapper {
  text-decoration: none;
  color: inherit;
  display: block;
}

.card-link-wrapper:hover .project-card {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0,0,0,0.08);
}