/* ============================================
   喷水 - 城市喷泉景观设计与水景艺术平台
   主样式文件 ps-main.css
   CSS前缀: ps- (Penshui)
   ============================================ */

/* === CSS Reset & Base (Mobile-First) === */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --ps-deep-blue: #0A2E5D;
  --ps-white: #FFFFFF;
  --ps-glow-cyan: #7DF9FF;
  --ps-light-blue: #E8F4FD;
  --ps-dark-text: #1A1A2E;
  --ps-gray-text: #6B7280;
  --ps-border: #E5E7EB;
  --ps-shadow: rgba(10, 46, 93, 0.08);
  --ps-overlay: rgba(10, 46, 93, 0.55);
  --ps-font-heading: 'Avenir Next', 'Optima', 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --ps-font-body: 'Helvetica Neue', 'Arial', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--ps-font-body);
  color: var(--ps-dark-text);
  background-color: var(--ps-white);
  line-height: 1.8;
  overflow-x: hidden;
}

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

a {
  color: var(--ps-deep-blue);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--ps-glow-cyan);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--ps-font-heading);
  font-weight: 600;
  line-height: 1.3;
  color: var(--ps-deep-blue);
}

/* === Navigation === */
.ps-nav {
  position: relative;
  width: 100%;
  background: var(--ps-white);
  box-shadow: 0 2px 12px var(--ps-shadow);
  z-index: 100;
}

.ps-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0.75rem 1rem;
}

.ps-nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--ps-font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--ps-deep-blue);
  white-space: nowrap;
}

.ps-nav-logo img {
  height: 36px;
  width: auto;
}

.ps-nav-links {
  display: none;
  list-style: none;
  gap: 0;
}

.ps-nav-links.ps-nav-open {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--ps-white);
  box-shadow: 0 8px 24px var(--ps-shadow);
  padding: 1rem 0;
  z-index: 99;
}

.ps-nav-link {
  display: block;
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  color: var(--ps-dark-text);
  position: relative;
  transition: color 0.3s ease, background 0.3s ease;
}

.ps-nav-link:hover,
.ps-nav-link.ps-active {
  color: var(--ps-deep-blue);
  background: var(--ps-light-blue);
}

.ps-nav-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.ps-nav-search {
  display: none;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--ps-border);
  border-radius: 20px;
  font-size: 0.85rem;
  outline: none;
  width: 160px;
  transition: border-color 0.3s;
}

.ps-nav-search:focus {
  border-color: var(--ps-glow-cyan);
}

.ps-nav-contact {
  display: inline-block;
  padding: 0.5rem 1.2rem;
  background: var(--ps-deep-blue);
  color: var(--ps-white);
  border-radius: 24px;
  font-size: 0.85rem;
  font-weight: 500;
  transition: background 0.3s ease, transform 0.2s ease;
  white-space: nowrap;
}

.ps-nav-contact:hover {
  background: #0D3A75;
  color: var(--ps-white);
  transform: translateY(-1px);
}

/* Hamburger Menu */
.ps-hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.ps-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--ps-deep-blue);
  transition: transform 0.3s, opacity 0.3s;
}

.ps-hamburger.ps-open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.ps-hamburger.ps-open span:nth-child(2) {
  opacity: 0;
}

.ps-hamburger.ps-open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* === Hero Section === */
.ps-hero {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 500px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ps-hero-video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
}

.ps-hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, rgba(10,46,93,0.6) 0%, rgba(10,46,93,0.3) 50%, rgba(10,46,93,0.7) 100%);
  z-index: 2;
}

.ps-hero-content {
  position: relative;
  z-index: 3;
  text-align: center;
  padding: 2rem 1.5rem;
  max-width: 800px;
}

.ps-hero-title {
  font-size: 2rem;
  color: var(--ps-white);
  margin-bottom: 1rem;
  text-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

.ps-hero-subtitle {
  font-size: 1rem;
  color: rgba(255,255,255,0.9);
  margin-bottom: 2rem;
  line-height: 1.8;
}

.ps-hero-btn {
  display: inline-block;
  padding: 0.9rem 2.5rem;
  background: transparent;
  color: var(--ps-white);
  border: 2px solid var(--ps-glow-cyan);
  border-radius: 30px;
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  transition: all 0.3s ease;
}

.ps-hero-btn:hover {
  background: var(--ps-glow-cyan);
  color: var(--ps-deep-blue);
}

/* === Section Base === */
.ps-section {
  padding: 4rem 1.5rem;
  max-width: 1440px;
  margin: 0 auto;
}

.ps-section-alt {
  background: var(--ps-light-blue);
}

.ps-section-dark {
  background: var(--ps-deep-blue);
  color: var(--ps-white);
}

.ps-section-title {
  font-size: 1.6rem;
  text-align: center;
  margin-bottom: 1rem;
  position: relative;
}

.ps-section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--ps-glow-cyan);
  margin: 0.75rem auto 0;
  border-radius: 2px;
}

.ps-section-desc {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 3rem;
  color: var(--ps-gray-text);
  font-size: 0.95rem;
  line-height: 1.8;
}

.ps-section-dark .ps-section-desc {
  color: rgba(255,255,255,0.8);
}

.ps-section-dark .ps-section-title {
  color: var(--ps-white);
}

/* === Card Grid === */
.ps-card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.ps-card {
  background: var(--ps-white);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 20px var(--ps-shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.ps-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(10,46,93,0.15);
}

.ps-card-img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.ps-card-body {
  padding: 1.5rem;
}

.ps-card-title {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
  color: var(--ps-deep-blue);
}

.ps-card-text {
  font-size: 0.9rem;
  color: var(--ps-gray-text);
  line-height: 1.7;
}

.ps-card-link {
  display: inline-block;
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--ps-deep-blue);
  font-weight: 500;
  border-bottom: 1px solid var(--ps-glow-cyan);
  padding-bottom: 2px;
  transition: color 0.3s;
}

.ps-card-link:hover {
  color: var(--ps-glow-cyan);
}

/* === Philosophy Section === */
.ps-philosophy {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: center;
}

.ps-philosophy-img {
  width: 100%;
  border-radius: 12px;
  box-shadow: 0 4px 20px var(--ps-shadow);
}

.ps-philosophy-text {
  max-width: 600px;
}

.ps-philosophy-text p {
  margin-bottom: 1.2rem;
  font-size: 0.95rem;
  line-height: 2;
  color: var(--ps-gray-text);
}

.ps-philosophy-text blockquote {
  border-left: 4px solid var(--ps-glow-cyan);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  background: var(--ps-light-blue);
  border-radius: 0 8px 8px 0;
  font-style: italic;
  color: var(--ps-deep-blue);
}

/* === Gallery Grid === */
.ps-gallery-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.ps-gallery-item {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  cursor: pointer;
}

.ps-gallery-item img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.ps-gallery-item:hover img {
  transform: scale(1.05);
}

.ps-gallery-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 1.5rem;
  background: linear-gradient(transparent, rgba(10,46,93,0.85));
  color: var(--ps-white);
}

.ps-gallery-caption h3 {
  font-size: 1rem;
  color: var(--ps-white);
  margin-bottom: 0.25rem;
}

.ps-gallery-caption p {
  font-size: 0.8rem;
  opacity: 0.85;
}

/* === Interview / Master Section === */
.ps-interview {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: center;
}

.ps-interview-img {
  width: 100%;
  max-width: 500px;
  border-radius: 12px;
  box-shadow: 0 4px 20px var(--ps-shadow);
}

.ps-interview-content {
  max-width: 600px;
}

.ps-interview-content h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.ps-interview-content p {
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--ps-gray-text);
  margin-bottom: 1rem;
}

/* === CTA Section === */
.ps-cta {
  text-align: center;
  padding: 4rem 1.5rem;
  background: linear-gradient(135deg, var(--ps-deep-blue) 0%, #143D7A 100%);
  color: var(--ps-white);
}

.ps-cta-title {
  font-size: 1.8rem;
  color: var(--ps-white);
  margin-bottom: 1rem;
}

.ps-cta-text {
  font-size: 1rem;
  opacity: 0.9;
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.ps-cta-btn {
  display: inline-block;
  padding: 0.9rem 2.5rem;
  background: var(--ps-glow-cyan);
  color: var(--ps-deep-blue);
  border-radius: 30px;
  font-size: 1rem;
  font-weight: 600;
  transition: all 0.3s ease;
}

.ps-cta-btn:hover {
  background: var(--ps-white);
  color: var(--ps-deep-blue);
  transform: translateY(-2px);
}

/* === Process Steps === */
.ps-process {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  counter-reset: ps-step;
}

.ps-process-step {
  text-align: center;
  padding: 2rem 1.5rem;
  background: var(--ps-white);
  border-radius: 12px;
  box-shadow: 0 4px 20px var(--ps-shadow);
  counter-increment: ps-step;
  position: relative;
}

.ps-process-step::before {
  content: counter(ps-step, decimal-leading-zero);
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--ps-glow-cyan);
  font-family: var(--ps-font-heading);
  margin-bottom: 0.75rem;
}

.ps-process-step h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.ps-process-step p {
  font-size: 0.9rem;
  color: var(--ps-gray-text);
  line-height: 1.7;
}

/* === Testimonials === */
.ps-testimonials {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.ps-testimonial {
  padding: 2rem;
  background: var(--ps-white);
  border-radius: 12px;
  box-shadow: 0 4px 20px var(--ps-shadow);
  border-left: 4px solid var(--ps-glow-cyan);
}

.ps-testimonial-text {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--ps-gray-text);
  margin-bottom: 1rem;
  font-style: italic;
}

.ps-testimonial-author {
  font-weight: 600;
  color: var(--ps-deep-blue);
  font-size: 0.9rem;
}

/* === Footer === */
.ps-footer {
  background: var(--ps-deep-blue);
  color: rgba(255,255,255,0.85);
  padding: 3rem 1.5rem 1.5rem;
}

.ps-footer-inner {
  max-width: 1440px;
  margin: 0 auto;
}

.ps-footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.ps-footer-col h4 {
  color: var(--ps-white);
  font-size: 1rem;
  margin-bottom: 1rem;
  position: relative;
  padding-bottom: 0.5rem;
}

.ps-footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--ps-glow-cyan);
}

.ps-footer-col p,
.ps-footer-col li {
  font-size: 0.85rem;
  line-height: 2;
  color: rgba(255,255,255,0.7);
}

.ps-footer-col ul {
  list-style: none;
}

.ps-footer-col a {
  color: rgba(255,255,255,0.7);
  transition: color 0.3s;
}

.ps-footer-col a:hover {
  color: var(--ps-glow-cyan);
}

.ps-footer-honors {
  border-top: 1px solid rgba(255,255,255,0.15);
  padding-top: 1.5rem;
  margin-bottom: 1.5rem;
}

.ps-footer-honors ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.ps-footer-honors li {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.7);
  padding: 0.4rem 0.8rem;
  background: rgba(255,255,255,0.08);
  border-radius: 20px;
  white-space: nowrap;
}

.ps-footer-bottom {
  text-align: center;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.15);
}

.ps-footer-bottom p {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
  line-height: 2;
}

.ps-footer-auth {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.4);
  margin-top: 0.5rem;
}

/* === Breadcrumb === */
.ps-breadcrumb {
  padding: 1rem 1.5rem;
  max-width: 1440px;
  margin: 0 auto;
  font-size: 0.85rem;
  color: var(--ps-gray-text);
}

.ps-breadcrumb a {
  color: var(--ps-deep-blue);
}

.ps-breadcrumb span {
  margin: 0 0.5rem;
  color: var(--ps-border);
}

/* === Page Header === */
.ps-page-header {
  position: relative;
  height: 350px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.ps-page-header-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.ps-page-header-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--ps-overlay);
}

.ps-page-header-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 0 1.5rem;
}

.ps-page-header-content h1 {
  color: var(--ps-white);
  font-size: 2rem;
  text-shadow: 0 2px 12px rgba(0,0,0,0.3);
}

.ps-page-header-content p {
  color: rgba(255,255,255,0.85);
  margin-top: 0.75rem;
  font-size: 1rem;
}

/* === Article Content === */
.ps-article {
  max-width: 900px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

.ps-article h2 {
  font-size: 1.4rem;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--ps-light-blue);
}

.ps-article h3 {
  font-size: 1.15rem;
  margin: 2rem 0 0.75rem;
}

.ps-article p {
  margin-bottom: 1.2rem;
  font-size: 0.95rem;
  line-height: 2;
  color: var(--ps-gray-text);
}

.ps-article img {
  border-radius: 12px;
  margin: 2rem 0;
  box-shadow: 0 4px 20px var(--ps-shadow);
}

.ps-article blockquote {
  border-left: 4px solid var(--ps-glow-cyan);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  background: var(--ps-light-blue);
  border-radius: 0 8px 8px 0;
  font-style: italic;
  color: var(--ps-deep-blue);
}

.ps-article-meta {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--ps-border);
  font-size: 0.85rem;
  color: var(--ps-gray-text);
}

/* === Form Styles === */
.ps-form {
  max-width: 600px;
  margin: 0 auto;
}

.ps-form-group {
  margin-bottom: 1.5rem;
}

.ps-form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--ps-deep-blue);
  margin-bottom: 0.5rem;
}

.ps-form-input,
.ps-form-textarea,
.ps-form-file {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--ps-border);
  border-radius: 8px;
  font-size: 0.9rem;
  font-family: var(--ps-font-body);
  transition: border-color 0.3s;
  background: var(--ps-white);
}

.ps-form-input:focus,
.ps-form-textarea:focus {
  outline: none;
  border-color: var(--ps-glow-cyan);
  box-shadow: 0 0 0 3px rgba(125,249,255,0.15);
}

.ps-form-textarea {
  min-height: 150px;
  resize: vertical;
}

.ps-form-submit {
  display: inline-block;
  padding: 0.9rem 2.5rem;
  background: var(--ps-deep-blue);
  color: var(--ps-white);
  border: none;
  border-radius: 30px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
}

.ps-form-submit:hover {
  background: #0D3A75;
  transform: translateY(-2px);
}

/* === Waterfall / Masonry === */
.ps-waterfall {
  column-count: 1;
  column-gap: 1.5rem;
}

.ps-waterfall-item {
  break-inside: avoid;
  margin-bottom: 1.5rem;
  background: var(--ps-white);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 20px var(--ps-shadow);
}

.ps-waterfall-item img {
  width: 100%;
  height: auto;
}

.ps-waterfall-body {
  padding: 1.25rem;
}

.ps-waterfall-body h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.ps-waterfall-body p {
  font-size: 0.85rem;
  color: var(--ps-gray-text);
  line-height: 1.7;
}

.ps-waterfall-actions {
  display: flex;
  gap: 1rem;
  margin-top: 0.75rem;
  font-size: 0.8rem;
  color: var(--ps-gray-text);
}

.ps-waterfall-actions button {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--ps-gray-text);
  font-size: 0.8rem;
  transition: color 0.3s;
}

.ps-waterfall-actions button:hover {
  color: var(--ps-deep-blue);
}

/* === App Download === */
.ps-app-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  padding: 4rem 1.5rem;
  text-align: center;
}

.ps-app-mockup {
  max-width: 300px;
  border-radius: 24px;
  box-shadow: 0 8px 40px rgba(10,46,93,0.2);
}

.ps-app-buttons {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.5rem;
}

.ps-app-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.9rem 2rem;
  background: var(--ps-deep-blue);
  color: var(--ps-white);
  border-radius: 12px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
}

.ps-app-btn:hover {
  background: #0D3A75;
  color: var(--ps-white);
  transform: translateY(-2px);
}

.ps-app-btn svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

/* === FAQ Section === */
.ps-faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.ps-faq-item {
  border-bottom: 1px solid var(--ps-border);
  padding: 1.25rem 0;
}

.ps-faq-question {
  font-size: 1rem;
  font-weight: 600;
  color: var(--ps-deep-blue);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.ps-faq-question::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--ps-glow-cyan);
  transition: transform 0.3s;
}

.ps-faq-question.ps-faq-open::after {
  transform: rotate(45deg);
}

.ps-faq-answer {
  display: none;
  padding-top: 0.75rem;
  font-size: 0.9rem;
  color: var(--ps-gray-text);
  line-height: 1.8;
}

.ps-faq-answer.ps-faq-show {
  display: block;
}

/* === Video Section === */
.ps-video-container {
  position: relative;
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 20px var(--ps-shadow);
}

.ps-video-container video {
  width: 100%;
  display: block;
}

/* === Modal === */
.ps-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.6);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.ps-modal.ps-modal-show {
  display: flex;
}

.ps-modal-content {
  background: var(--ps-white);
  padding: 2.5rem;
  border-radius: 16px;
  max-width: 450px;
  width: 90%;
  text-align: center;
  box-shadow: 0 16px 48px rgba(0,0,0,0.2);
}

.ps-modal-content h3 {
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

.ps-modal-content p {
  color: var(--ps-gray-text);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.ps-modal-close {
  display: inline-block;
  padding: 0.6rem 2rem;
  background: var(--ps-deep-blue);
  color: var(--ps-white);
  border: none;
  border-radius: 24px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: background 0.3s;
}

.ps-modal-close:hover {
  background: #0D3A75;
}

/* === Internal Links Highlight === */
.ps-internal-link {
  color: var(--ps-deep-blue);
  border-bottom: 1px dashed var(--ps-glow-cyan);
  padding-bottom: 1px;
  transition: all 0.3s;
}

.ps-internal-link:hover {
  color: var(--ps-glow-cyan);
  border-bottom-style: solid;
}

/* === Feature List === */
.ps-feature-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.ps-feature-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.5rem;
  background: var(--ps-white);
  border-radius: 12px;
  box-shadow: 0 4px 20px var(--ps-shadow);
}

.ps-feature-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: var(--ps-light-blue);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ps-deep-blue);
  font-size: 1.2rem;
}

.ps-feature-item h3 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.ps-feature-item p {
  font-size: 0.85rem;
  color: var(--ps-gray-text);
  line-height: 1.7;
}

/* ============================================
   Responsive Breakpoints (Mobile-First)
   320px -> 768px -> 1024px -> 1440px
   ============================================ */

/* Tablet (768px+) */
@media (min-width: 768px) {
  .ps-nav-inner {
    padding: 0.75rem 2rem;
  }

  .ps-hamburger {
    display: none;
  }

  .ps-nav-links {
    display: flex;
    flex-direction: row;
    gap: 0;
  }

  .ps-nav-link {
    padding: 0.5rem 0.75rem;
    font-size: 0.85rem;
    background: none;
  }

  .ps-nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--ps-glow-cyan);
    transition: width 0.3s ease;
  }

  .ps-nav-link:hover::after,
  .ps-nav-link.ps-active::after {
    width: 60%;
  }

  .ps-nav-link:hover {
    background: none;
  }

  .ps-nav-search {
    display: block;
  }

  .ps-hero-title {
    font-size: 2.8rem;
  }

  .ps-hero-subtitle {
    font-size: 1.15rem;
  }

  .ps-section {
    padding: 5rem 2rem;
  }

  .ps-section-title {
    font-size: 2rem;
  }

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

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

  .ps-philosophy {
    flex-direction: row;
  }

  .ps-philosophy-img {
    width: 45%;
  }

  .ps-interview {
    flex-direction: row;
  }

  .ps-interview-img {
    width: 40%;
  }

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

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

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

  .ps-waterfall {
    column-count: 2;
  }

  .ps-app-hero {
    flex-direction: row;
    text-align: left;
  }

  .ps-app-buttons {
    flex-direction: row;
  }

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

  .ps-page-header {
    height: 400px;
  }

  .ps-page-header-content h1 {
    font-size: 2.5rem;
  }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
  .ps-nav-link {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
  }

  .ps-hero-title {
    font-size: 3.2rem;
  }

  .ps-card-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .ps-gallery-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .ps-process {
    grid-template-columns: repeat(4, 1fr);
  }

  .ps-testimonials {
    grid-template-columns: repeat(3, 1fr);
  }

  .ps-footer-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .ps-waterfall {
    column-count: 3;
  }

  .ps-feature-list {
    grid-template-columns: repeat(3, 1fr);
  }

  .ps-page-header {
    height: 450px;
  }
}

/* Large Desktop (1440px+) */
@media (min-width: 1440px) {
  .ps-section {
    padding: 6rem 3rem;
  }

  .ps-hero-title {
    font-size: 3.6rem;
  }

  .ps-section-title {
    font-size: 2.4rem;
  }

  .ps-card-img {
    height: 280px;
  }

  .ps-gallery-item img {
    height: 320px;
  }
}

/* === Utility Classes === */
.ps-text-center { text-align: center; }
.ps-mt-2 { margin-top: 2rem; }
.ps-mb-2 { margin-bottom: 2rem; }
.ps-hidden { display: none; }