/* ===================================================================
   OceanTech Light Premium — style.css
   Mohsen Abdolhosseini personal portfolio
=================================================================== */

/* ---------- Self-hosted fonts (no Google Fonts CDN dependency) ----------
   Both files are variable fonts — a single file covers every weight used
   on the site (400–800 for Vazirmatn, 400–700 for Inter). Vazirmatn is
   restricted to its Arabic/Persian glyph range and Inter to Latin, so
   Persian text always renders in Vazirmatn and Latin text/numbers always
   fall through to Inter, as intended by the font stack below. */
@font-face{
  font-family:'Vazirmatn';
  src:url('../fonts/Vazirmatn-Variable.woff2') format('woff2');
  font-weight:400 800;
  font-style:normal;
  font-display:swap;
  unicode-range:U+0600-06FF,U+0750-077F,U+0870-088E,U+0890-0891,U+0897-08E1,U+08E3-08FF,U+200C-200E,U+2010-2011,U+204F,U+2E41,U+FB50-FDFF,U+FE70-FE74,U+FE76-FEFC;
}
@font-face{
  font-family:'Inter';
  src:url('../fonts/Inter-Variable.woff2') format('woff2');
  font-weight:400 700;
  font-style:normal;
  font-display:swap;
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215;
}

/* ---------- Design tokens ---------- */
:root{
  --primary-blue:#2563EB;
  --secondary-cyan:#22D3EE;
  --accent-indigo:#818CF8;
  --bg:#FFFFFF;
  --bg-soft:#F8FAFC;
  --border:#E2E8F0;
  --text-heading:#0F172A;
  --text-paragraph:#334155;
  --text-muted:#64748B;
  --success:#10B981;
  --warning:#F59E0B;
  --error:#EF4444;
  --dark-bg:#0F172A;
  --dark-card:#1E293B;

  --radius-sm:8px;
  --radius-md:14px;
  --radius-lg:22px;
  --shadow-sm:0 1px 2px rgba(15,23,42,.06);
  --shadow-md:0 8px 24px rgba(15,23,42,.08);
  --shadow-lg:0 20px 45px rgba(15,23,42,.12);
  --transition:all .25s ease;
  --container-w:1180px;
}

[data-theme="dark"]{
  --bg:var(--dark-bg);
  --bg-soft:var(--dark-card);
  --border:#334155;
  --text-heading:#F8FAFC;
  --text-paragraph:#CBD5E1;
  --text-muted:#94A3B8;
  --shadow-sm:0 1px 2px rgba(0,0,0,.3);
  --shadow-md:0 8px 24px rgba(0,0,0,.35);
  --shadow-lg:0 20px 45px rgba(0,0,0,.45);
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Vazirmatn','Inter',sans-serif;
  background:var(--bg);
  color:var(--text-paragraph);
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
  transition:background-color .3s ease,color .3s ease;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button{font:inherit;background:none;border:none;cursor:pointer;color:inherit}
input,textarea{font:inherit;color:inherit}
h1,h2,h3,h4{color:var(--text-heading);font-weight:700;line-height:1.35}
.container{max-width:var(--container-w);margin:0 auto;padding:0 20px}

/* ---------- Section shell ---------- */
section{padding:88px 0}
.section-head{max-width:640px;margin:0 auto 48px;text-align:center}
.section-tag{
  display:inline-block;font-size:13px;font-weight:600;color:var(--primary-blue);
  background:color-mix(in srgb, var(--primary-blue) 12%, transparent);
  padding:6px 16px;border-radius:999px;margin-bottom:14px;
}
.section-head h2{font-size:clamp(24px,3vw,34px);margin-bottom:12px}
.section-head p{color:var(--text-muted);font-size:16px}
.bg-soft{background:var(--bg-soft)}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:14px 30px;border-radius:999px;font-weight:600;font-size:15px;
  transition:var(--transition);cursor:pointer;border:2px solid transparent;
  white-space:nowrap;
}
.btn-primary{
  background:linear-gradient(135deg,var(--primary-blue),var(--secondary-cyan));
  color:#fff;box-shadow:var(--shadow-md);
}
.btn-primary:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.btn-secondary{
  background:transparent;border-color:var(--border);color:var(--text-heading);
}
.btn-secondary:hover{border-color:var(--primary-blue);color:var(--primary-blue);transform:translateY(-3px)}
.btn-block{width:100%}

/* ---------- Navbar ---------- */
.navbar{
  position:sticky;top:0;z-index:100;width:100%;
  background:transparent;transition:var(--transition);
  border-bottom:1px solid transparent;
}
.navbar.scrolled{
  background:color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter:blur(12px);
  border-bottom-color:var(--border);
  box-shadow:var(--shadow-sm);
}
.navbar-inner{display:flex;align-items:center;justify-content:space-between;height:76px}
.navbar-brand{font-weight:800;font-size:18px;color:#5B8DEF;letter-spacing:.2px}
.navbar-nav ul{display:flex;gap:34px}
.navbar-nav a{
  font-size:15px;font-weight:500;color:var(--text-paragraph);position:relative;
  transition:var(--transition);
}
.navbar-nav a::after{
  content:"";position:absolute;bottom:-6px;right:0;width:0;height:2px;
  background:var(--primary-blue);transition:var(--transition);
}
.navbar-nav a:hover{color:var(--primary-blue)}
.navbar-nav a:hover::after{width:100%}
.navbar-user{font-size:14px;font-weight:500;color:var(--text-muted)}
.navbar-nav a.navbar-cta{
  color:#fff;background:linear-gradient(135deg,var(--primary-blue),var(--secondary-cyan));
  padding:8px 18px;border-radius:999px;font-weight:600;
}
.navbar-nav a.navbar-cta::after{display:none}
.navbar-nav a.navbar-cta:hover{color:#fff;opacity:.9}
.navbar-actions{display:flex;align-items:center;gap:10px}

.navbar-name{
  font-family:'Inter',sans-serif;font-size:14px;font-weight:600;color:#000;
  white-space:nowrap;
}
[data-theme="dark"] .navbar-name{color:var(--text-heading)}

.theme-toggle,.nav-toggle{
  width:42px;height:42px;display:flex;align-items:center;justify-content:center;
  border-radius:50%;border:1px solid var(--border);color:var(--text-heading);
  transition:var(--transition);
}
.theme-toggle:hover,.nav-toggle:hover{border-color:var(--primary-blue);color:var(--primary-blue)}
.theme-toggle .icon{width:20px;height:20px}
.theme-toggle .icon-moon{display:none}
[data-theme="dark"] .theme-toggle .icon-sun{display:none}
[data-theme="dark"] .theme-toggle .icon-moon{display:block}
.nav-toggle{display:none}
.nav-toggle svg{width:22px;height:22px}

@media (max-width:860px){
  .navbar-nav{
    position:fixed;inset-inline:0;top:76px;background:var(--bg);
    border-bottom:1px solid var(--border);box-shadow:var(--shadow-md);
    transform:translateY(-12px);opacity:0;pointer-events:none;transition:var(--transition);
  }
  .navbar-nav.open{transform:translateY(0);opacity:1;pointer-events:auto}
  .navbar-nav ul{flex-direction:column;gap:0;padding:12px 20px}
  .navbar-nav li{border-bottom:1px solid var(--border)}
  .navbar-nav a{display:block;padding:14px 0}
  .nav-toggle{display:flex}
}

/* ---------- Hero ---------- */
.hero{padding:70px 0 100px}
.hero-inner{
  display:grid;grid-template-columns:1fr;gap:48px;align-items:center;text-align:center;
}
.hero-photo-wrap{
  justify-self:center;width:240px;height:240px;border-radius:50%;
  padding:8px;background:linear-gradient(135deg,var(--primary-blue),var(--secondary-cyan),var(--accent-indigo));
  animation:fadeIn 1s ease both;
}
.hero-photo-wrap img{
  width:100%;height:100%;border-radius:50%;object-fit:cover;border:4px solid var(--bg);
  filter:grayscale(100%);transition:filter .4s ease;
}
.hero-photo-wrap:hover img{filter:grayscale(0%)}
.hero-eyebrow{
  display:inline-block;font-size:13px;font-weight:600;color:var(--primary-blue);
  background:color-mix(in srgb, var(--primary-blue) 12%, transparent);
  padding:6px 16px;border-radius:999px;margin-bottom:18px;
}
.hero-title{font-size:clamp(26px,4vw,42px);margin-bottom:16px}
.hero-title span{
  background:linear-gradient(135deg,var(--primary-blue),var(--secondary-cyan));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-subtitle{font-size:clamp(16px,2vw,20px);color:var(--text-paragraph);margin-bottom:14px;font-weight:600}
.hero-desc{color:var(--text-muted);font-size:15px;max-width:520px;margin:0 auto 30px}
.hero-ctas{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

@keyframes fadeIn{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:translateY(0)}}

@media (min-width:860px){
  .hero-inner{
    grid-template-columns:260px 1fr;text-align:right;
    max-width:900px;margin-left:auto;margin-right:0;
  }
  .hero-photo-wrap{width:260px;height:260px;justify-self:start}
  .hero-ctas{justify-content:flex-start}
  .hero-desc{margin:0 0 30px}
}

/* ---------- Article categories (entry tiles) ---------- */
.category-grid{display:grid;grid-template-columns:1fr;gap:24px;margin-bottom:44px}
.category-card{
  display:flex;flex-direction:column;align-items:flex-start;
  background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:22px 20px;transition:var(--transition);cursor:pointer;text-align:right;width:100%;
}
.category-card:hover,.category-card:focus-visible{
  transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:var(--primary-blue);
}
.category-card:focus-visible{outline:2px solid var(--primary-blue);outline-offset:3px}
.category-card.is-active{border-color:var(--primary-blue);box-shadow:var(--shadow-lg)}
.category-icon{
  width:46px;height:46px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,color-mix(in srgb, var(--primary-blue) 15%, transparent),color-mix(in srgb, var(--secondary-cyan) 15%, transparent));
  color:var(--primary-blue);margin-bottom:16px;
}
.category-icon svg{width:24px;height:24px}
.category-card h3{font-size:16px;margin-bottom:14px}
.category-enter{
  display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--primary-blue);
  margin-top:auto;
}
.category-enter svg{width:16px;height:16px;transition:transform .25s ease}
.category-card:hover .category-enter svg,.category-card:focus-visible .category-enter svg{transform:translateX(-4px)}

@media (min-width:640px){.category-grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:980px){.category-grid{grid-template-columns:repeat(3,1fr)}}

/* ---------- Filtered article results ---------- */
.articles-results{border-top:1px solid var(--border);padding-top:40px}
.results-prompt{
  text-align:center;padding:40px 24px;color:var(--text-muted);
}
.results-prompt svg{width:40px;height:40px;margin:0 auto 14px;color:var(--text-muted)}
.results-header{
  display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:28px;
}
.results-header h3{font-size:20px}
.results-back{
  display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;
  color:var(--text-muted);transition:var(--transition);
}
.results-back:hover{color:var(--primary-blue)}
.results-back svg{width:16px;height:16px}

.article-grid{display:grid;grid-template-columns:1fr;gap:24px}
.article-card{
  background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-lg);
  overflow:hidden;transition:var(--transition);display:flex;flex-direction:column;
}
.article-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.article-thumb{aspect-ratio:16/9;overflow:hidden;background:var(--bg-soft)}
.article-thumb img{width:100%;height:100%;object-fit:cover}
.article-card-body{padding:22px;display:flex;flex-direction:column;gap:10px;flex:1}
.article-card-body h3{font-size:17px}
.article-card-body p{color:var(--text-muted);font-size:14px;flex:1}
.article-card-body .btn{align-self:flex-start;padding:10px 22px;font-size:14px;margin-top:6px}

@media (min-width:640px){.article-grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:980px){.article-grid{grid-template-columns:repeat(3,1fr)}}

.articles-empty{
  text-align:center;padding:60px 24px;border:1px dashed var(--border);
  border-radius:var(--radius-lg);background:var(--bg-soft);
}
.articles-empty svg{width:48px;height:48px;color:var(--text-muted);margin:0 auto 18px}
.articles-empty h3{font-size:19px;margin-bottom:8px}
.articles-empty p{color:var(--text-muted);max-width:420px;margin:0 auto}

/* ---------- Videos ---------- */
.video-grid{display:grid;grid-template-columns:1fr;gap:24px}
.video-wrapper{
  position:relative;width:100%;aspect-ratio:16/9;border-radius:var(--radius-lg);
  overflow:hidden;border:1px solid var(--border);box-shadow:var(--shadow-sm);background:#000;
}
.video-wrapper iframe,.video-wrapper video{position:absolute;inset:0;width:100%;height:100%;border:0;background:#000}

@media (min-width:640px){.video-grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:980px){.video-grid{grid-template-columns:repeat(3,1fr)}}

/* ---------- Auth pages (register / login) ---------- */
.auth-section{padding:70px 0 90px}
.auth-switch{text-align:center;margin-top:20px;color:var(--text-muted);font-size:14px}
.auth-switch a{color:var(--primary-blue);font-weight:600}

/* ---------- Generic card (dashboard, admin login) ---------- */
.card{
  background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:36px;box-shadow:var(--shadow-sm);
}

/* ---------- Social links (contact section) ---------- */
.social-links{display:flex;gap:12px;margin-bottom:26px}
.social-links a{
  width:44px;height:44px;display:flex;align-items:center;justify-content:center;
  border-radius:50%;border:1px solid var(--border);color:var(--text-heading);transition:var(--transition);
}
.social-links a:hover{border-color:var(--primary-blue);color:var(--primary-blue);transform:translateY(-3px)}
.social-links svg{width:20px;height:20px}

/* ---------- Contact ---------- */
.contact-wrap{max-width:640px;margin:0 auto}
.alert{
  padding:16px 20px;border-radius:var(--radius-md);margin-bottom:24px;font-size:14px;font-weight:500;
  border:1px solid transparent;
}
.alert-success{background:color-mix(in srgb, var(--success) 12%, transparent);color:var(--success);border-color:color-mix(in srgb, var(--success) 30%, transparent)}
.alert-error{background:color-mix(in srgb, var(--error) 12%, transparent);color:var(--error);border-color:color-mix(in srgb, var(--error) 30%, transparent)}

.contact-form{
  background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:36px;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;gap:20px;
}
.form-group{display:flex;flex-direction:column;gap:8px}
.form-group label{font-size:14px;font-weight:600;color:var(--text-heading)}
.form-group input,.form-group textarea{
  padding:13px 16px;border:1px solid var(--border);border-radius:var(--radius-sm);
  background:var(--bg-soft);color:var(--text-heading);transition:var(--transition);
}
.form-group textarea{resize:vertical;min-height:130px}
.form-group input:focus,.form-group textarea:focus{
  outline:none;border-color:var(--primary-blue);
  box-shadow:0 0 0 3px color-mix(in srgb, var(--primary-blue) 18%, transparent);
}
.form-group.field-error input,.form-group.field-error textarea{border-color:var(--error)}
.field-error-msg{font-size:13px;color:var(--error);display:none}
.form-group.field-error .field-error-msg{display:block}

/* Honeypot: visually hidden but present in the DOM/tab order excluded via tabindex="-1" */
.hp-field{position:absolute;left:-9999px;top:-9999px;width:1px;height:1px;overflow:hidden}

/* ---------- Footer ---------- */
.site-footer{background:var(--bg-soft);border-top:1px solid var(--border);padding-top:64px}
.footer-inner{display:grid;grid-template-columns:1fr;gap:36px;padding-bottom:40px}
.footer-brand{font-size:18px;margin-bottom:12px}
.footer-desc{color:var(--text-muted);font-size:14px;margin-bottom:14px}
.footer-bio{color:var(--text-muted);font-size:14px;max-width:480px}
.footer-col h4{font-size:15px;margin-bottom:16px}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-links a,.footer-col p a{color:var(--text-muted);font-size:14px;transition:var(--transition)}
.footer-links a:hover,.footer-col p a:hover{color:var(--primary-blue)}
.footer-bottom{
  border-top:1px solid var(--border);padding:22px 0;text-align:center;
  color:var(--text-muted);font-size:13px;
}

@media (min-width:768px){.footer-inner{grid-template-columns:2fr 1fr 1fr}}

/* ---------- Utilities ---------- */
.text-center{text-align:center}
.ltr-inline{unicode-bidi:isolate;direction:ltr;display:inline-block}

/* ---------- Mobile tuning (phones) ---------- */
@media (max-width:640px){
  .container{padding:0 16px}
  section{padding:52px 0}
  .section-head{margin-bottom:32px}
  .section-head h2{font-size:22px}
  .section-head p{font-size:14px}

  .navbar-inner{height:64px}
  .navbar-brand{
    font-size:14px;max-width:34vw;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
  }
  .navbar-name{font-size:11px}
  .navbar-actions{gap:8px}
  .theme-toggle,.nav-toggle{width:38px;height:38px}
  .navbar-nav{top:64px}

  .hero{padding:40px 0 56px}
  .hero-photo-wrap{width:180px;height:180px}
  .hero-title{font-size:24px}
  .hero-subtitle{font-size:15px}
  .hero-desc{font-size:14px}
  .hero-ctas{width:100%}
  .hero-ctas .btn{flex:1;padding:12px 20px;font-size:14px}

  .category-grid{gap:16px}
  .category-card{padding:18px 16px}
  .article-grid,.video-grid{gap:16px}

  .contact-form{padding:22px}

  .footer-inner{gap:28px}
  .site-footer{padding-top:44px}
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
}