/**
 * visual-semantics.css — Water Intake Calculator v2.3
 * Full theme CSS: header → calculator → features → steps →
 * use cases → FAQ → CTA → footer
 * Fully responsive: 320px to 1400px+
 * Follows Koray Tugber GUBUR Visual Semantics framework
 */

/* ═══ SKIP LINK ═══ */
.skip-to-content {
  position:absolute; top:-100%; left:0; z-index:9999;
  background:var(--primary); color:#fff; padding:8px 16px;
  font-size:0.875rem; font-weight:600; text-decoration:none;
  border-radius:0 0 8px 0; transition:top 0.2s;
}
.skip-to-content:focus { top:0; }

/* ═══ HEADER — sticky, blur, language-aware ═══ */
.nav-link {
  font-size:0.875rem; font-weight:500; color:var(--text-secondary);
  padding:6px 12px; border-radius:var(--radius-sm);
  text-decoration:none; transition:all var(--transition); white-space:nowrap;
}
.nav-link:hover { color:var(--primary); background:var(--surface); }

/* Language switcher */
.lang-switcher { position:relative; }
.lang-btn {
  display:flex; align-items:center; gap:5px;
  background:none; border:1.5px solid var(--border);
  border-radius:var(--radius-sm); padding:5px 10px;
  font-size:0.8125rem; font-weight:500; color:var(--text-secondary);
  cursor:pointer; font-family:inherit; transition:all var(--transition); white-space:nowrap;
}
.lang-btn:hover { border-color:var(--primary); color:var(--primary); }
.lang-chevron { transition:transform 0.2s; }
.lang-btn[aria-expanded="true"] .lang-chevron { transform:rotate(180deg); }
.lang-dropdown {
  position:absolute; top:calc(100% + 8px); right:0;
  background:var(--white); border:1px solid var(--border);
  border-radius:var(--radius-md); box-shadow:var(--shadow-lg);
  min-width:160px; z-index:200; display:none; overflow:hidden;
}
.lang-dropdown.open { display:block; animation:slideDown 0.2s ease both; }
.lang-item {
  display:flex; align-items:center; padding:9px 16px;
  font-size:0.875rem; font-weight:500; color:var(--text-secondary);
  text-decoration:none; transition:all var(--transition);
  border-bottom:1px solid rgba(0,0,0,0.04);
}
.lang-item:last-child { border-bottom:none; }
.lang-item:hover { background:var(--surface); color:var(--primary); }
.lang-item.active { color:var(--primary); font-weight:700; background:rgba(0,150,199,0.06); }

/* ═══ BLOCK 1: HERO / CENTERPIECE ═══ */
.hero-section {
  background:linear-gradient(160deg,#E8F5FD 0%,#F0FAFF 50%,#E0F4F8 100%);
  padding:40px 0 56px; position:relative; overflow:hidden;
}
.hero-section::before {
  content:''; position:absolute; top:-80px; right:-80px;
  width:500px; height:500px; pointer-events:none;
  background:radial-gradient(circle,rgba(0,180,216,0.07) 0%,transparent 70%);
}
.hero-content { text-align:center; max-width:680px; margin:0 auto 32px; }
.hero-h1 {
  font-size:clamp(1.75rem,4.5vw,3rem); font-weight:800;
  line-height:1.1; letter-spacing:-0.03em; color:var(--text-primary); margin-bottom:16px;
}
.hero-desc {
  font-size:clamp(0.9375rem,2vw,1.0625rem); color:var(--text-secondary);
  line-height:1.7; max-width:560px; margin:0 auto 24px;
}
.trust-badges { display:flex; justify-content:center; flex-wrap:wrap; gap:8px; }
.trust-badge {
  font-size:0.8125rem; font-weight:600; color:var(--text-secondary);
  background:rgba(255,255,255,0.85); border:1px solid rgba(0,150,199,0.15);
  border-radius:100px; padding:5px 14px; white-space:nowrap;
}

/* ═══ FORM EXTENSIONS ═══ */
.form-optional { font-weight:400; color:var(--text-muted); font-size:0.8125rem; }
.form-help { font-size:0.8125rem; color:var(--text-muted); margin-bottom:12px; line-height:1.6; }

/* ═══ RESULTS PANEL RESET BUTTON ═══ */
.btn-reset {
  display:inline-flex; align-items:center; gap:6px; margin-top:24px;
  background:none; border:1.5px solid var(--border); color:var(--text-secondary);
  font-size:0.875rem; font-weight:600; padding:9px 18px;
  border-radius:var(--radius-sm); cursor:pointer; transition:all var(--transition); font-family:inherit;
}
.btn-reset:hover { border-color:var(--primary); color:var(--primary); background:var(--surface); }

/* ═══ EVIDENCE SOURCE BANNER — single line ═══ */
.sources-banner {
  background:#F0F8FF;
  border-top:1px solid var(--border);
  border-bottom:1px solid var(--border);
  padding:10px 0;
}
.sources-inner {
  display:flex; align-items:center; gap:8px;
  font-size:0.8rem; color:var(--text-muted);
  flex-wrap:nowrap; overflow:hidden;
}
.sources-label { font-weight:700; color:var(--text-secondary); white-space:nowrap; flex-shrink:0; }
.source-item { color:var(--text-secondary); white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }

/* ═══ SHARED SECTION STYLES ═══ */
.section-header { text-align:center; max-width:640px; margin:0 auto 48px; }
.section-header h2 {
  font-size:clamp(1.375rem,3vw,2.125rem); font-weight:800;
  letter-spacing:-0.025em; color:var(--text-primary); margin-bottom:12px;
}
.section-desc {
  font-size:clamp(0.9375rem,2vw,1.0625rem); color:var(--text-secondary); line-height:1.7;
}

/* ═══ BLOCK 2: FEATURES ═══ */
.features-section { background:var(--white); padding:72px 0; }
.features-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:20px; }
.feature-card {
  background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius-lg); padding:28px 24px; transition:all var(--transition);
}
.feature-card:hover { border-color:rgba(0,150,199,0.3); box-shadow:var(--shadow-md); transform:translateY(-2px); }
.feature-icon { font-size:1.75rem; margin-bottom:14px; line-height:1; display:block; }
.feature-card h3 { font-size:1rem; font-weight:700; color:var(--text-primary); margin-bottom:8px; line-height:1.3; }
.feature-card p { font-size:0.9375rem; color:var(--text-secondary); line-height:1.65; margin:0; }

/* ═══ BLOCK 3: STEPS ═══ */
.steps-section {
  background:linear-gradient(180deg,#F5FBFF 0%,#FFFFFF 100%);
  padding:72px 0; border-top:1px solid var(--border); border-bottom:1px solid var(--border);
}
.steps-list { list-style:none; max-width:760px; margin:0 auto; }
.step-item {
  display:flex; gap:24px; align-items:flex-start;
  padding:28px 0; border-bottom:1px solid var(--border);
}
.step-item:last-child { border-bottom:none; }
.step-number {
  width:48px; height:48px; flex-shrink:0;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  color:white; border-radius:50%; display:flex; align-items:center; justify-content:center;
  font-size:1.125rem; font-weight:800; font-family:var(--font-display);
}
.step-content { flex:1; min-width:0; }
.step-content h3 { font-size:1.0625rem; font-weight:700; color:var(--text-primary); margin-bottom:8px; }
.step-content p { font-size:0.9375rem; color:var(--text-secondary); line-height:1.65; margin:0; }
.steps-footer { text-align:center; margin-top:36px; font-size:0.9375rem; font-weight:600; color:var(--primary); }

/* ═══ BLOCK 4: USE CASES ═══ */
.usecases-section { background:var(--white); padding:72px 0; }
.usecases-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:20px; }
.usecase-card {
  background:linear-gradient(145deg,#F7FBFF,var(--white));
  border:1px solid var(--border); border-radius:var(--radius-lg);
  padding:28px 22px; text-align:center; transition:all var(--transition);
}
.usecase-card:hover { border-color:var(--primary-light); box-shadow:var(--shadow-md); transform:translateY(-2px); }
.usecase-icon { font-size:2rem; line-height:1; margin-bottom:14px; display:block; }
.usecase-card h3 { font-size:0.9375rem; font-weight:700; color:var(--text-primary); margin-bottom:10px; line-height:1.35; }
.usecase-card p { font-size:0.875rem; color:var(--text-secondary); line-height:1.65; margin:0; }
.usecases-footer { text-align:center; margin-top:40px; font-size:0.9375rem; color:var(--text-muted); font-style:italic; }

/* ═══ BLOCK 5: FAQ ═══ */
.faq-section { background:var(--surface); padding:72px 0; border-top:1px solid var(--border); }
.faq-tabs {
  display:flex; gap:4px; background:var(--white);
  border:1px solid var(--border); border-radius:var(--radius-md);
  padding:4px; margin-bottom:28px;
  overflow-x:auto; -webkit-overflow-scrolling:touch; scrollbar-width:none;
}
.faq-tabs::-webkit-scrollbar { display:none; }
.faq-tab {
  flex:1; min-width:120px; padding:9px 14px; background:none; border:none;
  border-radius:var(--radius-sm); font-size:0.875rem; font-weight:600;
  color:var(--text-muted); cursor:pointer; transition:all var(--transition);
  font-family:inherit; white-space:nowrap;
}
.faq-tab:hover { color:var(--primary); background:var(--surface); }
.faq-tab.active, .faq-tab[aria-selected="true"] { background:var(--primary); color:white; }
.faq-panel { display:none; }
.faq-panel:not([hidden]) { display:block; animation:fadeInUp 0.3s ease both; }
.faq-list { display:flex; flex-direction:column; gap:0; }
.faq-item {
  background:var(--white); border:1px solid var(--border);
  border-radius:var(--radius-md); margin-bottom:8px; overflow:hidden;
  transition:box-shadow var(--transition);
}
.faq-item[open] { box-shadow:var(--shadow-sm); }
.faq-item[open] .faq-question { color:var(--primary); }
.faq-question {
  display:flex; align-items:center; justify-content:space-between;
  padding:16px 20px; font-size:0.9375rem; font-weight:600;
  color:var(--text-primary); cursor:pointer; list-style:none;
  transition:color var(--transition); line-height:1.4; gap:12px;
}
.faq-question::-webkit-details-marker { display:none; }
.faq-question::after {
  content:'+'; font-size:1.25rem; font-weight:400; color:var(--primary);
  flex-shrink:0; line-height:1;
}
details[open] .faq-question::after { content:'−'; }
.faq-answer { padding:0 20px 18px; border-top:1px solid var(--surface-2); }
.faq-answer p { font-size:0.9375rem; color:var(--text-secondary); line-height:1.7; margin:0; padding-top:14px; }

/* ═══ BLOCK 6: CTA ═══ */
.cta-section { background:linear-gradient(135deg,var(--primary-dark),var(--primary)); padding:72px 0; }
.cta-inner { text-align:center; max-width:600px; margin:0 auto; }
.cta-inner h2 {
  font-size:clamp(1.375rem,3vw,2.25rem); font-weight:800;
  color:white; letter-spacing:-0.025em; margin-bottom:16px;
}
.cta-desc { font-size:1.0625rem; color:rgba(255,255,255,0.85); line-height:1.7; margin-bottom:32px; }
.btn-cta {
  display:inline-flex; align-items:center; gap:8px;
  background:white; color:var(--primary);
  font-size:1rem; font-weight:800; padding:16px 32px;
  border-radius:var(--radius-lg); text-decoration:none;
  transition:all var(--transition); box-shadow:0 4px 24px rgba(0,0,0,0.15);
  font-family:var(--font-display);
}
.btn-cta:hover { transform:translateY(-2px); box-shadow:0 8px 32px rgba(0,0,0,0.2); color:var(--primary-dark); }

/* ═══ FOOTER ═══ */
.site-footer { background:var(--text-primary); color:rgba(255,255,255,0.7); padding:56px 0 0; }
.footer-grid { display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:40px; margin-bottom:32px; }
.footer-logo { display:inline-flex; align-items:center; gap:10px; text-decoration:none; margin-bottom:16px; }
.footer-logo-icon { font-size:1.5rem; }
.footer-logo-text { font-size:0.9375rem; font-weight:700; color:white; }
.footer-desc { font-size:0.875rem; line-height:1.7; color:rgba(255,255,255,0.55); margin-bottom:8px; }
.footer-company { font-size:0.8125rem; color:rgba(255,255,255,0.35); margin-bottom:4px; }
.footer-contact a { font-size:0.8125rem; color:rgba(255,255,255,0.45); text-decoration:none; }
.footer-contact a:hover { color:rgba(255,255,255,0.8); }
.footer-nav-title { font-size:0.75rem; font-weight:700; letter-spacing:0.1em; text-transform:uppercase; color:white; margin-bottom:14px; }
.footer-nav ul { list-style:none; display:flex; flex-direction:column; gap:8px; }
.footer-nav ul li a { font-size:0.875rem; color:rgba(255,255,255,0.55); text-decoration:none; transition:color var(--transition); }
.footer-nav ul li a:hover { color:white; }
.footer-ymyl {
  background:rgba(0,0,0,0.15); border:1px solid rgba(255,255,255,0.06);
  border-radius:8px; padding:14px 18px; margin-bottom:24px;
}
.footer-ymyl p { font-size:0.8125rem; color:rgba(255,255,255,0.4); line-height:1.65; margin:0; }
.footer-ymyl strong { color:rgba(255,255,255,0.6); }
.footer-bottom {
  border-top:1px solid rgba(255,255,255,0.08); padding:24px 0;
  display:flex; flex-wrap:wrap; gap:12px; justify-content:space-between; align-items:center;
}
.footer-copyright { font-size:0.8125rem; color:rgba(255,255,255,0.45); margin:0; }

/* ═══ RTL SUPPORT (Arabic + Hebrew) ═══ */
[dir="rtl"] .hero-content,
[dir="rtl"] .section-header    { direction:rtl; }
[dir="rtl"] .calc-section-title,
[dir="rtl"] .form-label         { text-align:right; }
[dir="rtl"] .step-item          { flex-direction:row-reverse; }
[dir="rtl"] .sources-inner      { flex-direction:row-reverse; justify-content:flex-end; }
[dir="rtl"] .faq-question       { flex-direction:row-reverse; }
[dir="rtl"] .lang-dropdown      { right:auto; left:0; }
[dir="rtl"] .footer-grid        { direction:rtl; }
[dir="rtl"] .trust-badges       { direction:rtl; }
[dir="rtl"] .btn-reset          { flex-direction:row-reverse; }

/* ═══ RESPONSIVE — FULL BREAKPOINTS ═══ */

/* Tablet wide: 1100px */
@media (max-width:1100px) {
  .features-grid   { grid-template-columns:repeat(2,1fr); }
  .footer-grid     { grid-template-columns:1fr 1fr; gap:32px; }
  .footer-brand    { grid-column:1 / -1; }
}

/* Tablet: 900px */
@media (max-width:900px) {
  .usecases-grid { grid-template-columns:repeat(2,1fr); }

  /* Mobile nav */
  .site-nav {
    display:none; position:absolute; top:64px; left:0; right:0;
    background:white; border-bottom:1px solid var(--border);
    padding:12px; flex-direction:column; gap:4px;
    box-shadow:var(--shadow-md); z-index:100;
  }
  .site-nav.open { display:flex; }
  .nav-toggle { display:block; }

  /* Lang dropdown on mobile opens left-aligned */
  .lang-dropdown { right:auto; left:0; }
}

/* Mobile: 768px */
@media (max-width:768px) {
  .hero-section   { padding:24px 0 36px; }
  .hero-h1        { font-size:clamp(1.5rem,6vw,2rem); }
  .trust-badges   { gap:6px; }
  .trust-badge    { font-size:0.75rem; padding:4px 10px; }

  .features-section,
  .steps-section,
  .usecases-section,
  .faq-section    { padding:48px 0; }
  .cta-section    { padding:48px 0; }
  .section-header { margin-bottom:32px; }

  .features-grid  { grid-template-columns:1fr; gap:14px; }
  .feature-card   { padding:22px 18px; }

  .faq-tabs       { padding:3px; gap:2px; }
  .faq-tab        { min-width:0; padding:8px 10px; font-size:0.8125rem; flex:1; }

  .footer-grid    { grid-template-columns:1fr; gap:28px; }
  .footer-bottom  { flex-direction:column; text-align:center; gap:8px; }

  .cta-inner h2   { font-size:clamp(1.25rem,5vw,1.75rem); }
  .btn-cta        { font-size:0.9375rem; padding:14px 24px; }

  .steps-list     { padding:0; }
  .step-item      { gap:16px; padding:20px 0; }
  .step-number    { width:40px; height:40px; font-size:1rem; }
}

/* Small mobile: 560px */
@media (max-width:560px) {
  .usecases-grid  { grid-template-columns:1fr; gap:14px; }
  .sources-inner  { gap:6px; font-size:0.75rem; }
  .faq-question   { font-size:0.875rem; padding:14px 16px; }
  .faq-answer     { padding:0 16px 16px; }

  /* Stack form rows on tiny screens */
  .form-row       { grid-template-columns:1fr; }
  .btn-group      { gap:6px; }
  .btn-option     { padding:10px 8px; }

  .calc-card      { padding:20px 16px; }
  .results-grid   { grid-template-columns:1fr 1fr; gap:10px; }
}

/* Extra small: 380px */
@media (max-width:380px) {
  .container      { padding:0 14px; }
  .results-grid   { grid-template-columns:1fr; }
  .faq-tab        { font-size:0.75rem; padding:7px 8px; }
  .trust-badge    { font-size:0.7rem; padding:3px 8px; }
  .btn-cta        { padding:12px 18px; font-size:0.875rem; }
}

/* ═══ FOOTER LOGO — consistent SVG water drop (same as header) ═══ */
.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  margin-bottom: 16px;
}
.footer-logo .logo-icon {
  width: 36px; height: 36px; flex-shrink: 0;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
}

/* ═══ SOURCES BANNER — 3 items, single line desktop, wraps on mobile ═══ */
.sources-inner {
  flex-wrap: nowrap;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding-bottom: 2px;
}
.sources-inner::-webkit-scrollbar { display: none; }

@media (max-width: 640px) {
  .sources-inner {
    flex-wrap: wrap;
    gap: 6px;
  }
  .sources-label { width: 100%; margin-bottom: 2px; }
  .source-sep { display: none; }
  .source-item {
    font-size: 0.75rem;
    background: rgba(0,150,199,0.06);
    border-radius: 4px;
    padding: 2px 6px;
  }
}

/* ═══ FOOTER DISCLAIMER — responsive, reduced font, mobile-friendly ═══ */
.footer-ymyl {
  background: rgba(0,0,0,0.15);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 24px;
}
.footer-ymyl p {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.38);
  line-height: 1.6;
  margin: 0;
}
.footer-ymyl strong { color: rgba(255,255,255,0.55); }

@media (max-width: 768px) {
  .footer-ymyl { padding: 10px 14px; margin-bottom: 16px; }
  .footer-ymyl p { font-size: 0.6875rem; line-height: 1.55; }
}
@media (max-width: 480px) {
  .footer-ymyl p { font-size: 0.625rem; line-height: 1.5; }
}