/* ═══ FONTS ═══ */
@font-face{font-family:'Phudu';src:url('https://kth-electric.com/wp-content/fonts/DT-Phudu/DTPhudu-Bold.woff') format('woff');font-weight:700;font-style:normal;font-display:swap}
@font-face{font-family:'Ganh';src:url('https://kth-electric.com/wp-content/fonts/Ganh/Ganh%20Type-Regular.otf') format('opentype');font-weight:400;font-style:normal;font-display:swap}

/* ═══ DESIGN TOKENS ═══ */
:root{
  --bg:#f0f4f3;--text:#1e293b;--card:#fff;--border:#e2e8f0;
  --primary:#0f7c78;--primary-dark:#084c4a;--primary-light:#a7f3d0;
  --secondary:#00be63;--accent:#d35400;--accent-light:#fff3e0;
  --good:#2e7d32;--bad:#7b1fa2;--warn:#f57f17;
  --radius:16px;--shadow:0 8px 32px rgba(15,124,120,.12);
  --font-head:'Phudu',sans-serif;--font-body:'Ganh',sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font-body);background:var(--bg);color:var(--text);line-height:1.6}
h1,h2,h3,h4,.brand-font{font-family:var(--font-head)}
img{max-width:100%;height:auto}

/* ═══ LAYOUT ═══ */
.container{max-width:1100px;margin:0 auto;padding:0 clamp(12px,3vw,24px)}

/* ═══ HEADER ═══ */
.site-header{background:#fff;padding:12px 0;box-shadow:0 2px 8px rgba(0,0,0,.06);position:sticky;top:0;z-index:100}
.site-header .container{display:flex;justify-content:space-between;align-items:center}
.logo{font-family:var(--font-head);font-size:1.4rem;font-weight:700;color:var(--primary);text-decoration:none;display:flex;align-items:center;gap:8px}
.logo span{color:#333}
.header-nav{display:flex;gap:clamp(10px,2vw,20px);flex-wrap:wrap}
.header-nav a{text-decoration:none;color:#64748b;font-weight:600;font-size:.9rem;transition:color .2s;white-space:nowrap}
.header-nav a:hover{color:var(--primary)}

/* ═══ HERO ═══ */
.hero{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);color:#fff;padding:clamp(40px,6vw,70px) 0 clamp(60px,8vw,90px);text-align:center;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;inset:0;background-image:url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23ffffff' fill-opacity='0.06'%3E%3Cpath d='M20 20c0-5.5-4.5-10-10-10S0 14.5 0 20s4.5 10 10 10 10-4.5 10-10zm20 0c0-5.5-4.5-10-10-10s-10 4.5-10 10 4.5 10 10 10 10-4.5 10-10z'/%3E%3C/g%3E%3C/svg%3E");opacity:.4}
.hero h1{font-size:clamp(1.8rem,4vw,2.6rem);margin-bottom:10px;position:relative;z-index:2}
.hero h1 em{font-style:normal;color:var(--primary-light)}
.hero p{font-size:clamp(.95rem,2vw,1.15rem);opacity:.9;max-width:550px;margin:0 auto;position:relative;z-index:2}
.trust-badge{display:inline-flex;align-items:center;gap:8px;margin-top:14px;font-size:.9rem;background:rgba(0,0,0,.15);padding:6px 16px;border-radius:50px;backdrop-filter:blur(4px);border:1px solid rgba(255,255,255,.15);position:relative;z-index:2}
.trust-badge .stars{color:#fbbf24;letter-spacing:2px}

/* ═══ CONVERTER CARD ═══ */
.converter{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:clamp(20px,4vw,36px);margin-top:-50px;position:relative;z-index:10;max-width:680px;margin-left:auto;margin-right:auto;border:1px solid var(--border)}
.input-row{display:grid;grid-template-columns:1fr 1.3fr 1fr auto;gap:12px;margin-bottom:20px;align-items:end}
.field label{display:block;margin-bottom:6px;font-weight:600;color:#475569;font-size:.85rem}
.field select,.field input{width:100%;padding:11px 12px;border:2px solid var(--border);border-radius:10px;font-size:1rem;font-family:var(--font-body);outline:none;transition:border-color .2s;background:#fff;appearance:none;-webkit-appearance:none}
.field select{background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23475569' d='M6 8L1 3h10z'/%3E%3C/svg%3E") no-repeat right 12px center #fff;padding-right:32px}
.field select:focus,.field input:focus{border-color:var(--primary)}
.btn-today{padding:11px 16px;border:2px solid var(--primary);background:transparent;color:var(--primary);border-radius:10px;font-weight:700;cursor:pointer;font-family:var(--font-body);transition:.2s;white-space:nowrap;font-size:.9rem}
.btn-today:hover{background:var(--primary);color:#fff}
.btn-convert{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;border:none;width:100%;padding:14px;border-radius:12px;font-size:1.05rem;font-weight:700;cursor:pointer;transition:.3s;font-family:var(--font-head);text-transform:uppercase;letter-spacing:1px}
.btn-convert:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(15,124,120,.35)}
.btn-convert:active{transform:translateY(0)}
.quick-link{display:block;text-align:center;margin-top:14px;color:var(--primary);font-weight:600;text-decoration:none;font-size:.9rem}
.quick-link:hover{text-decoration:underline}

/* ═══ RESULT SECTION ═══ */
.result-section{max-width:900px;margin:clamp(24px,4vw,40px) auto;opacity:0;transform:translateY(16px);transition:all .5s ease;pointer-events:none}
.result-section.show{opacity:1;transform:translateY(0);pointer-events:auto}

/* Visual Calendar Card */
.calendar-visual{display:grid;grid-template-columns:1fr 1fr;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--border);margin-bottom:24px}
.cal-side{padding:clamp(20px,3vw,32px);text-align:center;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px}
.cal-solar{background:#fff}
.cal-lunar{background:var(--accent-light)}
.cal-label{font-size:.8rem;font-weight:700;text-transform:uppercase;letter-spacing:2px;color:#64748b}
.cal-number{font-size:clamp(3.5rem,8vw,5.5rem);font-weight:700;font-family:var(--font-head);line-height:1}
.cal-solar .cal-number{color:var(--accent)}
.cal-lunar .cal-number{color:var(--good)}
.cal-sub{font-size:clamp(.85rem,1.5vw,1rem);color:#5d4037;font-weight:600}
.cal-detail{font-size:.85rem;color:#8d6e63;margin-top:4px}
.cal-header{grid-column:1/-1;background:var(--primary);color:#fff;padding:10px;text-align:center;font-family:var(--font-head);font-size:1.1rem}

/* Day Quality Badge */
.quality-badge{display:inline-flex;align-items:center;gap:6px;padding:6px 16px;border-radius:50px;font-weight:700;font-size:.9rem;margin-top:8px}
.quality-good{background:#e8f5e9;color:var(--good)}
.quality-bad{background:#fce4ec;color:#c62828}
.quality-mid{background:#fff8e1;color:var(--warn)}

/* Info Grid */
.info-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin-bottom:24px}
.info-card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:16px;transition:box-shadow .2s}
.info-card:hover{box-shadow:0 4px 12px rgba(0,0,0,.08)}
.info-card .ic-label{font-size:.78rem;color:#8d6e63;text-transform:uppercase;letter-spacing:.5px;margin-bottom:4px;font-weight:600}
.info-card .ic-value{font-weight:700;color:#1e293b;font-size:.95rem}
.info-card.highlight{background:linear-gradient(135deg,#e8f5e9,#c8e6c9);border-color:#a5d6a7}
.info-card.warn{background:linear-gradient(135deg,#fff3e0,#ffe0b2);border-color:#ffcc80}
.info-card.danger{background:linear-gradient(135deg,#fce4ec,#f8bbd0);border-color:#f48fb1}

/* Hoang Dao Hours Grid */
.hours-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:8px;margin-bottom:24px}
.hour-chip{text-align:center;padding:10px 4px;border-radius:10px;font-size:.82rem;font-weight:600;border:1px solid var(--border);background:#fff}
.hour-chip.good{background:#e8f5e9;border-color:#a5d6a7;color:var(--good)}
.hour-chip .h-name{font-weight:700;display:block;font-size:.9rem}
.hour-chip .h-time{font-size:.72rem;color:#666;display:block}

/* ═══ MONTHLY CALENDAR ═══ */
.month-section{max-width:900px;margin:0 auto clamp(24px,4vw,40px)}
.month-header{display:flex;justify-content:space-between;align-items:center;background:var(--primary);color:#fff;padding:12px 20px;border-radius:var(--radius) var(--radius) 0 0}
.month-header h3{font-size:1.1rem;margin:0}
.month-nav{background:none;border:none;color:#fff;font-size:1.4rem;cursor:pointer;padding:4px 10px;border-radius:8px;transition:.2s}
.month-nav:hover{background:rgba(255,255,255,.2)}
.month-grid{display:grid;grid-template-columns:repeat(7,1fr);border:1px solid var(--primary);border-top:none;background:var(--border);gap:1px;border-radius:0 0 var(--radius) var(--radius);overflow:hidden}
.mg-head{background:var(--primary-dark);color:#fff;text-align:center;padding:8px 4px;font-size:.78rem;font-weight:700}
.mg-cell{background:#fff;padding:clamp(6px,1vw,12px);min-height:60px;cursor:pointer;transition:background .15s;position:relative}
.mg-cell:hover{background:#e0f2f1}
.mg-cell.today{background:#e8f5e9;box-shadow:inset 0 0 0 2px var(--primary)}
.mg-cell.empty{background:#fafafa;cursor:default}
.mg-cell.selected{background:#b2dfdb}
.mg-solar{font-weight:700;font-size:clamp(.85rem,1.5vw,1.05rem);color:#333}
.mg-solar.sun{color:var(--accent)}
.mg-solar.sat{color:var(--primary)}
.mg-lunar{font-size:.7rem;color:#888;margin-top:2px}
.mg-lunar.first{color:red;font-weight:700}
.mg-dot{position:absolute;top:4px;right:4px;width:6px;height:6px;border-radius:50%}
.mg-dot.good{background:var(--good)}
.mg-dot.bad{background:var(--bad)}

/* ═══ CONTENT ═══ */
.content-area{max-width:800px;margin:0 auto clamp(24px,4vw,40px)}
.content-area h2{font-size:clamp(1.3rem,3vw,1.7rem);margin:clamp(24px,4vw,40px) 0 16px;color:#333}
.content-area h3{font-size:1.2rem;margin:20px 0 10px;color:var(--primary)}
.content-area p{margin-bottom:12px;color:#475569}
.content-area ul{padding-left:20px;margin-bottom:16px}
.content-area li{margin-bottom:6px;color:#475569}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:20px;margin-bottom:12px}
.faq-item h4{margin:0 0 8px;color:var(--primary);font-size:1.05rem}
.faq-item p{margin:0;font-size:.95rem}

/* Disclaimer */
.disclaimer{background:#fffbeb;padding:20px;border-radius:12px;border-left:4px solid #fbbf24;margin-bottom:24px;font-size:.85rem;color:#666;line-height:1.7}
.disclaimer h3{font-size:1rem;font-weight:700;margin-bottom:10px;color:#333}
.disclaimer a{color:var(--primary)}

/* Related Tools */
.related-section{margin:clamp(30px,5vw,60px) auto;max-width:1000px}
.related-section h2{text-align:center;color:var(--primary);margin-bottom:24px}
.related-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}
.related-card{background:var(--card);border:1px solid var(--border);padding:24px;border-radius:var(--radius);text-align:center;text-decoration:none;color:inherit;transition:.3s;display:block}
.related-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.related-card i{font-size:2.2rem;margin-bottom:12px;display:block}
.related-card h3{font-size:1rem;margin-bottom:4px}
.related-card p{color:#64748b;font-size:.85rem;margin:0}

/* Footer */
.site-footer{background:#fff;padding:20px 0;text-align:center;border-top:1px solid #eee;font-size:.9rem;color:#64748b}
.footer-links{margin-top:12px;display:flex;justify-content:center;gap:16px;flex-wrap:wrap}
.footer-links a{color:#64748b;text-decoration:none;transition:.2s}
.footer-links a:hover{color:var(--primary)}

/* ═══ RESPONSIVE ═══ */
@media(max-width:768px){
  .input-row{grid-template-columns:1fr 1fr;gap:10px}
  .input-row .field:nth-child(2){grid-column:span 2}
  .calendar-visual{grid-template-columns:1fr}
  .hours-grid{grid-template-columns:repeat(3,1fr)}
  .info-grid{grid-template-columns:1fr 1fr}
  .header-nav{display:none}
  .month-grid .mg-cell{min-height:48px;padding:4px}
  .mg-lunar{font-size:.6rem}
}
@media(max-width:480px){
  .input-row{grid-template-columns:1fr}
  .input-row .field:nth-child(2){grid-column:auto}
  .info-grid{grid-template-columns:1fr}
  .hours-grid{grid-template-columns:repeat(3,1fr)}
  .converter{margin-top:-30px;padding:16px}
}