/* ============================================
   NHA KHOA THÚY ĐỨC - LANDING PAGE STYLE
   Summer 2026 — Mobile-first
   ============================================ */

:root {
    --primary: #0F4FAF;
    --primary-dark: #023076;
    --primary-deep: #194893;
    --primary-light: #3471D4;
    --primary-surface: #E0F0FE;
    --gold: #C78D3D;
    --gold-light: #EDCC82;
    --gold-gradient: linear-gradient(96deg, #EDCC82 -51.65%, #C78D3D 77.58%);
    --white: #FFFFFF;
    --gray-50: #F9FAFB;
    --gray-100: #F4F4F4;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;
    --text: #333333;
    --text-light: #6B7280;
    --green: #10B981;
    --red: #EF4444;
    --shadow: 0 4px 6px -1px rgba(0,0,0,.08), 0 2px 4px -2px rgba(0,0,0,.05);
    --shadow-md: 0 10px 15px -3px rgba(0,0,0,.08), 0 4px 6px -4px rgba(0,0,0,.05);
    --shadow-lg: 0 20px 25px -5px rgba(0,0,0,.1), 0 8px 10px -6px rgba(0,0,0,.08);
    --shadow-xl: 0 25px 50px -12px rgba(0,0,0,.18);
    --shadow-gold: 0 4px 20px rgba(199,141,61,.35);
    --container: 1200px;
    --header-h: 60px;
    --radius: 5px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --ease: cubic-bezier(.25,.46,.45,.94);
    --transition: .3s var(--ease);
}

/* === RESET === */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h)+16px);-webkit-font-smoothing:antialiased}
body{font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;font-size:15px;line-height:1.6;color:var(--text);background:var(--white);overflow-x:hidden;padding-bottom:68px}
img{max-width:100%;height:auto;display:block}
a{text-decoration:none;color:inherit;transition:var(--transition)}
ul,ol{list-style:none}

/* === UTILITIES === */
.container{max-width:var(--container);margin:0 auto;padding:0 16px}
.text-gold{background:var(--gold-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.required{color:var(--red)}
.check{color:var(--green);font-weight:700;flex-shrink:0}

/* === BUTTONS === */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:12px 24px;font-family:inherit;font-size:14px;font-weight:600;border-radius:var(--radius);border:none;cursor:pointer;transition:all var(--transition);white-space:nowrap;text-align:center}
.btn--primary{background:var(--primary);color:var(--white)}
.btn--primary:hover{background:var(--primary-dark);transform:translateY(-1px)}
.btn--gold{background:var(--gold-gradient);color:var(--white);box-shadow:var(--shadow-gold)}
.btn--gold:hover{filter:brightness(1.1);transform:translateY(-2px)}
.btn--outline-white{background:rgba(255,255,255,.12);color:var(--white);border:2px solid rgba(255,255,255,.5);backdrop-filter:blur(8px)}
.btn--outline-white:hover{background:rgba(255,255,255,.25);border-color:#fff}
.btn--lg{padding:14px 28px;font-size:15px}
.btn--full{width:100%}

/* === SECTION HEADERS === */
.section-header{text-align:center;margin-bottom:32px}
.section-header--left{text-align:left}
.section-tag{display:inline-block;padding:5px 14px;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:1.5px;color:var(--primary);background:var(--primary-surface);border-radius:50px;margin-bottom:10px}
.section-tag--light{background:rgba(237,204,130,.15);color:var(--gold-light)}
.section-title{font-size:24px;font-weight:800;line-height:1.2;color:var(--gray-900);margin-bottom:8px}
.section-title--light{color:#fff}
.section-desc{font-size:15px;color:var(--text-light);max-width:560px;margin:0 auto}
.section-desc--light{color:rgba(255,255,255,.75)}
.section-header--light .section-tag{background:rgba(237,204,130,.15);color:var(--gold-light)}

@media(min-width:768px){
    .container{padding:0 24px}
    .section-title{font-size:32px}
}

/* ============================================
   HEADER — compact mobile
   ============================================ */
.header{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(255,255,255,.95);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid rgba(0,0,0,.06)}
.header.scrolled{box-shadow:var(--shadow-md)}
.header__inner{max-width:var(--container);margin:0 auto;padding:0 16px;height:var(--header-h);display:flex;align-items:center;justify-content:space-between;gap:12px}
.header__logo img{height:38px;width:auto}
.header__actions{display:flex;align-items:center;gap:10px}
.header__phone{display:none;align-items:center;gap:5px;font-size:13px;font-weight:600;color:var(--primary)}
.header__cta{font-size:12px;padding:8px 16px}
@media(min-width:640px){
    .header__phone{display:flex}
    .header__logo img{height:44px}
}

/* ============================================
   HERO — mobile-first
   ============================================ */
.hero{position:relative;padding-top:160px;padding-bottom:40px;overflow:hidden}
.hero__bg{position:absolute;inset:0;z-index:0}
.hero__gradient{position:absolute;inset:0;background:linear-gradient(135deg,var(--primary-dark) 0%,var(--primary) 40%,var(--primary-deep) 80%)}
.hero__gradient::before{content:'';position:absolute;top:-40%;right:-20%;width:70%;height:130%;background:radial-gradient(ellipse,rgba(237,204,130,.1) 0%,transparent 70%);animation:heroGlow 8s ease-in-out infinite}
@keyframes heroGlow{0%,100%{transform:translate(0,0) scale(1);opacity:.7}50%{transform:translate(-5%,5%) scale(1.1);opacity:1}}

.hero__inner{position:relative;z-index:1;display:flex;flex-direction:column;gap:24px}
.hero__content{color:#fff}
.hero__badge{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;background:rgba(237,204,130,.15);border:1px solid rgba(237,204,130,.3);border-radius:50px;font-size:12px;font-weight:500;color:var(--gold-light);margin-bottom:16px;animation:fadeInUp .6s var(--ease) both}
.hero__badge-icon{animation:sparkle 2s ease-in-out infinite}
@keyframes sparkle{0%,100%{transform:scale(1) rotate(0);opacity:1}50%{transform:scale(1.3) rotate(180deg);opacity:.7}}
.hero__title{font-size:30px;font-weight:900;line-height:1.1;margin-bottom:10px;animation:fadeInUp .6s var(--ease) .1s both}
.hero__title-line1{display:block}
.hero__title-highlight{display:block;background:var(--gold-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero__subtitle{font-size:16px;font-weight:600;opacity:.9;margin-bottom:8px;animation:fadeInUp .6s var(--ease) .2s both}
.hero__desc{font-size:14px;opacity:.75;margin-bottom:20px;animation:fadeInUp .6s var(--ease) .3s both}
.hero__actions{display:flex;flex-wrap:wrap;gap:10px;animation:fadeInUp .6s var(--ease) .4s both}
.hero__visual{animation:fadeInUp .6s var(--ease) .3s both}
.hero__image-wrapper{border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-xl)}
.hero__image{width:100%;display:block}

@media(min-width:768px){
    .hero{padding:200px 0 60px}
    .hero__inner{flex-direction:row;align-items:center;gap:40px}
    .hero__content{flex:1}
    .hero__visual{flex:1}
    .hero__title{font-size:42px}
}

@keyframes fadeInUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}

/* ============================================
   PROMOTIONS
   ============================================ */
.promos{padding:48px 0;background:var(--gray-50);position:relative}
.promos::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:var(--gold-gradient)}

.promo-grid{display:flex;flex-direction:column;gap:16px}
@media(min-width:768px){.promo-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}}

.promo-card{background:#fff;border-radius:var(--radius-lg);padding:24px;border:1px solid var(--gray-200);transition:all var(--transition);position:relative;display:flex;flex-direction:column}
.promo-card:hover{border-color:var(--primary-light);box-shadow:var(--shadow-lg);transform:translateY(-3px)}
.promo-card--featured{border-color:var(--gold);background:linear-gradient(135deg,#FFFBF2,#FFF)}

.promo-card__badge{position:absolute;top:-1px;right:20px;background:var(--gold-gradient);color:#fff;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:1px;padding:5px 14px;border-radius:0 0 var(--radius) var(--radius)}
.promo-card__badge--green{background:var(--green)}

.promo-card__header{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.promo-card__icon{flex-shrink:0;display:flex;align-items:center;justify-content:center;width:48px;height:48px;border-radius:12px;background:var(--primary-surface);overflow:hidden}
.promo-card__icon img{width:100%;height:100%;object-fit:contain}
.promo-card__category{font-size:12px;font-weight:700;color:var(--primary);text-transform:uppercase;letter-spacing:.5px}

.promo-card__image{border-radius:var(--radius-md);overflow:hidden;margin-bottom:16px;aspect-ratio:4/3}
.promo-card__image img{width:100%;height:100%;object-fit:cover;display:block}

.promo-card__title{font-size:20px;font-weight:800;line-height:1.2;color:var(--gray-900);margin-bottom:8px}
.promo-card__subtitle{font-size:13px;color:var(--text-light);margin-bottom:16px}

.promo-card__pricing{display:flex;align-items:center;gap:12px;margin-bottom:16px;flex-wrap:wrap}
.promo-card__discount{padding:4px 12px;background:rgba(239,68,68,.08);color:var(--red);font-weight:700;font-size:13px;border-radius:var(--radius)}
.promo-card__price{font-size:16px;color:var(--gray-900)}
.promo-card__price strong{font-size:22px;background:var(--gold-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}

.promo-card__benefits{display:flex;flex-direction:column;gap:10px;margin-bottom:20px}
.promo-card__benefits li{display:flex;align-items:flex-start;gap:8px;font-size:13px;line-height:1.5;color:var(--gray-700)}
.promo-card__cta{align-self:flex-start;margin-top:auto}

/* ============================================
   DOCTORS
   ============================================ */
.doctors{padding:48px 0;background:#fff}
.doctors-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
@media(min-width:1024px){.doctors-grid{grid-template-columns:repeat(4,1fr);gap:20px}}

.doctor-card{background:#fff;border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--gray-200);transition:all var(--transition);display:flex;flex-direction:column}
.doctor-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-3px)}

.doctor-card__image{position:relative;background:linear-gradient(135deg,var(--primary-surface),#d6e7ff);display:flex;align-items:flex-end;justify-content:center;aspect-ratio:3/4;overflow:hidden}
.doctor-card__image img{width:100%;height:100%;object-fit:contain;object-position:bottom}
.doctor-card__badge-red{position:absolute;top:10px;left:10px;padding:5px 12px;background:linear-gradient(135deg,#DC2626,#B91C1C);color:#fff;font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;border-radius:var(--radius)}

.doctor-card__info{padding:20px;display:flex;flex-direction:column;flex:1}
.doctor-card__name{font-size:18px;font-weight:800;color:var(--gray-900);margin-bottom:2px}
.doctor-card__role{font-size:13px;font-weight:600;color:var(--primary);margin-bottom:12px}
.doctor-card__creds{margin-bottom:16px}
.doctor-card__creds li{font-size:12px;line-height:1.5;color:var(--gray-600);padding-left:16px;position:relative;margin-bottom:4px}
.doctor-card__creds li::before{content:'•';position:absolute;left:0;color:var(--gold);font-weight:900}
.doctor-card__cta{font-size:12px;padding:8px 20px;margin-top:auto}

/* ============================================
   USP / TRUST
   ============================================ */
.trust{padding:48px 0;background:linear-gradient(135deg,var(--primary-dark),var(--primary))}
.trust-grid{display:grid;grid-template-columns:1fr;gap:12px}
@media(min-width:640px){.trust-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.trust-grid{grid-template-columns:repeat(4,1fr)}}

.trust-item{display:flex;gap:14px;align-items:flex-start;padding:20px;border-radius:var(--radius-md);background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.08);color:#fff;transition:all var(--transition)}
.trust-item:hover{background:rgba(255,255,255,.12);border-color:rgba(237,204,130,.3);transform:translateY(-2px)}
.trust-item__icon{font-size:28px;flex-shrink:0}
.trust-item__text{display:flex;flex-direction:column;gap:4px}
.trust-item__text strong{font-size:14px}
.trust-item__text span{font-size:12px;opacity:.7;line-height:1.5}

/* ============================================
   CELEBRITIES
   ============================================ */
.celebs{padding:48px 0;background:var(--gray-50)}
.celebs-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
@media(min-width:640px){.celebs-grid{grid-template-columns:repeat(3,1fr);gap:20px}}
@media(min-width:1024px){.celebs-grid{grid-template-columns:repeat(6,1fr);gap:16px}}

.celeb-card{background:#fff;border:1px solid var(--gray-200);border-radius:var(--radius-lg);padding:12px;text-align:center;transition:all var(--transition)}
.celeb-card:hover{border-color:var(--primary-light);box-shadow:var(--shadow-lg);transform:translateY(-4px)}
.celeb-card__avatar{width:100%;aspect-ratio:1/1;border-radius:var(--radius-md);overflow:hidden;margin:0 auto 10px;border:2px solid var(--gray-200);transition:border-color var(--transition)}
.celeb-card:hover .celeb-card__avatar{border-color:var(--gold)}
.celeb-card__avatar img{width:100%;height:100%;object-fit:cover;object-position:top;transition:transform var(--transition)}
.celeb-card:hover .celeb-card__avatar img{transform:scale(1.05)}
.celeb-card__name{font-size:13px;font-weight:700;color:var(--gray-800);margin-bottom:3px}

/* ============================================
   BOOKING
   ============================================ */
.booking{padding:48px 0;background:linear-gradient(135deg,var(--primary-dark),var(--primary) 50%,var(--primary-deep))}
.booking__layout{position:relative;z-index:1;display:flex;flex-direction:column;gap:32px}
@media(min-width:1024px){.booking__layout{flex-direction:row;gap:48px;align-items:start}
    .booking__info{flex:1}.booking__form-wrapper{width:400px;flex-shrink:0}}

.booking__info{color:#fff}
.booking__text{font-size:14px;opacity:.8;margin-bottom:24px}
.booking__features{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:24px}
.booking__feature{display:flex;gap:10px;padding:12px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.08);border-radius:var(--radius-md)}
.booking__feature-icon{font-size:20px;flex-shrink:0}
.booking__feature strong{display:block;font-size:13px;margin-bottom:1px}
.booking__feature span{font-size:11px;opacity:.65}

.booking__trust-badges{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:8px}
.booking__trust-badge{display:flex;flex-direction:column;align-items:center;text-align:center;padding:16px 12px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.15);border-radius:var(--radius-md);font-size:12px;color:rgba(255,255,255,.8);transition:all var(--transition)}
.booking__trust-badge:hover{background:rgba(255,255,255,.12);border-color:rgba(237,204,130,.3)}
.booking__trust-number{font-size:24px;font-weight:800;margin-bottom:2px;background:var(--gold-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}

/* Form */
.booking-form{background:#fff;border-radius:var(--radius-xl);padding:28px;box-shadow:var(--shadow-xl)}
.booking-form__title{font-size:18px;font-weight:800;color:var(--gray-900);margin-bottom:4px}
.booking-form__subtitle{font-size:13px;color:var(--text-light);margin-bottom:20px}
.form-group{margin-bottom:14px}
.form-label{display:block;font-size:13px;font-weight:600;color:var(--gray-700);margin-bottom:4px}
.form-input{width:100%;padding:12px 14px;font-family:inherit;font-size:14px;color:var(--gray-900);background:var(--gray-50);border:1.5px solid var(--gray-200);border-radius:var(--radius);transition:all var(--transition);outline:none}
.form-input::placeholder{color:var(--gray-400)}
.form-input:focus{border-color:var(--primary);background:#fff;box-shadow:0 0 0 3px rgba(15,79,175,.1)}
.form-select{cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%239CA3AF' stroke-width='2'%3e%3cpath d='M6 9l6 6 6-6'/%3e%3c/svg%3e");background-repeat:no-repeat;background-position:right 12px center;background-size:16px;padding-right:36px}
.form-textarea{resize:vertical;min-height:60px}
.booking-form__privacy{font-size:12px;color:var(--text-light);margin-top:12px;text-align:center}

/* ============================================
   FAQ
   ============================================ */
.faq{padding:48px 0;background:#fff}
.faq__list{display:flex;flex-direction:column;gap:6px;max-width:720px;margin:0 auto}

.faq-item{border:1px solid var(--gray-200);border-radius:var(--radius-md);overflow:hidden;transition:all var(--transition)}
.faq-item.active{border-color:var(--primary-light);box-shadow:var(--shadow)}
.faq-item__question{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;padding:14px 16px;background:none;border:none;cursor:pointer;font-family:inherit;font-size:14px;font-weight:600;color:var(--gray-800);text-align:left;transition:all var(--transition)}
.faq-item__question:hover{color:var(--primary)}
.faq-item__chevron{flex-shrink:0;transition:transform var(--transition);color:var(--gray-400)}
.faq-item.active .faq-item__chevron{transform:rotate(180deg);color:var(--primary)}
.faq-item__answer{max-height:0;overflow:hidden;transition:max-height .4s var(--ease)}
.faq-item.active .faq-item__answer{max-height:400px}
.faq-item__answer>*{padding:0 16px}
.faq-item__answer>*:last-child{padding-bottom:16px}
.faq-item__answer p{font-size:13px;line-height:1.7;color:var(--gray-600);margin-bottom:6px}
.faq-item__answer ul{padding-left:32px;margin-bottom:6px}
.faq-item__answer ul li{font-size:13px;line-height:1.6;color:var(--gray-600);margin-bottom:3px;list-style:disc}
.faq-item__answer a{color:var(--primary);font-weight:600}

/* ============================================
   FOOTER
   ============================================ */
.footer{background:var(--primary-dark);padding:40px 0 0;color:#fff}
.footer__inner{display:grid;grid-template-columns:1fr;gap:24px;padding-bottom:24px}
@media(min-width:768px){.footer__inner{grid-template-columns:1.5fr 1fr 1fr}}
.footer__logo{width:140px;margin-bottom:8px}
.footer__slogan{font-size:14px;font-weight:600;background:var(--gold-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.footer__heading{font-size:13px;font-weight:700;margin-bottom:10px;text-transform:uppercase;letter-spacing:1px}
.footer__address{font-size:13px;opacity:.8;margin-bottom:8px}
.footer__contact-link{display:block;font-size:13px;opacity:.8;margin-bottom:6px}
.footer__contact-link:hover{opacity:1}
.footer__bottom{border-top:1px solid rgba(255,255,255,.1);padding:16px 0;display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;font-size:12px;opacity:.6}
.footer__links{display:flex;gap:16px}
.footer__links a:hover{opacity:.8}

/* ============================================
   FLOATING CTAs (desktop only)
   ============================================ */
.floating-cta{position:fixed;right:16px;bottom:90px;z-index:900;display:none;flex-direction:column;gap:10px}
@media(min-width:768px){.floating-cta{display:flex}}
.floating-cta__btn{width:48px;height:48px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;box-shadow:var(--shadow-lg);transition:all var(--transition)}
.floating-cta__btn:hover{transform:scale(1.1)}
.floating-cta__btn--booking{background:var(--primary)}
.floating-cta__btn--messenger{background:linear-gradient(135deg,#006AFF,#0099FF)}
.floating-cta__btn--zalo{background:#0068FF}

/* ============================================
   MOBILE BOTTOM BAR
   ============================================ */
.mobile-bar{position:fixed;bottom:0;left:0;right:0;z-index:1000;background:#fff;border-top:1px solid var(--gray-200);display:flex;box-shadow:0 -4px 16px rgba(0,0,0,.08);padding:6px;gap:6px}
@media(min-width:768px){.mobile-bar{display:none}}
.mobile-bar__btn{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;padding:8px;border-radius:var(--radius);font-size:11px;font-weight:600;color:var(--gray-600)}
.mobile-bar__btn--primary{background:var(--gold-gradient);color:#fff;border-radius:var(--radius-md)}

/* ============================================
   ANIMATIONS
   ============================================ */
.reveal{opacity:0;transform:translateY(20px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.reveal.visible{opacity:1;transform:translateY(0)}
.reveal-delay-1{transition-delay:.1s}
.reveal-delay-2{transition-delay:.15s}
.reveal-delay-3{transition-delay:.2s}
.reveal-delay-4{transition-delay:.25s}

/* Gold CTA pulse */
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(199,141,61,.5)}70%{box-shadow:0 0 0 12px rgba(199,141,61,0)}100%{box-shadow:0 0 0 0 rgba(199,141,61,0)}}
.btn--gold{animation:pulse 2.5s infinite}
.btn--gold:hover{animation:none}