/* =============================================
   Dra. Bibi — Odontopediatra Porto Alegre
   Modern CSS: Mobile-first, Custom Properties
   ============================================= */

:root {
    --color-primary: #2A7FA5;
    --color-primary-dark: #1E5F7D;
    --color-primary-light: #E8F4F8;
    --color-accent: #FF9E7D;
    --color-accent-dark: #E8865F;
    --color-whatsapp: #25D366;
    --color-whatsapp-dark: #1DA851;
    --color-bg: #FDF9F4;
    --color-surface: #FFFFFF;
    --color-text: #1F3244;
    --color-text-light: #5A6B7D;
    --color-text-muted: #8E9BAA;
    --color-border: #E8E0D8;
    --color-star: #F5B731;
    --font-display: 'Nunito', sans-serif;
    --font-body: 'Inter', sans-serif;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --shadow-sm: 0 1px 3px rgba(31,50,68,0.06);
    --shadow-md: 0 4px 12px rgba(31,50,68,0.08);
    --shadow-lg: 0 8px 30px rgba(31,50,68,0.12);
    --shadow-xl: 0 20px 60px rgba(31,50,68,0.15);
    --transition: 0.25s ease;
    --container-max: 1140px;
    --header-h: 72px;
}

/* ============ RESET ============ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }
body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-dark); }
ul { list-style: none; }
address { font-style: normal; }

/* ============ UTILITIES ============ */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 20px;
}
.center { text-align: center; }
.section-label {
    display: block;
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-accent);
    margin-bottom: 8px;
}
.section-title {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    color: var(--color-text);
    margin-bottom: 16px;
    text-align: center;
}
.section-desc {
    text-align: center;
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto 40px;
    font-size: 1.05rem;
}
.text-accent { color: var(--color-accent); }
.section {
    padding: 64px 0;
}

/* ============ BUTTONS ============ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--radius-xl);
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
    justify-content: center;
}
.btn-whatsapp {
    background: var(--color-whatsapp);
    color: #fff;
    border-color: var(--color-whatsapp);
}
.btn-whatsapp:hover {
    background: var(--color-whatsapp-dark);
    border-color: var(--color-whatsapp-dark);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37,211,102,0.35);
}
.btn-outline-light {
    background: transparent;
    color: var(--color-primary-dark);
    border-color: var(--color-primary);
}
.btn-outline-light:hover {
    background: var(--color-primary);
    color: #fff;
    transform: translateY(-2px);
}
.btn-directions {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    border-radius: var(--radius-md);
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 600;
    background: var(--color-surface);
    color: var(--color-primary);
    border: 2px solid var(--color-border);
    transition: all var(--transition);
}
.btn-directions:hover {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    transform: translateY(-1px);
}

/* ============ HEADER ============ */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-h);
    background: rgba(253,249,244,0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
    transition: box-shadow var(--transition);
    border-bottom: 1px solid transparent;
}
.site-header.scrolled {
    box-shadow: var(--shadow-sm);
    border-bottom-color: var(--color-border);
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    gap: 16px;
}
.logo img {
    height: 44px;
    width: auto;
}
.main-nav { display: none; }
.nav-list {
    display: flex;
    gap: 4px;
}
.nav-link {
    padding: 8px 14px;
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-light);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}
.nav-link:hover {
    color: var(--color-primary);
    background: var(--color-primary-light);
}
.btn-whatsapp-header {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 18px;
    background: var(--color-whatsapp);
    color: #fff;
    border-radius: var(--radius-xl);
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 700;
    transition: all var(--transition);
    white-space: nowrap;
}
.btn-whatsapp-header:hover {
    background: var(--color-whatsapp-dark);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37,211,102,0.3);
}
.btn-whatsapp-header span { display: none; }

/* Hamburger */
.menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}
.hamburger,
.hamburger::before,
.hamburger::after {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all 0.3s ease;
    position: relative;
}
.hamburger::before, .hamburger::after {
    content: '';
    position: absolute;
    left: 0;
    width: 22px;
}
.hamburger::before { top: -7px; }
.hamburger::after { top: 7px; }
.menu-toggle[aria-expanded="true"] .hamburger { background: transparent; }
.menu-toggle[aria-expanded="true"] .hamburger::before { top: 0; transform: rotate(45deg); }
.menu-toggle[aria-expanded="true"] .hamburger::after { top: 0; transform: rotate(-45deg); }

/* Mobile nav open */
.main-nav.open {
    display: block;
    position: fixed;
    top: 72px;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: 0;
    height: calc(100vh - 72px);
    height: calc(100dvh - var(--header-h, 72px));
    background: var(--color-bg);
    padding: 24px 20px;
    z-index: 999;
    overflow-y: auto;
    animation: slideDown 0.3s ease;
}
.main-nav.open .nav-list {
    flex-direction: column;
    gap: 0;
}
.main-nav.open .nav-link {
    display: block;
    padding: 16px 20px;
    font-size: 1.1rem;
    border-bottom: 1px solid var(--color-border);
}
@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ============ HERO ============ */
.hero {
    padding: calc(var(--header-h) + 40px) 0 48px;
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-bg) 50%, #FFF5EE 100%);
    overflow: hidden;
}
.hero-inner {
    display: flex;
    flex-direction: column-reverse;
    align-items: center;
    gap: 32px;
}
.hero-content {
    text-align: center;
}
.hero h1 {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 5vw, 3.2rem);
    font-weight: 800;
    line-height: 1.2;
    color: var(--color-text);
    margin-bottom: 16px;
}
.hero-accent {
    color: var(--color-primary);
}
.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: var(--color-text-light);
    max-width: 520px;
    margin: 0 auto 28px;
    line-height: 1.6;
}
.hero-ctas {
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: center;
}
.hero-image {
    width: 260px;
    flex-shrink: 0;
}
.hero-image img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    object-fit: cover;
    width: 100%;
    aspect-ratio: 3/4;
}

/* ============ TRUST BAR ============ */
.trust-bar {
    background: var(--color-primary);
    padding: 24px 0;
}
.trust-inner {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}
.trust-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #fff;
    font-size: 0.85rem;
    line-height: 1.4;
}
.trust-icon {
    width: 28px;
    height: 28px;
    flex-shrink: 0;
    opacity: 0.85;
}

/* ============ ABOUT ============ */
.section-about {
    background: var(--color-surface);
}
.about-inner {
    display: flex;
    flex-direction: column;
    gap: 32px;
    align-items: center;
}
.about-image {
    width: 280px;
    flex-shrink: 0;
}
.about-image img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    object-fit: cover;
    width: 100%;
    aspect-ratio: 3/4;
}
.about-content h2 {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 4vw, 2.25rem);
    font-weight: 800;
    margin-bottom: 20px;
    text-align: left;
}
.about-content p {
    color: var(--color-text-light);
    margin-bottom: 16px;
    font-size: 1.02rem;
}
.about-content .btn {
    margin-top: 12px;
}

/* ============ STEPS ============ */
.section-steps {
    background: var(--color-bg);
}
.steps-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    margin-top: 40px;
}
.step-card {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    padding: 32px 24px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    position: relative;
    transition: transform var(--transition), box-shadow var(--transition);
}
.step-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}
.step-number {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    width: 32px;
    height: 32px;
    background: var(--color-accent);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 0.9rem;
}
.step-icon {
    width: 40px;
    height: 40px;
    color: var(--color-primary);
    margin: 8px auto 16px;
}
.step-card h3 {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--color-text);
}
.step-card p {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

/* ============ SERVICES ============ */
.section-services {
    background: var(--color-surface);
}
.services-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    margin-top: 40px;
}
.service-card {
    padding: 28px 24px;
    background: var(--color-bg);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    transition: transform var(--transition), box-shadow var(--transition);
}
.service-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}
.service-icon-wrap {
    width: 48px;
    height: 48px;
    background: var(--color-primary-light);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}
.service-icon-wrap svg {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
}
.service-card h3 {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--color-text);
}
.service-card p {
    color: var(--color-text-light);
    font-size: 0.93rem;
    line-height: 1.6;
}

/* ============ GALLERY ============ */
.section-gallery {
    background: var(--color-bg);
}
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-top: 32px;
}
.gallery-item {
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    position: relative;
}
.gallery-item::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 60%, rgba(31,50,68,0.2) 100%);
    opacity: 0;
    transition: opacity var(--transition);
}
.gallery-item:hover::after,
.gallery-item:focus-visible::after {
    opacity: 1;
}
.gallery-item img {
    width: 100%;
    aspect-ratio: 4/5;
    object-fit: cover;
    transition: transform 0.4s ease;
}
.gallery-item:hover img,
.gallery-item:focus-visible img {
    transform: scale(1.04);
}

/* ============ TESTIMONIALS ============ */
.section-testimonials {
    background: var(--color-surface);
}
.testimonials-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    margin-top: 40px;
}
.testimonial-card {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: 28px 24px;
    border: 1px solid var(--color-border);
    border-left: 4px solid var(--color-accent);
}
.stars {
    display: flex;
    gap: 2px;
    margin-bottom: 12px;
}
.stars svg {
    width: 18px;
    height: 18px;
    color: var(--color-star);
}
.testimonial-card p {
    font-size: 1rem;
    color: var(--color-text);
    font-style: italic;
    line-height: 1.7;
    margin-bottom: 12px;
}
.testimonial-card cite {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    font-style: normal;
    font-weight: 600;
}
.testimonials-note {
    text-align: center;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-top: 24px;
    font-style: italic;
}

/* ============ FAQ ============ */
.section-faq {
    background: var(--color-bg);
}
.faq-list {
    max-width: 720px;
    margin: 40px auto 0;
}
.faq-item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    overflow: hidden;
    transition: box-shadow var(--transition);
}
.faq-item[open] {
    box-shadow: var(--shadow-sm);
}
.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 20px 24px;
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text);
    cursor: pointer;
    user-select: none;
    list-style: none;
}
.faq-question::-webkit-details-marker { display: none; }
.faq-question::marker { content: ''; }
.faq-chevron {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    color: var(--color-text-muted);
    transition: transform 0.3s ease;
}
.faq-item[open] .faq-chevron {
    transform: rotate(180deg);
}
.faq-answer {
    padding: 0 24px 20px;
}
.faq-answer p {
    color: var(--color-text-light);
    font-size: 0.95rem;
    line-height: 1.7;
}
.faq-answer a {
    color: var(--color-primary);
    text-decoration: underline;
}

/* ============ LOCATION ============ */
.section-location {
    background: var(--color-surface);
}
.location-inner {
    display: flex;
    flex-direction: column;
    gap: 32px;
    margin-top: 40px;
}
.location-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.location-address,
.location-hours {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    font-size: 0.95rem;
    color: var(--color-text);
    line-height: 1.6;
}
.location-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    color: var(--color-primary);
    margin-top: 2px;
}
.location-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.location-map {
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
}
.location-map iframe {
    display: block;
    min-height: 300px;
}

/* ============ CONTACT ============ */
.section-contact {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: #fff;
}
.section-contact .section-label { color: rgba(255,255,255,0.7); }
.section-contact .section-title { color: #fff; }
.section-contact .section-desc { color: rgba(255,255,255,0.85); }
.contact-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    max-width: 800px;
    margin: 32px auto 0;
}
.contact-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 28px 20px;
    background: rgba(255,255,255,0.12);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: var(--radius-md);
    color: #fff;
    text-align: center;
    transition: all var(--transition);
}
.contact-card:hover {
    background: rgba(255,255,255,0.2);
    color: #fff;
    transform: translateY(-2px);
}
.contact-card strong {
    font-family: var(--font-display);
    font-size: 1.05rem;
}
.contact-card span {
    font-size: 0.9rem;
    opacity: 0.85;
}
.contact-whatsapp {
    background: rgba(37,211,102,0.25);
    border-color: rgba(37,211,102,0.4);
}
.contact-whatsapp:hover {
    background: rgba(37,211,102,0.4);
}

/* ============ FOOTER ============ */
.site-footer {
    background: var(--color-text);
    color: rgba(255,255,255,0.7);
    font-size: 0.9rem;
}
.footer-inner {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 48px 20px;
}
.footer-brand img {
    margin-bottom: 12px;
    filter: brightness(0) invert(1);
    opacity: 0.8;
}
.footer-brand p { line-height: 1.6; }
.footer-contact p { line-height: 1.6; margin-bottom: 4px; }
.footer-contact strong, .footer-social strong {
    color: #fff;
    font-family: var(--font-display);
}
.footer-contact a { color: rgba(255,255,255,0.8); }
.footer-contact a:hover { color: #fff; }
.social-links {
    display: flex;
    gap: 12px;
    margin-top: 12px;
}
.social-links a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    color: rgba(255,255,255,0.7);
    transition: all var(--transition);
}
.social-links a:hover {
    background: var(--color-primary);
    color: #fff;
}
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding: 20px 0;
    text-align: center;
    font-size: 0.8rem;
    color: rgba(255,255,255,0.4);
}

/* ============ FLOATING WHATSAPP ============ */
.fab-whatsapp {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 900;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 18px;
    background: var(--color-whatsapp);
    color: #fff;
    border-radius: var(--radius-xl);
    box-shadow: 0 4px 16px rgba(37,211,102,0.4);
    transition: all var(--transition);
    animation: fabPulse 3s ease infinite;
}
.fab-whatsapp:hover {
    background: var(--color-whatsapp-dark);
    color: #fff;
    transform: scale(1.05);
    box-shadow: 0 6px 24px rgba(37,211,102,0.5);
    animation: none;
}
.fab-label {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.9rem;
    display: none;
}
@keyframes fabPulse {
    0%, 100% { box-shadow: 0 4px 16px rgba(37,211,102,0.4); }
    50% { box-shadow: 0 4px 24px rgba(37,211,102,0.6); }
}

/* ============ LIGHTBOX ============ */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(0,0,0,0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    cursor: zoom-out;
}
.lightbox[hidden] { display: none; }
.lightbox-close {
    position: absolute;
    top: 16px;
    right: 20px;
    background: none;
    border: none;
    color: #fff;
    font-size: 2.5rem;
    cursor: pointer;
    line-height: 1;
    z-index: 2001;
    transition: opacity var(--transition);
}
.lightbox-close:hover { opacity: 0.7; }
.lightbox-img {
    max-width: 90vw;
    max-height: 85vh;
    object-fit: contain;
    border-radius: var(--radius-sm);
    cursor: default;
}

/* ============ RESPONSIVE: TABLET (768px+) ============ */
@media (min-width: 768px) {
    .container { padding: 0 32px; }
    .section { padding: 80px 0; }

    /* Hero */
    .hero { padding: calc(var(--header-h) + 64px) 0 64px; }
    .hero-inner { flex-direction: row; gap: 48px; }
    .hero-content { text-align: left; flex: 1; }
    .hero-subtitle { margin: 0 0 28px; }
    .hero-ctas { flex-direction: row; justify-content: flex-start; }
    .hero-image { width: 320px; }

    /* Trust */
    .trust-inner { grid-template-columns: repeat(4, 1fr); gap: 24px; }

    /* About */
    .about-inner { flex-direction: row; gap: 48px; align-items: center; }
    .about-image { width: 340px; }

    /* Steps */
    .steps-grid { grid-template-columns: repeat(3, 1fr); }

    /* Services */
    .services-grid { grid-template-columns: repeat(2, 1fr); }

    /* Gallery */
    .gallery-grid { grid-template-columns: repeat(3, 1fr); gap: 16px; }

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

    /* Location */
    .location-inner { flex-direction: row; align-items: flex-start; }
    .location-info { flex: 0 0 360px; }
    .location-map { flex: 1; }
    .location-buttons { flex-direction: row; }

    /* Contact */
    .contact-grid { grid-template-columns: repeat(3, 1fr); }

    /* Footer */
    .footer-inner { grid-template-columns: repeat(3, 1fr); }

    /* FAB */
    .fab-label { display: inline; }
}

/* ============ RESPONSIVE: DESKTOP (1024px+) ============ */
@media (min-width: 1024px) {
    /* Nav */
    .main-nav,
    .main-nav.open {
        display: block;
        position: static;
        height: auto;
        background: transparent;
        padding: 0;
        overflow: visible;
        animation: none;
    }
    .main-nav.open .nav-list {
        flex-direction: row;
    }
    .main-nav.open .nav-link {
        font-size: 0.9rem;
        border-bottom: none;
        padding: 8px 14px;
    }
    .menu-toggle { display: none; }
    .btn-whatsapp-header span { display: inline; }

    /* Hero */
    .hero { padding: calc(var(--header-h) + 80px) 0 80px; }
    .hero-image { width: 400px; }

    /* Services */
    .services-grid { grid-template-columns: repeat(3, 1fr); }

    /* About */
    .about-image { width: 380px; }
}