/* ==========================================================================
   OXÍGENO AUDITIVO - BIOTECH COCHLEAR OXYGENATION SUITE
   Palette: Biotech Teal (#134e4a, #0f766e), Warm Coral (#ea580c, #f97316)
   Clean Bio-Journal Architecture & High Readability
   Prefix: oa-*
   ========================================================================== */

:root {
    --oa-bg: #f0fdfa;
    --oa-surface: #ffffff;
    --oa-surface-soft: #f8fafc;
    --oa-teal-dark: #134e4a;
    --oa-teal-mid: #0f766e;
    --oa-teal-light: #ccfbf1;
    --oa-teal-border: #99f6e4;
    --oa-coral: #ea580c;
    --oa-coral-light: #ffedd5;
    --oa-coral-hover: #c2410c;
    --oa-text-main: #134e4a;
    --oa-text-body: #1e293b;
    --oa-text-muted: #64748b;
    --oa-border: #e2e8f0;
    --oa-border-subtle: #cbd5e1;
    --oa-shadow: 0 4px 6px -1px rgba(19, 78, 74, 0.06), 0 2px 4px -2px rgba(19, 78, 74, 0.04);
    --oa-shadow-lg: 0 10px 15px -3px rgba(19, 78, 74, 0.1), 0 4px 6px -4px rgba(19, 78, 74, 0.05);
    --oa-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--oa-bg);
    color: var(--oa-text-body);
    font-family: var(--oa-font);
    font-size: 16px;
    line-height: 1.68;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--oa-teal-mid);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--oa-coral);
    text-decoration: underline;
}

.oa-container {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header & Top Bar */
.oa-topbar {
    background-color: var(--oa-teal-dark);
    color: #ccfbf1;
    font-size: 13px;
    padding: 8px 0;
}

.oa-topbar-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}

.oa-topbar-pill {
    background: rgba(255, 255, 255, 0.12);
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 11.5px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.oa-header {
    background-color: var(--oa-surface);
    border-bottom: 2px solid var(--oa-teal-light);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 3px rgba(19, 78, 74, 0.05);
}

.oa-nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.oa-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.oa-brand-circle {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--oa-teal-dark), var(--oa-teal-mid));
    border: 2px solid var(--oa-coral);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    font-weight: 800;
    font-size: 18px;
    letter-spacing: -0.5px;
}

.oa-brand-text {
    display: flex;
    flex-direction: column;
}

.oa-brand-title {
    font-size: 21px;
    font-weight: 800;
    color: var(--oa-teal-dark);
    line-height: 1.2;
    letter-spacing: -0.5px;
}

.oa-brand-subtitle {
    font-size: 11.5px;
    font-weight: 600;
    color: var(--oa-coral);
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

.oa-nav-menu {
    display: flex;
    align-items: center;
    gap: 18px;
    list-style: none;
}

.oa-nav-menu a {
    color: var(--oa-teal-dark);
    font-weight: 600;
    font-size: 14.5px;
    padding: 6px 10px;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.oa-nav-menu a:hover,
.oa-nav-menu a.active {
    color: var(--oa-teal-dark);
    background-color: var(--oa-teal-light);
    text-decoration: none;
}

.oa-btn-cta {
    background: linear-gradient(135deg, var(--oa-coral), var(--oa-coral-hover));
    color: #ffffff !important;
    padding: 10px 18px !important;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 700;
    box-shadow: 0 2px 4px rgba(234, 88, 12, 0.25);
    transition: all 0.2s ease;
}

.oa-btn-cta:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(234, 88, 12, 0.35);
    text-decoration: none !important;
}

/* Hero Section */
.oa-hero {
    background: linear-gradient(180deg, #ffffff 0%, var(--oa-bg) 100%);
    padding: 55px 0 40px 0;
    border-bottom: 1px solid var(--oa-teal-border);
}

.oa-hero-split {
    display: grid;
    grid-template-columns: 1.3fr 0.9fr;
    gap: 36px;
    align-items: center;
}

.oa-tag-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background-color: var(--oa-teal-light);
    color: var(--oa-teal-dark);
    border: 1px solid var(--oa-teal-border);
    padding: 6px 14px;
    border-radius: 999px;
    font-size: 12.5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    margin-bottom: 16px;
}

.oa-hero h1 {
    font-size: 38px;
    font-weight: 800;
    color: var(--oa-teal-dark);
    line-height: 1.25;
    letter-spacing: -0.8px;
    margin-bottom: 18px;
}

.oa-hero-desc {
    font-size: 17px;
    color: var(--oa-text-muted);
    margin-bottom: 24px;
    line-height: 1.65;
}

.oa-stat-row {
    display: flex;
    gap: 24px;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--oa-teal-border);
}

.oa-stat-unit h4 {
    font-size: 26px;
    font-weight: 800;
    color: var(--oa-teal-mid);
}

.oa-stat-unit p {
    font-size: 12.5px;
    color: var(--oa-text-muted);
    font-weight: 600;
}

/* Interactive Quiz Widget (Hero Right) */
.oa-quiz-box {
    background: var(--oa-surface);
    border: 2px solid var(--oa-teal-border);
    border-radius: 14px;
    padding: 24px;
    box-shadow: var(--oa-shadow-lg);
    position: relative;
    overflow: hidden;
}

.oa-quiz-box::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--oa-teal-mid), var(--oa-coral));
}

.oa-quiz-title {
    font-size: 16.5px;
    font-weight: 800;
    color: var(--oa-teal-dark);
    margin-bottom: 6px;
}

.oa-quiz-sub {
    font-size: 13px;
    color: var(--oa-text-muted);
    margin-bottom: 16px;
}

.oa-quiz-item {
    margin-bottom: 14px;
}

.oa-quiz-q {
    font-size: 13.5px;
    font-weight: 600;
    color: var(--oa-teal-dark);
    margin-bottom: 6px;
}

.oa-quiz-options {
    display: flex;
    gap: 10px;
}

.oa-quiz-btn {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid var(--oa-border);
    background: var(--oa-surface-soft);
    border-radius: 6px;
    font-size: 12.5px;
    font-weight: 600;
    color: var(--oa-text-body);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
}

.oa-quiz-btn.active {
    background: var(--oa-teal-mid);
    color: #ffffff;
    border-color: var(--oa-teal-mid);
}

.oa-quiz-output {
    background: var(--oa-teal-light);
    border: 1px solid var(--oa-teal-border);
    border-radius: 8px;
    padding: 14px;
    margin-top: 16px;
    text-align: center;
}

.oa-output-score {
    font-size: 22px;
    font-weight: 800;
    color: var(--oa-teal-dark);
}

.oa-output-note {
    font-size: 12.5px;
    font-weight: 600;
    color: var(--oa-teal-mid);
    margin-top: 4px;
}

/* Journal Grid Section */
.oa-journal-section {
    padding: 55px 0 70px 0;
}

.oa-section-heading {
    text-align: left;
    margin-bottom: 36px;
}

.oa-section-heading h2 {
    font-size: 28px;
    font-weight: 800;
    color: var(--oa-teal-dark);
    letter-spacing: -0.5px;
}

.oa-section-heading p {
    font-size: 15.5px;
    color: var(--oa-text-muted);
}

.oa-cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.oa-card {
    background: var(--oa-surface);
    border: 1px solid var(--oa-border);
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--oa-shadow);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.oa-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--oa-shadow-lg);
    border-color: var(--oa-teal-mid);
}

.oa-card-label {
    font-size: 11.5px;
    font-weight: 700;
    color: var(--oa-coral);
    text-transform: uppercase;
    letter-spacing: 0.6px;
    margin-bottom: 10px;
}

.oa-card h3 {
    font-size: 18.5px;
    font-weight: 750;
    color: var(--oa-teal-dark);
    line-height: 1.35;
    margin-bottom: 10px;
}

.oa-card p {
    font-size: 14.5px;
    color: var(--oa-text-muted);
    line-height: 1.6;
    margin-bottom: 18px;
}

.oa-card-action {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 14px;
    border-top: 1px solid var(--oa-border);
    font-size: 13px;
}

.oa-read-link {
    font-weight: 700;
    color: var(--oa-teal-mid);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

/* Article Layout */
.oa-article-wrap {
    padding: 50px 0 70px 0;
}

.oa-article-flex {
    display: grid;
    grid-template-columns: 2.2fr 1fr;
    gap: 40px;
}

.oa-entry-body {
    background: var(--oa-surface);
    border: 1px solid var(--oa-border);
    border-radius: 14px;
    padding: 40px;
    box-shadow: var(--oa-shadow);
}

.oa-entry-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    font-size: 13px;
    color: var(--oa-text-muted);
    margin-bottom: 20px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--oa-border);
}

.oa-entry-meta span.oa-chip {
    background: var(--oa-coral-light);
    color: var(--oa-coral);
    padding: 3px 10px;
    border-radius: 999px;
    font-weight: 700;
    font-size: 11.5px;
}

.oa-entry-body h1 {
    font-size: 32px;
    font-weight: 800;
    color: var(--oa-teal-dark);
    line-height: 1.25;
    letter-spacing: -0.6px;
    margin-bottom: 22px;
}

.oa-entry-body h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--oa-teal-dark);
    margin: 32px 0 14px 0;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--oa-teal-light);
}

.oa-entry-body p {
    font-size: 16px;
    color: var(--oa-text-body);
    line-height: 1.75;
    margin-bottom: 18px;
}

.oa-entry-body ul,
.oa-entry-body ol {
    margin: 16px 0 24px 24px;
}

.oa-entry-body li {
    margin-bottom: 10px;
    line-height: 1.7;
    color: var(--oa-text-body);
}

.oa-highlight-card {
    background: var(--oa-surface-soft);
    border-left: 4px solid var(--oa-coral);
    padding: 18px 22px;
    margin: 24px 0;
    border-radius: 0 8px 8px 0;
    font-size: 15px;
    color: var(--oa-teal-dark);
}

/* Sidebar */
.oa-side-panel {
    background: var(--oa-surface);
    border: 1px solid var(--oa-border);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: var(--oa-shadow);
}

.oa-side-panel h4 {
    font-size: 16px;
    font-weight: 750;
    color: var(--oa-teal-dark);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--oa-border);
}

.oa-side-list {
    list-style: none;
}

.oa-side-list li {
    margin-bottom: 12px;
}

.oa-side-list a {
    color: var(--oa-text-body);
    font-size: 14px;
    font-weight: 600;
    display: block;
    line-height: 1.4;
}

.oa-side-list a:hover {
    color: var(--oa-coral);
    text-decoration: none;
    transform: translateX(3px);
}

/* Footer */
.oa-footer {
    background-color: var(--oa-teal-dark);
    color: #ccfbf1;
    padding: 55px 0 24px 0;
    border-top: 4px solid var(--oa-coral);
    font-size: 14px;
}

.oa-footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 36px;
    margin-bottom: 36px;
}

.oa-footer-col h5 {
    color: #ffffff;
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

.oa-footer-col p {
    line-height: 1.6;
    margin-bottom: 12px;
    color: #99f6e4;
}

.oa-footer-links {
    list-style: none;
}

.oa-footer-links li {
    margin-bottom: 10px;
}

.oa-footer-links a {
    color: #ccfbf1;
    font-size: 13.5px;
}

.oa-footer-links a:hover {
    color: #ffffff;
    text-decoration: underline;
}

.oa-footer-bottom {
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 14px;
    font-size: 13px;
    color: #99f6e4;
}

.oa-legal-tag {
    background: rgba(255, 255, 255, 0.08);
    padding: 10px 16px;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    font-size: 12.5px;
    line-height: 1.5;
    color: #ffffff;
}

@media (max-width: 900px) {
    .oa-hero-split,
    .oa-article-flex,
    .oa-cards-grid,
    .oa-footer-grid {
        grid-template-columns: 1fr;
    }
    .oa-nav-menu {
        display: none;
    }
    .oa-hero h1 {
        font-size: 28px;
    }
}