/* ==========================================================
   TĨNH ĐAO — INSIGHTS BLOG STYLESHEET
   Phong cách: Editorial, đọc lâu, tối, premium
   Kế thừa palette từ style.css gốc
   ========================================================== */

/* === RESET PAGE FOR INSIGHTS === */
.insights-nav,
.insights-main,
.insights-hero,
.insights-footer {
    font-family: 'Be Vietnam Pro', sans-serif;
    color: var(--text);
}

body {
    background: var(--bg);
}

/* ==========================================================
   NAV — Always-visible horizontal navigation with dropdowns
   Cấu trúc: [LOGO]  [TRANG CHỦ ▾] [KHÁM PHÁ ▾]
   
   Bullet-proof override:
   - Đè CSS cũ `nav { position: fixed; width: 320px... }` trong style.css
   - Fix iOS Safari quirks (iPhone 16 Pro Max)
   - Dùng !important toàn bộ properties layout-critical
   ========================================================== */
nav.insights-nav,
.insights-nav {
    position: -webkit-sticky !important;
    position: sticky !important;
    top: 0 !important;
    right: auto !important;
    left: auto !important;
    bottom: auto !important;
    width: 100% !important;
    max-width: 100% !important;
    height: auto !important;
    min-height: auto !important;
    -webkit-transform: none !important;
    transform: none !important;
    background: rgba(5, 5, 5, 0.92) !important;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border) !important;
    border-left: none !important;
    border-right: none !important;
    border-top: none !important;
    padding: 0 !important;
    margin: 0 !important;
    box-shadow: none !important;
    flex-direction: row !important;
    display: block !important;
    z-index: 100 !important;
    visibility: visible !important;
    opacity: 1 !important;
    pointer-events: auto !important;
    box-sizing: border-box !important;
}

/* Reset for ALL states (active, hover etc) */
nav.insights-nav.active,
.insights-nav.active {
    -webkit-transform: none !important;
    transform: none !important;
}

/* Override base nav a styles for insights-nav */
nav.insights-nav a,
.insights-nav a {
    padding: 0;
    border-bottom: none;
    text-transform: none;
    letter-spacing: normal;
}

.insights-nav-inner {
    max-width: 1200px !important;
    margin: 0 auto !important;
    padding: 16px 32px !important;
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    gap: 16px !important;
    width: 100% !important;
    box-sizing: border-box !important;
    position: relative !important;
}

.insights-logo {
    text-decoration: none !important;
    transition: opacity 0.3s ease;
    flex-shrink: 0 !important;
    display: inline-flex !important;
    align-items: center !important;
}

.insights-logo:hover {
    opacity: 0.8;
}

.insights-logo-text {
    font-family: 'Montserrat', 'Be Vietnam Pro', sans-serif;
    font-weight: 800;
    font-size: 18px;
    letter-spacing: 4px;
    color: var(--text);
    line-height: 1;
}

.insights-logo-text em {
    font-style: italic;
    color: var(--coral);
    font-weight: 800;
}

/* === Always-visible nav links === */
.insights-nav-links {
    display: flex !important;
    gap: 4px !important;
    align-items: center !important;
    flex-wrap: nowrap !important;
}

.insights-nav .insights-nav-links>a,
.insights-nav-dropdown-btn {
    font-family: 'Be Vietnam Pro', sans-serif;
    font-size: 13px;
    font-weight: 600;
    color: var(--muted);
    text-decoration: none;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    padding: 10px 14px;
    background: transparent;
    border: none;
    cursor: pointer;
    transition: color 0.25s ease, background 0.25s ease;
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border-radius: 6px;
    white-space: nowrap;
    line-height: 1;
    flex-shrink: 0;
}

.insights-nav .insights-nav-links>a:hover,
.insights-nav-dropdown-btn:hover,
.insights-nav-dropdown.open .insights-nav-dropdown-btn {
    color: var(--text);
    background: rgba(255, 255, 255, 0.04);
}

/* Active state - current page indicator */
.insights-nav .insights-nav-links>a.active {
    color: var(--text);
}

.insights-nav .insights-nav-links>a.active::after {
    content: '';
    position: absolute;
    bottom: -16px;
    left: 14px;
    right: 14px;
    height: 2px;
    background: var(--teal, #087E8B);
}

/* Dropdown caret */
.insights-nav-dropdown-btn::after {
    content: '';
    width: 6px;
    height: 6px;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    transform: rotate(45deg);
    margin-top: -3px;
    transition: transform 0.25s ease;
    margin-left: 2px;
    flex-shrink: 0;
}

.insights-nav-dropdown.open .insights-nav-dropdown-btn::after {
    transform: rotate(225deg);
    margin-top: 2px;
}

/* Dropdown panel */
.insights-nav-dropdown {
    position: relative;
}

.insights-nav-dropdown-panel {
    position: absolute;
    top: calc(100% + 12px);
    right: 0;
    min-width: 220px;
    background: linear-gradient(180deg, #0e0e0e 0%, #060606 100%);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 8px;
    opacity: 0;
    transform: translateY(-8px);
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.02);
    z-index: 200;
}

.insights-nav-dropdown.open .insights-nav-dropdown-panel {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.insights-nav-dropdown-panel a {
    display: block;
    padding: 11px 16px;
    font-size: 13px;
    font-weight: 500;
    color: rgba(244, 236, 216, 0.78);
    text-decoration: none;
    letter-spacing: 0.5px;
    text-transform: none;
    border-bottom: none;
    border-radius: 6px;
    transition: color 0.2s ease, background 0.2s ease, padding-left 0.25s ease;
    white-space: nowrap;
}

.insights-nav-dropdown-panel a:hover {
    color: var(--text);
    background: rgba(8, 126, 139, 0.12);
    padding-left: 22px;
}

.insights-nav-dropdown-panel a.active {
    color: var(--coral);
    background: rgba(255, 90, 95, 0.06);
}

/* Hide old hamburger toggle entirely */
.insights-nav-toggle {
    display: none !important;
}

/* === Responsive breakpoints — phủ MỌI iPhone =================
   Sử dụng strategy: thu nhỏ font/padding ở mỗi breakpoint
   ============================================================ */

/* Tablet & medium phones: 768px (Pro Max iPhone landscape...) */
@media (max-width: 900px) {
    .insights-nav-inner {
        padding: 14px 20px !important;
        gap: 12px !important;
    }

    .insights-logo-text {
        font-size: 16px;
        letter-spacing: 3px;
    }
}

/* Large iPhones: 481-767px */
@media (max-width: 767px) {
    .insights-nav-inner {
        padding: 12px 16px !important;
        gap: 8px !important;
    }

    .insights-logo-text {
        font-size: 15px;
        letter-spacing: 2.5px;
    }

    .insights-nav-links {
        gap: 2px !important;
    }

    .insights-nav .insights-nav-links>a,
    .insights-nav-dropdown-btn {
        font-size: 12px;
        letter-spacing: 1.2px;
        padding: 8px 11px;
    }
}

/* Standard iPhones: 391-480px (covers iPhone 16 Pro Max 440px, 16 Plus 430, 14/15 Pro Max 430) */
@media (max-width: 480px) {
    .insights-nav-inner {
        padding: 11px 14px !important;
        gap: 6px !important;
    }

    .insights-logo-text {
        font-size: 14px;
        letter-spacing: 2px;
    }

    .insights-nav-links {
        gap: 0px !important;
    }

    .insights-nav .insights-nav-links>a,
    .insights-nav-dropdown-btn {
        font-size: 11px;
        letter-spacing: 1px;
        padding: 8px 9px;
    }

    .insights-nav-dropdown-panel {
        min-width: 200px;
        right: -8px;
    }

    .insights-nav-dropdown-panel a {
        font-size: 13px;
        padding: 12px 14px;
    }
}

/* Small iPhones: 360-390 (iPhone 13 mini, SE, 14, 15, 16 base 390-393) */
@media (max-width: 400px) {
    .insights-nav-inner {
        padding: 10px 12px !important;
        gap: 4px !important;
    }

    .insights-logo-text {
        font-size: 13px;
        letter-spacing: 1.5px;
    }

    .insights-nav .insights-nav-links>a,
    .insights-nav-dropdown-btn {
        font-size: 10.5px;
        letter-spacing: 0.8px;
        padding: 7px 7px;
    }
}

/* Tiny iPhones: <360 (iPhone SE 1st gen 320, very rare) */
@media (max-width: 359px) {
    .insights-nav-inner {
        padding: 9px 10px !important;
    }

    .insights-logo-text {
        font-size: 12px;
        letter-spacing: 1px;
    }

    .insights-nav .insights-nav-links>a,
    .insights-nav-dropdown-btn {
        font-size: 10px;
        letter-spacing: 0.5px;
        padding: 6px 6px;
    }
}

/* === HERO === */
.insights-hero {
    padding: 120px 32px 80px;
    text-align: center;
    background: linear-gradient(180deg, var(--bg) 0%, var(--bg2) 100%);
    border-bottom: 1px solid var(--border);
}

.insights-hero-inner {
    max-width: 800px;
    margin: 0 auto;
}

.insights-hero-eyebrow {
    font-size: 13px;
    letter-spacing: 4px;
    color: var(--teal2);
    margin-bottom: 24px;
    font-weight: 500;
}

.insights-hero-title {
    font-family: 'Montserrat', 'Be Vietnam Pro', sans-serif;
    font-size: clamp(56px, 9vw, 96px);
    font-weight: 800;
    letter-spacing: -2px;
    line-height: 1;
    margin-bottom: 24px;
    background: linear-gradient(135deg, var(--text) 0%, var(--pastel) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.insights-hero-subtitle {
    font-size: 18px;
    line-height: 1.7;
    color: var(--muted);
    max-width: 600px;
    margin: 0 auto;
}

.insights-hero-italic {
    color: var(--coral);
    font-style: italic;
    font-weight: 500;
}

@media (max-width: 768px) {
    .insights-hero {
        padding: 80px 18px 60px;
    }

    .insights-hero-subtitle {
        font-size: 15px;
    }
}

/* === MAIN === */
.insights-main {
    padding: 80px 32px;
    min-height: 60vh;
}

.insights-container {
    max-width: 1200px;
    margin: 0 auto;
}

/* === FILTER === */
.insights-filter {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 64px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border);
}

.insights-filter-btn {
    padding: 10px 20px;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--muted);
    font-family: 'Be Vietnam Pro', sans-serif;
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.5px;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.insights-filter-btn:hover {
    color: var(--text);
    border-color: var(--teal);
}

.insights-filter-btn.active {
    color: var(--text);
    background: var(--teal);
    border-color: var(--teal);
}

/* === POSTS GRID === */
.insights-posts {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 32px;
}

@media (max-width: 768px) {
    .insights-posts {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .insights-main {
        padding: 60px 18px;
    }
}

/* === POST CARD === */
.insights-post-card {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
}

.insights-post-card:hover {
    transform: translateY(-4px);
    border-color: var(--teal);
    box-shadow: 0 20px 40px rgba(8, 126, 139, 0.15);
}

.insights-post-link {
    display: block;
    padding: 32px;
    text-decoration: none;
    color: inherit;
    height: 100%;
}

.insights-post-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    font-size: 12px;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.insights-post-cat {
    color: var(--coral);
    font-weight: 600;
}

.insights-post-date {
    color: var(--muted);
}

.insights-post-title {
    font-family: 'Montserrat', 'Be Vietnam Pro', sans-serif;
    font-size: 22px;
    font-weight: 700;
    line-height: 1.3;
    color: var(--text);
    margin-bottom: 16px;
    transition: color 0.3s ease;
}

.insights-post-card:hover .insights-post-title {
    color: var(--pastel);
}

.insights-post-title-muted {
    color: var(--muted);
}

.insights-post-excerpt {
    font-size: 15px;
    line-height: 1.7;
    color: var(--muted);
    margin-bottom: 28px;
}

.insights-post-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

.insights-post-readtime {
    font-size: 12px;
    color: var(--muted);
    letter-spacing: 0.5px;
}

.insights-post-arrow {
    font-size: 20px;
    color: var(--teal2);
    transition: transform 0.3s ease;
}

.insights-post-card:hover .insights-post-arrow {
    transform: translateX(4px);
}

.insights-post-card-coming {
    opacity: 0.55;
    pointer-events: none;
    border-style: dashed;
}

.insights-post-card-coming:hover {
    transform: none;
    box-shadow: none;
    border-color: var(--border);
}

/* === FOOTER NOTE === */
.insights-footer-note {
    margin-top: 80px;
    padding: 40px;
    text-align: center;
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: 12px;
}

.insights-footer-note p {
    font-size: 15px;
    line-height: 1.8;
    color: var(--muted);
    margin: 0;
}

.insights-footer-note p+p {
    margin-top: 16px;
}

.insights-footer-note a {
    color: var(--teal2);
    text-decoration: none;
    border-bottom: 1px solid var(--teal);
    transition: color 0.3s ease;
}

.insights-footer-note a:hover {
    color: var(--coral);
    border-color: var(--coral);
}

/* === FOOTER === */
.insights-footer {
    border-top: 1px solid var(--border);
    padding: 60px 32px 40px;
    background: var(--bg2);
    margin-top: 80px;
}

.insights-footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.insights-footer-brand {
    font-family: 'Montserrat', 'Be Vietnam Pro', sans-serif;
    font-weight: 800;
    font-size: 24px;
    letter-spacing: 6px;
    color: var(--text);
    margin-bottom: 24px;
}

.insights-footer-brand em {
    font-style: italic;
    color: var(--coral);
    font-weight: 800;
}

.insights-footer-links {
    display: flex;
    gap: 32px;
    justify-content: center;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.insights-footer-links a {
    font-size: 14px;
    color: var(--muted);
    text-decoration: none;
    letter-spacing: 0.5px;
    transition: color 0.3s ease;
}

.insights-footer-links a:hover {
    color: var(--teal2);
}

.insights-footer-meta {
    color: var(--muted);
    font-size: 13px;
    line-height: 1.8;
}

.insights-footer-meta p {
    margin: 4px 0;
}

/* ==========================================================
   POST DETAIL PAGE — bài viết riêng lẻ
   ========================================================== */

.post-detail {
    padding: 60px 32px 80px;
    max-width: 760px;
    margin: 0 auto;
}

.post-detail-meta {
    display: flex;
    gap: 16px;
    align-items: center;
    margin-bottom: 32px;
    font-size: 13px;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.post-detail-cat {
    color: var(--coral);
    font-weight: 600;
    background: rgba(255, 90, 95, 0.1);
    padding: 4px 12px;
    border-radius: 50px;
}

.post-detail-date {
    color: var(--muted);
}

.post-detail-readtime {
    color: var(--muted);
}

.post-detail-title {
    font-family: 'Montserrat', 'Be Vietnam Pro', sans-serif;
    font-size: clamp(36px, 6vw, 56px);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -1.5px;
    color: var(--text);
    margin-bottom: 32px;
}

.post-detail-lead {
    font-size: 22px;
    line-height: 1.6;
    color: var(--pastel);
    margin-bottom: 48px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border);
    font-style: italic;
}

.post-detail-content {
    font-size: 18px;
    line-height: 1.85;
    color: var(--text);
}

.post-detail-content p {
    margin-bottom: 24px;
}

.post-detail-content h2 {
    font-family: 'Montserrat', 'Be Vietnam Pro', sans-serif;
    font-size: 32px;
    font-weight: 700;
    line-height: 1.3;
    color: var(--text);
    margin-top: 64px;
    margin-bottom: 24px;
    padding-top: 32px;
    border-top: 1px solid var(--border);
}

.post-detail-content h3 {
    font-family: 'Montserrat', 'Be Vietnam Pro', sans-serif;
    font-size: 22px;
    font-weight: 700;
    color: var(--pastel);
    margin-top: 40px;
    margin-bottom: 16px;
}

.post-detail-content blockquote {
    border-left: 3px solid var(--teal);
    padding: 8px 0 8px 24px;
    margin: 32px 0;
    font-style: italic;
    color: var(--pastel);
    font-size: 22px;
    line-height: 1.6;
}

.post-detail-content em,
.post-detail-content i {
    color: var(--pastel);
    font-style: italic;
}

.post-detail-content strong,
.post-detail-content b {
    color: var(--coral);
    font-weight: 600;
}

.post-detail-content ul,
.post-detail-content ol {
    margin: 24px 0;
    padding-left: 24px;
}

.post-detail-content li {
    margin-bottom: 12px;
}

.post-detail-content hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 48px 0;
}

/* Inline code */
.post-detail-content code {
    background: var(--bg3);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--coral);
    font-family: 'SF Mono', 'Monaco', monospace;
}

/* === END CTA — chỉ hiện khi bài có upsell === */
.post-end-cta {
    margin-top: 80px;
    padding: 48px;
    background: linear-gradient(135deg, var(--bg2), var(--bg3));
    border: 1px solid var(--border2);
    border-radius: 12px;
    text-align: center;
}

.post-end-cta-eyebrow {
    font-size: 12px;
    letter-spacing: 3px;
    color: var(--teal2);
    margin-bottom: 16px;
    font-weight: 600;
}

.post-end-cta-title {
    font-family: 'Montserrat', 'Be Vietnam Pro', sans-serif;
    font-size: 28px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 16px;
    line-height: 1.3;
}

.post-end-cta-text {
    font-size: 16px;
    line-height: 1.7;
    color: var(--muted);
    margin-bottom: 32px;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
}

.post-end-cta-btn {
    display: inline-block;
    padding: 16px 36px;
    background: var(--crimson);
    color: var(--text);
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    letter-spacing: 1px;
    font-size: 14px;
    transition: all 0.3s ease;
}

.post-end-cta-btn:hover {
    background: var(--crimson-deep);
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(200, 29, 37, 0.3);
}

/* === BACK BUTTON === */
.post-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--muted);
    text-decoration: none;
    font-size: 14px;
    letter-spacing: 0.5px;
    margin-bottom: 48px;
    transition: color 0.3s ease;
}

.post-back:hover {
    color: var(--teal2);
}

.post-back::before {
    content: '←';
    font-size: 18px;
}

/* === RESPONSIVE post detail === */
@media (max-width: 768px) {
    .post-detail {
        padding: 40px 18px 60px;
    }

    .post-detail-content {
        font-size: 16px;
    }

    .post-detail-content h2 {
        font-size: 24px;
    }

    .post-detail-content blockquote {
        font-size: 18px;
        padding-left: 18px;
    }

    .post-detail-lead {
        font-size: 18px;
    }

    .post-end-cta {
        padding: 32px 24px;
    }

    .post-end-cta-title {
        font-size: 22px;
    }
}