/* HelioPeak Blog — Shared stylesheet */
/* Inherits from main site: DM Sans, dark theme, #ff9900 accent */

:root {
    --bg: #0a0a0a;
    --bg-card: #141414;
    --bg-card-hover: #1a1a1a;
    --text: #f0f0f0;
    --text-secondary: #888;
    --text-tertiary: #666;
    --accent: #ff9900;
    --accent-glow: rgba(255, 153, 0, 0.15);
    --gradient-start: #ffd900;
    --gradient-end: #ff8000;
    --green: #34c759;
    --radius: 16px;
    --radius-small: 10px;
    --max-width: 800px;
    --max-width-wide: 1100px;
    --max-width-index: 1240px;
}

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

body {
    font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 0;
}

section, header, footer, main, nav { position: relative; z-index: 1; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: var(--max-width-wide); margin: 0 auto; padding: 0 24px; }

/* === NAV with hamburger === */
nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    background: rgba(10, 10, 10, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text);
}

.nav-brand img {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

.nav-links {
    display: flex;
    gap: 28px;
    list-style: none;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--text);
    text-decoration: none;
}

.nav-links a.nav-blog-link {
    position: relative;
    color: var(--text);
}

.nav-links a.nav-blog-link::after {
    content: 'NEW';
    position: absolute;
    top: -10px;
    right: -28px;
    background: var(--accent);
    color: #000;
    font-size: 0.55rem;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 100px;
    letter-spacing: 0.5px;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
    background: none;
    border: none;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: transform 0.3s, opacity 0.3s;
    border-radius: 2px;
}

.hamburger.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 768px) {
    .hamburger { display: flex; }
    .nav-links {
        position: fixed;
        top: 64px;
        left: 0; right: 0;
        background: rgba(10, 10, 10, 0.97);
        backdrop-filter: blur(20px);
        flex-direction: column;
        gap: 0;
        padding: 12px 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: transform 0.3s, opacity 0.3s;
    }
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }
    .nav-links li {
        width: 100%;
    }
    .nav-links a {
        display: block;
        padding: 14px 24px;
        font-size: 1rem;
    }
    .nav-links a.nav-blog-link::after {
        position: static;
        margin-left: 12px;
        display: inline-block;
    }
}

/* === Blog index page === */
.blog-hero {
    padding: 140px 0 60px;
    text-align: center;
    background: radial-gradient(ellipse 60% 50% at 50% 0%, var(--accent-glow), transparent);
}

.blog-hero h1 {
    font-size: clamp(2rem, 4.5vw, 2.8rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 14px;
}

.blog-hero h1 span {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.blog-hero p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 640px;
    margin: 0 auto 16px;
}

.blog-hero .author-line {
    font-size: 0.92rem;
    color: var(--text-tertiary);
    margin-top: 8px;
}

/* === Language selector === */
.lang-selector {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin: 32px auto 0;
    flex-wrap: wrap;
    max-width: 540px;
}

.lang-selector a {
    padding: 6px 14px;
    border-radius: 100px;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s;
}

.lang-selector a:hover {
    border-color: var(--accent);
    color: var(--text);
    text-decoration: none;
}

.lang-selector a.active {
    background: var(--accent);
    color: #000;
    border-color: var(--accent);
}

.translation-notice {
    text-align: center;
    margin: 16px auto 0;
    max-width: 640px;
    font-size: 0.78rem;
    color: var(--text-tertiary);
    font-style: italic;
    padding: 0 24px;
}

.translation-notice a {
    color: var(--text-tertiary);
    text-decoration: underline;
}

/* === Article grid on blog index === */
.blog-grid-section {
    padding: 60px 0 80px;
}

.blog-grid-section .container {
    max-width: var(--max-width-index);
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.blog-card {
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius);
    padding: 28px 24px;
    transition: background 0.2s, border-color 0.2s, transform 0.2s;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.blog-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(255, 153, 0, 0.3);
    transform: translateY(-2px);
    text-decoration: none;
}

.blog-card-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.blog-card-number {
    background: var(--accent);
    color: #000;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 100px;
    font-size: 0.7rem;
}

.blog-card-category {
    color: var(--accent);
    font-weight: 600;
}

.blog-card h2 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text);
    line-height: 1.4;
    margin: 0;
}

.blog-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.55;
    margin: 0;
}

.blog-card-readtime {
    margin-top: auto;
    font-size: 0.78rem;
    color: var(--text-tertiary);
    padding-top: 8px;
}

/* === Article page === */
.article-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 120px 24px 60px;
}

.article-breadcrumbs {
    font-size: 0.82rem;
    color: var(--text-tertiary);
    margin-bottom: 24px;
}

.article-breadcrumbs a {
    color: var(--text-tertiary);
}

.article-breadcrumbs a:hover {
    color: var(--accent);
}

.article-header {
    margin-bottom: 40px;
    padding-bottom: 32px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    font-size: 0.8rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 18px;
}

.article-meta-category {
    background: rgba(255, 153, 0, 0.12);
    color: var(--accent);
    padding: 4px 10px;
    border-radius: 100px;
    font-weight: 600;
}

.article-meta-readtime::before {
    content: '·';
    margin-right: 14px;
    color: var(--text-tertiary);
}

article h1 {
    font-size: clamp(1.8rem, 4vw, 2.4rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.25;
    margin-bottom: 0;
}

.article-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 400;
    line-height: 1.5;
    margin-top: 12px;
    margin-bottom: 0;
}

article h2 {
    font-size: 1.45rem;
    font-weight: 600;
    margin: 48px 0 16px;
    letter-spacing: -0.01em;
    line-height: 1.35;
}

article h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 32px 0 12px;
    color: var(--text);
}

article p {
    margin-bottom: 18px;
    color: var(--text);
    font-size: 1.02rem;
    line-height: 1.75;
}

article ul, article ol {
    margin-bottom: 18px;
    padding-left: 24px;
}

article li {
    color: var(--text);
    margin-bottom: 8px;
    font-size: 1.02rem;
    line-height: 1.7;
}

article strong {
    color: var(--text);
    font-weight: 600;
}

article em {
    color: var(--text-secondary);
    font-style: italic;
}

article a {
    color: var(--accent);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
}

article a:hover {
    color: var(--gradient-start);
}

article code {
    background: var(--bg-card);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'SF Mono', Monaco, Consolas, monospace;
    font-size: 0.88em;
    border: 1px solid rgba(255, 255, 255, 0.06);
}

article blockquote {
    border-left: 3px solid var(--accent);
    padding-left: 20px;
    margin: 24px 0;
    color: var(--text-secondary);
    font-style: italic;
}

/* === Inline images in articles === */
.article-image {
    margin: 32px 0;
    text-align: center;
}

.article-image img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-small);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.article-image-phone img {
    max-width: 320px;
    margin: 0 auto;
    display: block;
}

.article-image-dashboard img {
    max-width: 100%;
}

.article-image-caption {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    margin-top: 12px;
    font-style: italic;
    text-align: center;
}

/* === Article byline === */
.article-byline {
    margin-top: 56px;
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    display: flex;
    align-items: center;
    gap: 16px;
}

.article-byline-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    flex-shrink: 0;
}

.article-byline-text {
    flex: 1;
}

.article-byline-name {
    font-weight: 600;
    font-size: 1rem;
    color: var(--text);
    margin: 0 0 4px;
}

.article-byline-bio {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
}

/* === Previous/Next navigation === */
.article-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 48px;
}

.article-nav a {
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-small);
    padding: 20px 22px;
    transition: background 0.2s, border-color 0.2s, transform 0.2s;
    text-decoration: none;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.article-nav a:hover {
    background: var(--bg-card-hover);
    border-color: rgba(255, 153, 0, 0.3);
    transform: translateY(-2px);
    text-decoration: none;
}

.article-nav-label {
    font-size: 0.78rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.article-nav-title {
    color: var(--text);
    font-weight: 500;
    font-size: 0.95rem;
    line-height: 1.4;
}

.article-nav .prev {
    text-align: left;
}

.article-nav .next {
    text-align: right;
}

.article-nav a:only-child {
    grid-column: 1 / -1;
}

.article-nav .placeholder {
    visibility: hidden;
}

@media (max-width: 600px) {
    .article-nav {
        grid-template-columns: 1fr;
    }
    .article-nav .next {
        text-align: left;
    }
}

/* === Back to index link === */
.back-to-index {
    display: inline-block;
    margin-top: 32px;
    padding: 10px 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 100px;
    color: var(--text-secondary);
    font-size: 0.88rem;
    transition: all 0.2s;
}

.back-to-index:hover {
    border-color: var(--accent);
    color: var(--text);
    text-decoration: none;
}

/* === Footer === */
footer {
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding: 32px 0;
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.85rem;
}

footer .container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

footer ul {
    display: flex;
    gap: 20px;
    list-style: none;
}

footer ul a {
    color: var(--text-tertiary);
}

footer ul a:hover {
    color: var(--accent);
}

@media (max-width: 600px) {
    footer .container {
        flex-direction: column;
        gap: 12px;
    }
}

/* === Fade-in animation === */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s, transform 0.6s;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}