/* WattPlan Marketing - Shared Styles
   Design System: "Silent Precision" - Industrial functionalism
   Philosophy: "Less, but better" (Dieter Rams)
*/

/* ============================================
   CSS VARIABLES
   ============================================ */
:root {
    /* Colors - WattPlan Palette */
    --c-bunker: #101119;
    --c-anthracite: #1A1C23;
    --c-porcelain: #edf2f4;
    --c-bali-hai: #8d99ae;
    --c-valencia: #d94a4a;
    --c-rob-roy: #ecd16c;
    --c-pastel-green: #68d573;

    /* Typography */
    --font-primary: 'Roboto', sans-serif;
    --font-mono: 'Roboto Mono', monospace;

    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    --spacing-4xl: 96px;

    /* Layout */
    --max-width: 1200px;
    --max-width-narrow: 800px;
    --max-width-content: 960px;

    /* Borders */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --border-subtle: 1px solid rgba(141, 153, 174, 0.1);
    --border-light: 1px solid rgba(141, 153, 174, 0.2);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
}

/* ============================================
   RESET & BASE
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
}

* {
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--c-porcelain);
    background-color: var(--c-bunker);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

ul, ol {
    list-style: none;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 900;
    line-height: 1.2;
    letter-spacing: -0.02em;
    text-transform: uppercase;
}

h1 {
    font-size: clamp(36px, 5vw, 56px);
}

h2 {
    font-size: clamp(28px, 4vw, 40px);
}

h3 {
    font-size: clamp(20px, 3vw, 28px);
}

h4 {
    font-size: 20px;
}

p {
    color: var(--c-bali-hai);
}

.text-muted {
    color: var(--c-bali-hai);
}

.text-accent {
    color: var(--c-rob-roy);
}

.text-center {
    text-align: center;
}

/* ============================================
   LAYOUT
   ============================================ */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.container--narrow {
    max-width: var(--max-width-narrow);
}

.container--content {
    max-width: var(--max-width-content);
}

.section {
    padding: var(--spacing-4xl) 0;
}

.section--tight {
    padding: var(--spacing-3xl) 0;
}

/* ============================================
   HEADER / NAVIGATION
   ============================================ */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(16, 17, 25, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: var(--border-subtle);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.site-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.site-logo img {
    height: 32px;
    width: auto;
}

.site-logo__wordmark {
    height: 24px;
    width: auto;
    filter: invert(1);
}

.site-logo__text {
    font-weight: 700;
    font-size: 18px;
    color: var(--c-porcelain);
}

.nav-main {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav-main__link {
    font-size: 14px;
    font-weight: 500;
    color: var(--c-bali-hai);
    transition: color var(--transition-fast);
}

.nav-main__link:hover,
.nav-main__link--active {
    color: var(--c-porcelain);
}

.nav-cta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}
.nav-cta--mobile {
    display: none;
}

/* Mobile Nav Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--c-porcelain);
    transition: var(--transition-fast);
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-main {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--c-bunker);
        flex-direction: column;
        align-items: flex-start;
        padding: var(--spacing-xl);
        gap: var(--spacing-lg);
        transform: translateX(100%);
        transition: transform var(--transition-normal);
    }

    .nav-main.is-open {
        transform: translateX(0);
    }

    .nav-main__link {
        font-size: 18px;
    }

    .nav-cta {
        display: none;
    }

    .nav-cta--mobile {
        display: flex;
        flex-direction: column;
        width: 100%;
        margin-top: var(--spacing-lg);
    }
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 12px 24px;
    font-family: var(--font-primary);
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn--primary {
    background: var(--c-valencia);
    color: var(--c-porcelain);
}

.btn--primary:hover {
    background: #e65c5c;
}

.btn--secondary {
    background: var(--c-rob-roy);
    color: var(--c-bunker);
}

.btn--secondary:hover {
    background: #f5dc85;
}

.btn--outline {
    background: transparent;
    border: 1px solid rgba(141, 153, 174, 0.3);
    color: var(--c-porcelain);
}

.btn--outline:hover {
    border-color: rgba(141, 153, 174, 0.5);
}

.btn--ghost {
    background: transparent;
    color: var(--c-porcelain);
}

.btn--ghost:hover {
    color: var(--c-rob-roy);
}

.btn--large {
    padding: 16px 32px;
    font-size: 16px;
}

.btn--small {
    padding: 8px 16px;
    font-size: 13px;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 72px;
}

.hero__bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.hero__bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        to bottom,
        rgba(16, 17, 25, 0.7) 0%,
        rgba(16, 17, 25, 0.85) 50%,
        rgba(16, 17, 25, 1) 100%
    );
}

.hero__content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 720px;
    padding: var(--spacing-2xl);
}

.hero__tagline {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--c-rob-roy);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: var(--spacing-md);
}

.hero__title {
    margin-bottom: var(--spacing-lg);
}

.hero__subtitle {
    font-size: 18px;
    color: var(--c-bali-hai);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}

.hero__cta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
}

/* ============================================
   CARDS
   ============================================ */
.card {
    background: var(--c-anthracite);
    border: var(--border-subtle);
    border-radius: var(--radius-md);
    padding: var(--spacing-xl);
    transition: border-color var(--transition-fast);
}

.card:hover {
    border-color: rgba(141, 153, 174, 0.25);
}

.card--feature {
    text-align: center;
}

.card__icon {
    width: 48px;
    height: 48px;
    margin-bottom: var(--spacing-md);
    color: var(--c-rob-roy);
}

.card__title {
    font-size: 18px;
    margin-bottom: var(--spacing-sm);
}

.card__description {
    font-size: 14px;
    line-height: 1.6;
}

/* Card Grid */
.card-grid {
    display: grid;
    gap: var(--spacing-lg);
}

.card-grid--3 {
    grid-template-columns: repeat(3, 1fr);
}

.card-grid--2 {
    grid-template-columns: repeat(2, 1fr);
}

@media (max-width: 768px) {
    .card-grid--3,
    .card-grid--2 {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   FEATURE SECTIONS
   ============================================ */
.feature-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.feature-row--reverse {
    direction: rtl;
}

.feature-row--reverse > * {
    direction: ltr;
}

.feature-row__content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.feature-row__label {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--c-rob-roy);
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

.feature-row__title {
    font-size: 32px;
}

.feature-row__description {
    font-size: 16px;
    line-height: 1.7;
}

.feature-row__image {
    border-radius: var(--radius-md);
    border: var(--border-subtle);
    overflow: hidden;
}

.feature-row__image img {
    width: 100%;
}

@media (max-width: 900px) {
    .feature-row {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .feature-row--reverse {
        direction: ltr;
    }
}

/* ============================================
   PRICING
   ============================================ */
.pricing-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    max-width: 700px;
    margin: 0 auto;
}

@media (max-width: 600px) {
    .pricing-cards {
        grid-template-columns: 1fr;
    }
}

.pricing-card {
    background: var(--c-anthracite);
    border: var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
}

.pricing-card--featured {
    border-color: var(--c-rob-roy);
    position: relative;
}

.pricing-card__badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--c-rob-roy);
    color: var(--c-bunker);
    padding: 4px 14px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.pricing-card__name {
    font-size: 20px;
    font-weight: 900;
    text-transform: uppercase;
    margin-bottom: 4px;
}

.pricing-card__desc {
    font-size: 13px;
    color: var(--c-bali-hai);
    margin-bottom: var(--spacing-lg);
}

.pricing-card__price {
    display: flex;
    align-items: baseline;
    gap: 4px;
    margin-bottom: var(--spacing-lg);
}

.pricing-card__amount {
    font-size: 36px;
    font-weight: 700;
}

.pricing-card__period {
    font-size: 14px;
    color: var(--c-bali-hai);
}

.pricing-card__features {
    flex: 1;
    margin-bottom: var(--spacing-lg);
}

.pricing-card__features li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 13px;
    margin-bottom: 12px;
}

.pricing-card__features li::before {
    content: "";
    width: 16px;
    height: 16px;
    background: rgba(104, 213, 115, 0.2);
    border-radius: 50%;
    flex-shrink: 0;
    margin-top: 2px;
}

/* ============================================
   FAQ / ACCORDION
   ============================================ */
.faq-category {
    margin-bottom: var(--spacing-3xl);
}

.faq-category__title {
    font-size: 24px;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: var(--border-light);
}

.accordion {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.accordion-item {
    background: var(--c-anthracite);
    border: var(--border-subtle);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.accordion-trigger {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    background: none;
    border: none;
    color: var(--c-porcelain);
    font-family: var(--font-primary);
    font-size: 16px;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.accordion-trigger:hover {
    background: rgba(141, 153, 174, 0.05);
}

.accordion-trigger__icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    color: var(--c-bali-hai);
    transition: transform var(--transition-fast);
}

.accordion-item.is-open .accordion-trigger__icon {
    transform: rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
}

.accordion-item.is-open .accordion-content {
    max-height: 500px;
}

.accordion-content__inner {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    color: var(--c-bali-hai);
    font-size: 15px;
    line-height: 1.7;
}

.accordion-content__inner a {
    color: var(--c-rob-roy);
    text-decoration: underline;
}

.accordion-content__inner a:hover {
    color: var(--c-porcelain);
}

/* ============================================
   BLOG
   ============================================ */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

@media (max-width: 900px) {
    .blog-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .blog-grid {
        grid-template-columns: 1fr;
    }
}

.blog-card {
    background: var(--c-anthracite);
    border: var(--border-subtle);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color var(--transition-fast);
}

.blog-card:hover {
    border-color: rgba(141, 153, 174, 0.25);
}

.blog-card__image {
    aspect-ratio: 16/9;
    overflow: hidden;
    background: var(--c-bunker);
}

.blog-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.blog-card__content {
    padding: var(--spacing-lg);
}

.blog-card__category {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--c-rob-roy);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-xs);
}

.blog-card__title {
    font-size: 18px;
    margin-bottom: var(--spacing-sm);
    line-height: 1.3;
}

.blog-card__excerpt {
    font-size: 14px;
    color: var(--c-bali-hai);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.blog-card__meta {
    font-size: 12px;
    color: var(--c-bali-hai);
}

/* Article */
.article {
    max-width: var(--max-width-content);
    margin: 0 auto;
    padding: var(--spacing-4xl) var(--spacing-lg);
}

.article__header {
    margin-bottom: var(--spacing-lg);
}

.article__category {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--c-rob-roy);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: var(--spacing-md);
}

.article__title {
    font-size: clamp(28px, 4vw, 40px);
    margin-bottom: var(--spacing-md);
}

.article__meta {
    font-size: 14px;
    color: var(--c-bali-hai);
    margin-bottom: 0;
}

.article__content {
    font-size: 17px;
    line-height: 1.8;
}

.article__content h2 {
    font-size: 28px;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-sm);
}

.article__content h3 {
    font-size: 22px;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.article__content p {
    color: var(--c-porcelain);
    margin-bottom: var(--spacing-md);
}

.article__content ul,
.article__content ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

.article__content li {
    margin-bottom: var(--spacing-xs);
}

.article__content ul li {
    list-style: disc;
}

.article__content ol li {
    list-style: decimal;
}

.article__content a {
    color: var(--c-rob-roy);
    text-decoration: underline;
}

.article__content blockquote {
    border-left: 3px solid var(--c-rob-roy);
    padding-left: var(--spacing-lg);
    margin: var(--spacing-md) 0;
    font-style: italic;
    color: var(--c-bali-hai);
}

.article__content code {
    font-family: var(--font-mono);
    background: var(--c-anthracite);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: 0.9em;
}

.article__content pre {
    background: var(--c-anthracite);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin-bottom: var(--spacing-lg);
}

.article__content pre code {
    background: none;
    padding: 0;
}

.article__content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--spacing-md);
    font-size: 15px;
}

.article__content th,
.article__content td {
    padding: 10px 14px;
    text-align: left;
    border-bottom: 1px solid rgba(141, 153, 174, 0.15);
}

.article__content th {
    font-weight: 500;
    color: var(--c-rob-roy);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.article__content td {
    color: var(--c-porcelain);
}

.article__content tbody tr:hover {
    background: rgba(141, 153, 174, 0.05);
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
    background: var(--c-anthracite);
    border-top: var(--border-subtle);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

@media (max-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-xl);
    }
}

@media (max-width: 480px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.footer-brand__logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer-brand__logo img {
    height: 28px;
}

.footer-brand__logo .footer-wordmark {
    height: 20px;
    filter: invert(1);
}

.footer-brand__logo span {
    font-weight: 700;
    font-size: 16px;
}

.footer-brand__desc {
    font-size: 14px;
    color: var(--c-bali-hai);
    max-width: 280px;
}

.footer-column__title {
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-md);
}

.footer-column__links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-column__link {
    font-size: 14px;
    color: var(--c-bali-hai);
    transition: color var(--transition-fast);
}

.footer-column__link:hover {
    color: var(--c-porcelain);
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--spacing-xl);
    border-top: var(--border-subtle);
}

@media (max-width: 600px) {
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
}

.footer-copyright {
    font-size: 13px;
    color: var(--c-bali-hai);
}

.footer-social {
    display: flex;
    gap: var(--spacing-md);
}

.footer-social__link {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(141, 153, 174, 0.1);
    color: var(--c-bali-hai);
    transition: all var(--transition-fast);
}

.footer-social__link:hover {
    background: var(--c-rob-roy);
    color: var(--c-bunker);
}

.footer-social__link svg {
    width: 18px;
    height: 18px;
}

/* ============================================
   CTA SECTION
   ============================================ */
.cta-section {
    background: linear-gradient(135deg, var(--c-anthracite) 0%, var(--c-bunker) 100%);
    border-top: var(--border-subtle);
    border-bottom: var(--border-subtle);
    text-align: center;
    padding: var(--spacing-4xl) 0;
}

.cta-section__title {
    margin-bottom: var(--spacing-md);
}

.cta-section__subtitle {
    font-size: 18px;
    color: var(--c-bali-hai);
    margin-bottom: var(--spacing-xl);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

/* ============================================
   UTILITIES
   ============================================ */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }