/* ==========================================================================
   DESIGN VARIABLES & SYSTEM
   ========================================================================== */
:root {
    /* Fonts */
    --font-heading: 'Space Grotesk', sans-serif;
    --font-serif: 'Cormorant Garamond', serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;
    --font-mono: 'Space Mono', monospace;

    /* Elegant Pure Dark Theme */
    --bg-primary: #000000;
    --bg-secondary: #080808;
    --text-primary: #ffffff;
    --text-secondary: #8e8e93;
    --text-muted: #555555;
    --border-color: #222222;
    --border-hover: #ffffff;
    --card-bg: #000000;
    
    --transition-speed: 0.2s;
    --transition-fn: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ==========================================================================
   BASE & RESET RULES
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    background-color: var(--bg-primary);
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* Custom Minimalist Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

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

/* Helper Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ==========================================================================
   HEADER & NAVIGATION
   ========================================================================== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: border-color var(--transition-speed) ease;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: padding var(--transition-speed) ease, flex-direction var(--transition-speed) ease;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 12px;
}

.ecell-logo {
    height: 36px;
    width: auto;
    filter: grayscale(1) invert(1);
}

.logo-text {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.15rem;
    letter-spacing: -0.01em;
    color: var(--text-primary);
}

.logo-text-sub {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 1px 6px;
    margin-left: 6px;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-item {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    position: relative;
    padding: 4px 0;
    transition: color var(--transition-speed) ease;
}

.nav-item:hover {
    color: var(--text-primary);
}

.nav-item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--text-primary);
    transition: width var(--transition-speed) ease;
}

.nav-item:hover::after {
    width: 100%;
}

/* ==========================================================================
   HERO SECTION (CENTERED & STREAMLINED)
   ========================================================================== */
.hero-section {
    padding: clamp(120px, 15vh, 200px) 24px clamp(100px, 10vh, 140px) 24px;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.hero-wrapper {
    width: 100%;
    max-width: 1000px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-org {
    font-family: var(--font-serif);
    font-size: clamp(2.4rem, 6vw, 3.2rem);
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
    letter-spacing: -0.01em;
    line-height: 1.1;
}

.hero-tag {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    text-transform: uppercase;
    margin-bottom: clamp(32px, 5vh, 48px);
    border: 1px solid var(--border-color);
    padding: 3px 12px;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(1.4rem, 4.2vw, 3.8rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: clamp(28px, 4vh, 36px);
    text-transform: uppercase;
    color: var(--text-primary);
    white-space: nowrap;
}

.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.15rem);
    color: var(--text-secondary);
    max-width: 680px;
    margin-bottom: clamp(36px, 5vh, 48px);
    line-height: 1.65;
}

.cta-button {
    display: inline-block;
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 0.9rem;
    padding: 14px 36px;
    border: 1px solid var(--border-color);
    cursor: pointer;
    background-color: transparent;
    color: var(--text-primary);
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

.cta-button.primary {
    border-color: var(--text-primary);
}

.cta-button.primary:hover {
    background-color: var(--text-primary);
    color: var(--bg-primary);
    border-color: var(--text-primary);
}

/* ==========================================================================
   CLUSTERS SECTION
   ========================================================================== */
.clusters-section {
    padding: clamp(60px, 8vw, 100px) 24px;
    max-width: 1200px;
    margin: 0 auto;
    border-top: 1px solid var(--border-color);
}

.section-header {
    margin-bottom: clamp(40px, 6vw, 64px);
    text-align: center;
}

.section-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, 2.8rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    text-transform: uppercase;
}

.clusters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: clamp(20px, 3vw, 32px);
    width: 100%;
}

.cluster-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    box-shadow: 3px 3px 0px var(--border-color);
    padding: clamp(24px, 4vw, 36px);
    display: flex;
    flex-direction: column;
    gap: 20px;
    transition: border-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.cluster-card:hover {
    box-shadow: 3px 3px 0px var(--text-primary);
    border-color: var(--border-hover);
}

.cluster-header {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.cluster-name {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 700;
    line-height: 1.2;
}

.cluster-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
    flex-grow: 1;
}

.apply-btn {
    display: block;
    width: 100%;
    text-align: center;
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 0.85rem;
    padding: 12px;
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    box-shadow: 3px 3px 0px var(--border-color);
    cursor: pointer;
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease, border-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.apply-btn:hover {
    background-color: var(--text-primary);
    color: var(--bg-primary);
    border-color: var(--text-primary);
    box-shadow: 3px 3px 0px var(--text-primary);
}

.apply-btn:active {
    background-color: var(--text-secondary);
    border-color: var(--text-secondary);
}

/* ==========================================================================
   FAQS SECTION
   ========================================================================== */
.faqs-section {
    padding: clamp(60px, 8vw, 80px) 24px clamp(80px, 10vw, 120px) 24px;
    max-width: 850px;
    margin: 0 auto;
    border-top: 1px solid var(--border-color);
}

.faqs-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    width: 100%;
}

.faq-item {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    box-shadow: 3px 3px 0px var(--border-color);
    transition: border-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.faq-trigger {
    width: 100%;
    padding: clamp(16px, 3vw, 24px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
    color: var(--text-primary);
}

.faq-question {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.faq-icon {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-secondary);
    transition: transform var(--transition-speed) var(--transition-fn), color var(--transition-speed) ease;
}

.faq-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-speed) var(--transition-fn);
}

.faq-answer-inner {
    padding: 0 clamp(16px, 3vw, 24px) clamp(16px, 3vw, 24px) clamp(16px, 3vw, 24px);
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.65;
}

/* FAQ Active state managed via JS */
.faq-item.active {
    box-shadow: 3px 3px 0px var(--text-primary);
    border-color: var(--border-hover);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
    color: var(--text-primary);
}

/* ==========================================================================
   FOOTER & CONTACT INFO (TWO COLUMN GRID)
   ========================================================================== */
.footer {
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    padding: clamp(48px, 6vw, 64px) 24px;
    transition: border-color var(--transition-speed) ease;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 40px;
}

.footer-left {
    display: flex;
    flex-direction: column;
    gap: 24px;
    align-items: flex-start;
    flex: 1;
    min-width: 280px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 16px;
}

.footer-logo {
    height: 44px;
    width: auto;
    filter: grayscale(1) invert(1);
}

.footer-logo-text {
    display: flex;
    flex-direction: column;
}

.brand-main {
    font-family: var(--font-serif);
    font-weight: 500;
    font-size: 1.25rem;
    letter-spacing: -0.01em;
}

.brand-sub {
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 0.02em;
    margin-top: 2px;
}

/* Location details on the left side */
.footer-location {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    text-align: left;
}

.contact-icon {
    width: 16px;
    height: 16px;
    color: var(--text-primary);
    margin-top: 4px;
    flex-shrink: 0;
}

.contact-text-wrap {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.contact-line {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.contact-line-sub {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Right side content stacks vertically */
.footer-right {
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: flex-end;
    text-align: right;
    flex: 1;
    min-width: 280px;
}

.copyright-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.contact-row {
    display: flex;
    gap: 12px;
    align-items: center;
}

.contact-email {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--text-primary);
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition-speed) ease;
}

.contact-email:hover {
    border-color: var(--text-primary);
}

/* Replace blocky @ font with standard body font */
.email-at {
    font-family: var(--font-body);
    font-weight: 500;
}

/* Footer Social Links */
.footer-socials {
    display: flex;
    gap: 20px;
    justify-content: flex-end;
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-secondary);
    transition: color var(--transition-speed) ease;
}

.social-link:hover {
    color: var(--text-primary);
}

.social-icon {
    width: 16px;
    height: 16px;
}

/* ==========================================================================
   RESPONSIVE MEDIA QUERIES
   ========================================================================== */

/* Tablet & iPad Viewports */
@media (max-width: 1024px) {
    .hero-title {
        white-space: normal;
        word-break: keep-all;
    }
}

@media (max-width: 900px) {
    html {
        font-size: 15px;
    }
    
    .hero-section {
        padding: 120px 24px 80px 24px;
    }
    
    .footer-container {
        flex-direction: column;
        text-align: center;
        align-items: center;
        gap: 32px;
    }
    
    .footer-left {
        align-items: center;
        text-align: center;
    }

    .footer-brand {
        flex-direction: column;
        gap: 12px;
    }

    .footer-location {
        justify-content: center;
        text-align: center;
    }

    .footer-location .contact-text-wrap {
        align-items: center;
    }

    .footer-right {
        align-items: center;
        text-align: center;
    }

    .contact-row {
        justify-content: center;
    }

    .footer-socials {
        justify-content: center;
    }
}

/* Mobile Screens */
@media (max-width: 600px) {
    .header-container {
        padding: 16px 20px;
        flex-direction: column;
        gap: 16px;
        align-items: center;
        text-align: center;
    }
    
    .nav-links {
        display: flex;
        gap: 28px;
        justify-content: center;
        width: 100%;
    }

    .nav-item {
        font-size: 0.85rem;
    }
    
    .hero-section {
        padding: 100px 16px 60px 16px;
    }
    
    .hero-title {
        font-size: clamp(1.8rem, 7vw, 2.6rem);
        line-height: 1.2;
    }
    
    .hero-subtitle {
        font-size: 1.05rem;
        margin-bottom: 36px;
    }
    
    .cta-button {
        width: 100%;
        text-align: center;
    }
    
    .clusters-section {
        padding: 60px 16px;
    }
    
    .section-title {
        font-size: 2.2rem;
    }
    
    .clusters-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .cluster-card {
        padding: 24px;
    }
    
    .faqs-section {
        padding: 60px 16px 80px 16px;
    }
    
    .faq-trigger {
        padding: 20px 16px;
    }
    
    .faq-question {
        font-size: 0.95rem;
    }
}