/* ============================================
   SpeakYourScience — Styles
   Bold & Energetic Design System
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
    --primary: #2563EB;
    --primary-dark: #1D4ED8;
    --accent: #F97316;
    --accent-dark: #EA580C;
    --secondary: #7C3AED;
    --secondary-dark: #6D28D9;
    --dark: #0F172A;
    --dark-muted: #334155;
    --light: #F8FAFC;
    --light-alt: #F1F5F9;
    --white: #FFFFFF;
    --border: #E2E8F0;
    --gradient-hero: linear-gradient(135deg, #0F172A 0%, #1E293B 30%, #1E1B4B 70%, #0F172A 100%);
    --gradient-blue-purple: linear-gradient(135deg, #2563EB, #7C3AED);
    --gradient-accent: linear-gradient(135deg, #F97316, #EF4444);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
}

/* ---------- Reset & Base ---------- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--dark);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--primary-dark);
}

ul {
    list-style: none;
}

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

.section {
    padding: 100px 0;
}

.section-label {
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--primary);
    margin-bottom: 12px;
}

.section-headline {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 900;
    color: var(--dark);
    margin-bottom: 20px;
    line-height: 1.15;
}

.section-intro {
    font-size: 1.125rem;
    color: var(--dark-muted);
    max-width: 720px;
    margin-bottom: 60px;
    line-height: 1.7;
}

/* ---------- Animations ---------- */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

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

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    border-radius: var(--radius-sm);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--accent);
    color: var(--white);
    border-color: var(--accent);
}

.btn-primary:hover {
    background: var(--accent-dark);
    border-color: var(--accent-dark);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(249, 115, 22, 0.35);
}

.btn-secondary {
    background: transparent;
    color: var(--white);
    border-color: rgba(255, 255, 255, 0.4);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.8);
    color: var(--white);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border-color: var(--primary);
    padding: 12px 24px;
    font-size: 0.9375rem;
}

.btn-outline:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.3);
}

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: all var(--transition);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 12px 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 900;
    text-decoration: none;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-mark {
    display: block;
    flex-shrink: 0;
}

.logo-speak {
    color: var(--white);
}

.logo-your {
    color: var(--accent);
}

.logo-science {
    color: var(--white);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9375rem;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    text-decoration: none;
}

.nav-link:hover {
    color: var(--white);
    background: rgba(255, 255, 255, 0.1);
}

.nav-cta {
    display: inline-flex;
    align-items: center;
    padding: 10px 24px;
    background: var(--accent);
    color: var(--white);
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    text-decoration: none;
    margin-left: 12px;
    transition: all var(--transition);
}

.nav-cta:hover {
    background: var(--accent-dark);
    color: var(--white);
    transform: translateY(-1px);
}

/* Hamburger */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--white);
    position: relative;
    transition: all var(--transition);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--white);
    left: 0;
    transition: all var(--transition);
}

.hamburger::before {
    top: -7px;
}

.hamburger::after {
    bottom: -7px;
}

.nav-toggle.active .hamburger {
    background: transparent;
}

.nav-toggle.active .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.nav-toggle.active .hamburger::after {
    bottom: 0;
    transform: rotate(-45deg);
}

/* ============================================
   HERO
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-hero);
    z-index: 0;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.3) 0%, transparent 70%);
    border-radius: 50%;
    animation: pulse-glow 8s ease-in-out infinite;
}

.hero-bg::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(124, 58, 237, 0.25) 0%, transparent 70%);
    border-radius: 50%;
    animation: pulse-glow 8s ease-in-out 4s infinite;
}

@keyframes pulse-glow {
    0%, 100% { transform: scale(1); opacity: 0.6; }
    50% { transform: scale(1.1); opacity: 1; }
}

.hero-content {
    position: relative;
    z-index: 1;
    padding-top: 120px;
    padding-bottom: 80px;
}

.hero-logo {
    margin-bottom: 32px;
    filter: drop-shadow(0 4px 20px rgba(37, 99, 235, 0.4));
}

.hero-headline {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 900;
    color: var(--white);
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
    max-width: 800px;
}

.highlight {
    background: var(--gradient-blue-purple);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.highlight-accent {
    color: var(--accent);
    -webkit-text-fill-color: var(--accent);
}

.hero-subheadline {
    font-size: clamp(1.125rem, 2vw, 1.375rem);
    color: rgba(255, 255, 255, 0.75);
    max-width: 600px;
    line-height: 1.6;
    margin-bottom: 40px;
}

.hero-ctas {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* ============================================
   THE PROBLEM
   ============================================ */
.problem {
    background: var(--light);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-bottom: 60px;
}

.stat-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition);
    border: 1px solid var(--border);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.stat-icon {
    color: var(--primary);
    margin-bottom: 20px;
}

.stat-number {
    font-size: clamp(3rem, 5vw, 4.5rem);
    font-weight: 900;
    color: var(--primary);
    line-height: 1;
    display: inline;
}

.stat-suffix {
    font-size: clamp(2rem, 3.5vw, 3rem);
    font-weight: 900;
    color: var(--primary);
    line-height: 1;
}

.stat-desc {
    font-size: 1rem;
    color: var(--dark-muted);
    margin-top: 12px;
    line-height: 1.5;
}

.stat-source {
    display: block;
    font-size: 0.8125rem;
    color: #94A3B8;
    margin-top: 12px;
    font-style: normal;
}

.problem-narrative {
    max-width: 800px;
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 40px;
    border-left: 4px solid var(--primary);
    box-shadow: var(--shadow-sm);
}

.problem-narrative p {
    color: var(--dark-muted);
    line-height: 1.8;
}

.problem-narrative p + p {
    margin-top: 16px;
}

/* ============================================
   OUR APPROACH
   ============================================ */
.approach {
    background: var(--white);
}

.pillars-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-bottom: 60px;
}

.pillar-card {
    background: var(--light);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    transition: all var(--transition);
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

.pillar-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-blue-purple);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
}

.pillar-card:hover::before {
    transform: scaleX(1);
}

.pillar-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    background: var(--white);
}

.pillar-icon {
    color: var(--primary);
    margin-bottom: 20px;
}

.pillar-title {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 12px;
}

.pillar-desc {
    color: var(--dark-muted);
    line-height: 1.7;
}

.approach-detail {
    background: var(--light);
    border-radius: var(--radius-lg);
    padding: 40px;
    border: 1px solid var(--border);
}

.approach-detail h4 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}

.approach-detail p {
    color: var(--dark-muted);
    line-height: 1.7;
    margin-bottom: 24px;
}

.institution-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tag {
    display: inline-flex;
    padding: 8px 16px;
    background: var(--white);
    color: var(--secondary);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 100px;
    border: 1px solid rgba(124, 58, 237, 0.2);
    transition: all var(--transition);
}

.tag:hover {
    background: var(--secondary);
    color: var(--white);
    border-color: var(--secondary);
}

/* ============================================
   FEATURED CREATORS
   ============================================ */
.creators {
    background: var(--dark);
    color: var(--white);
}

.creators .section-label {
    color: var(--accent);
}

.creators .section-headline {
    color: var(--white);
}

.creators .section-intro {
    color: rgba(255, 255, 255, 0.7);
}

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

.creator-card {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all var(--transition);
}

.creator-card:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-4px);
}

.creator-avatar {
    margin-bottom: 16px;
}

.avatar-placeholder {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--white);
}

.creator-platform {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 12px;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.8125rem;
    font-weight: 500;
}

.platform-icon {
    opacity: 0.6;
}

.creator-name {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 8px;
}

.creator-focus {
    font-size: 0.9375rem;
    color: rgba(255, 255, 255, 0.65);
    line-height: 1.6;
    margin-bottom: 16px;
}

.creator-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.topic {
    display: inline-flex;
    padding: 4px 12px;
    background: rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.8125rem;
    border-radius: 100px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.creator-link {
    display: inline-flex;
    align-items: center;
    color: var(--accent);
    font-size: 0.9375rem;
    font-weight: 600;
    transition: all var(--transition);
}

.creator-link:hover {
    color: var(--white);
    gap: 4px;
}

/* ============================================
   GET INVOLVED
   ============================================ */
.involved {
    background: var(--light);
}

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

.involved-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    border: 1px solid var(--border);
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
}

.involved-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.involved-icon {
    color: var(--primary);
    margin-bottom: 16px;
}

.involved-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}

.involved-pitch {
    font-size: 0.9375rem;
    color: var(--dark-muted);
    line-height: 1.7;
    margin-bottom: 24px;
    flex-grow: 1;
}

/* ============================================
   ABOUT
   ============================================ */
.about {
    background: var(--white);
}

.about-content {
    margin-bottom: 60px;
}

.about-text {
    max-width: 800px;
}

.about-text p {
    font-size: 1.0625rem;
    color: var(--dark-muted);
    line-height: 1.8;
}

.about-text p + p {
    margin-top: 16px;
}

.principles {
    margin-bottom: 40px;
}

.principles-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 24px;
}

.principles-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.principle {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--light);
    padding: 14px 24px;
    border-radius: 100px;
    border: 1px solid var(--border);
    transition: all var(--transition);
}

.principle:hover {
    border-color: var(--primary);
    background: rgba(37, 99, 235, 0.05);
}

.principle-icon {
    color: var(--primary);
    display: flex;
    align-items: center;
}

.principle span {
    font-weight: 600;
    font-size: 0.9375rem;
    color: var(--dark);
}

.acknowledgments {
    padding-top: 40px;
    border-top: 1px solid var(--border);
}

.acknowledgments p {
    font-size: 0.9375rem;
    color: var(--dark-muted);
    line-height: 1.7;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--dark);
    color: rgba(255, 255, 255, 0.7);
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
    font-size: 1.25rem;
    font-weight: 900;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
}

.footer-tagline {
    font-size: 0.9375rem;
    color: rgba(255, 255, 255, 0.5);
    max-width: 300px;
}

.footer-links h5,
.footer-contact h5 {
    color: var(--white);
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 16px;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9375rem;
    transition: color var(--transition);
}

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

.footer-contact a {
    color: var(--accent);
    font-size: 0.9375rem;
}

.footer-contact a:hover {
    color: var(--white);
}

.footer-social {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.6);
    transition: all var(--transition);
}

.social-link:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-2px);
}

.footer-bottom {
    padding-top: 24px;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8125rem;
    color: rgba(255, 255, 255, 0.4);
}

/* ============================================
   RESPONSIVE
   ============================================ */

/* Tablet */
@media (max-width: 968px) {
    .stats-grid,
    .pillars-grid,
    .creators-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .involved-grid .involved-card:last-child {
        grid-column: 1 / -1;
        max-width: 50%;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }

    .footer-brand {
        grid-column: 1 / -1;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 70px 0;
    }

    /* Mobile nav */
    .nav-toggle {
        display: block;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 360px;
        height: 100vh;
        background: rgba(15, 23, 42, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: flex-start;
        padding: 100px 32px 40px;
        transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: -10px 0 30px rgba(0, 0, 0, 0.3);
    }

    .nav-menu.open {
        right: 0;
    }

    .nav-links {
        flex-direction: column;
        width: 100%;
        gap: 0;
    }

    .nav-link {
        display: block;
        width: 100%;
        padding: 14px 0;
        font-size: 1.125rem;
        border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    .nav-cta {
        margin-left: 0;
        margin-top: 24px;
        width: 100%;
        text-align: center;
    }

    .stats-grid,
    .pillars-grid,
    .creators-grid,
    .involved-grid {
        grid-template-columns: 1fr;
    }

    .involved-grid .involved-card:last-child {
        max-width: 100%;
    }

    .hero-headline {
        font-size: clamp(2rem, 8vw, 3rem);
    }

    .hero-content {
        padding-top: 100px;
        padding-bottom: 60px;
    }

    .hero-ctas {
        flex-direction: column;
        align-items: flex-start;
    }

    .hero-ctas .btn {
        width: 100%;
        text-align: center;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-brand {
        grid-column: auto;
    }

    .principles-grid {
        gap: 10px;
    }

    .principle {
        padding: 10px 18px;
        font-size: 0.875rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .section {
        padding: 60px 0;
    }

    .stat-card,
    .pillar-card,
    .creator-card,
    .involved-card {
        padding: 28px 20px;
    }

    .problem-narrative,
    .approach-detail {
        padding: 28px 20px;
    }
}