/* =========================================
   GRIT. Landing Page
   Typography: Space Grotesk (display) + Inter (body)
   Palette: #0b0b0b base, #a3e635 accent, warm greys
   ========================================= */

:root {
    --bg: #0b0b0b;
    --bg-raised: #131313;
    --bg-subtle: #181818;
    --border: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.12);

    --accent: #a3e635;
    --accent-dim: rgba(163, 230, 53, 0.12);
    --accent-hover: #b5ef4d;

    --text: #e8e8e3;
    --text-secondary: #8a8a82;
    --text-muted: #555550;

    --diff-beginner: #34d399;
    --diff-intermediate: #60a5fa;
    --diff-advanced: #fb923c;
    --diff-elite: #c084fc;

    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    --container: 1120px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    font-size: 16px;
}

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

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

button {
    font-family: inherit;
    border: none;
    background: none;
    cursor: pointer;
    color: inherit;
}

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

/* =========================================
   Typography
   ========================================= */
h1 {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2.5rem, 5vw, 3.75rem);
    line-height: 1.08;
    letter-spacing: -0.025em;
    color: var(--text);
}

h2 {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.75rem, 3.5vw, 2.5rem);
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: var(--text);
}

h3 {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.25rem;
    line-height: 1.3;
    letter-spacing: -0.01em;
    color: var(--text);
}

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

/* Section labels */
.section-label {
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    margin-bottom: 12px;
}

.section-heading {
    margin-bottom: 48px;
}

/* =========================================
   Navigation
   ========================================= */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(11, 11, 11, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    transition: box-shadow 0.3s ease;
}

.navbar.scrolled {
    box-shadow: 0 1px 12px rgba(0, 0, 0, 0.4);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-mark {
    display: block;
    width: 28px;
    height: 28px;
    flex-shrink: 0;
}

.logo-wordmark {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: 0.06em;
}

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

.nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

.nav-links a:hover {
    color: var(--text);
}

.nav-cta {
    padding: 8px 18px;
    background: var(--accent);
    color: var(--bg) !important;
    border-radius: 6px;
    font-weight: 600 !important;
    transition: background 0.2s ease !important;
}

.nav-cta:hover {
    background: var(--accent-hover) !important;
}

/* Mobile menu toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    width: 32px;
    height: 32px;
}

.mobile-menu-toggle span {
    display: block;
    width: 20px;
    height: 1.5px;
    background: var(--text);
    transition: all 0.3s ease;
}

.mobile-menu-toggle.active span:first-child {
    transform: rotate(45deg) translate(3px, 3px);
}

.mobile-menu-toggle.active span:last-child {
    transform: rotate(-45deg) translate(3px, -3px);
}

/* =========================================
   Buttons
   ========================================= */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    background: var(--accent);
    color: var(--bg);
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: 8px;
    transition: background 0.2s ease, transform 0.15s ease;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-large {
    padding: 18px 36px;
    font-size: 1.0625rem;
}

/* =========================================
   Hero
   ========================================= */
.hero {
    padding: 140px 0 48px;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 0.85fr;
    gap: 64px;
    align-items: center;
}

.hero-logo-mark {
    display: block;
    width: 48px;
    height: 48px;
    margin-bottom: 24px;
    opacity: 0.9;
}

.hero-eyebrow {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 20px;
}

.hero h1 {
    margin-bottom: 24px;
}

.hero-sub {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 480px;
    margin-bottom: 32px;
}

.hero .waitlist-inline {
    max-width: 480px;
}

/* Device mockup */
.hero-device {
    display: flex;
    justify-content: flex-end;
}

.device-frame {
    width: 300px;
    border-radius: 32px;
    overflow: hidden;
    border: 2px solid rgba(163, 230, 53, 0.1);
    box-shadow:
        0 24px 48px rgba(0, 0, 0, 0.4),
        0 0 60px rgba(163, 230, 53, 0.06),
        0 0 0 1px rgba(255, 255, 255, 0.03);
    animation: device-float 6s ease-in-out infinite;
    transition: box-shadow 0.4s ease;
}

.device-frame:hover {
    box-shadow:
        0 32px 64px rgba(0, 0, 0, 0.5),
        0 0 80px rgba(163, 230, 53, 0.1),
        0 0 0 1px rgba(163, 230, 53, 0.12);
}

@keyframes device-float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.device-screen {
    width: 100%;
    height: auto;
}

/* =========================================
   Proof Strip
   ========================================= */
.proof-strip {
    padding: 40px 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.proof-items {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 48px;
}

.proof-item {
    display: flex;
    align-items: baseline;
    gap: 10px;
}

.proof-number {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text);
}

.proof-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.proof-divider {
    width: 1px;
    height: 28px;
    background: var(--border-hover);
}

/* =========================================
   How It Works
   ========================================= */
.how-it-works {
    padding: 96px 0;
}

.hiw-block {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
    padding: 56px 0;
    border-bottom: 1px solid var(--border);
}

.hiw-block:first-of-type {
    padding-top: 0;
}

.hiw-block:last-of-type {
    border-bottom: none;
    padding-bottom: 0;
}

.hiw-block-reverse .hiw-text {
    order: 2;
}

.hiw-block-reverse .hiw-card {
    order: 1;
}

.step-number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-muted);
    line-height: 1;
    margin-bottom: 16px;
}

.hiw-text h3 {
    margin-bottom: 12px;
}

.hiw-text p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.65;
    margin-bottom: 20px;
}

.hiw-meta {
    font-size: 0.8125rem;
    color: var(--text-muted);
    letter-spacing: 0.01em;
}

/* =========================================
   Mockup Cards (CSS-driven UI illustrations)
   ========================================= */
.mock-card {
    background: var(--bg-raised);
    border: 1px solid var(--border-hover);
    border-radius: 12px;
    padding: 24px;
    box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.3),
        0 0 0 1px rgba(255, 255, 255, 0.03);
}

.mock-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.mock-card-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.9375rem;
    color: var(--text);
}

.mock-badge {
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--accent);
    background: var(--accent-dim);
    padding: 4px 10px;
    border-radius: 100px;
}

.mock-badge-streak {
    color: var(--diff-beginner);
    background: rgba(52, 211, 153, 0.12);
}

/* Challenge picker mockup */
.mock-challenge-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 14px;
    border-radius: 8px;
    margin-bottom: 6px;
    border: 1px solid transparent;
    transition: background 0.15s ease;
}

.mock-challenge-item:last-child {
    margin-bottom: 0;
}

.mock-challenge-selected {
    background: var(--accent-dim);
    border-color: rgba(163, 230, 53, 0.15);
}

.mock-challenge-left {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.mock-challenge-name {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text);
}

.mock-challenge-info {
    font-size: 0.6875rem;
    color: var(--text-muted);
}

.mock-difficulty {
    font-size: 0.625rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 3px 8px;
    border-radius: 4px;
}

.mock-elite {
    background: rgba(192, 132, 252, 0.12);
    color: var(--diff-elite);
}

.mock-beginner {
    background: rgba(52, 211, 153, 0.12);
    color: var(--diff-beginner);
}

.mock-intermediate {
    background: rgba(96, 165, 250, 0.12);
    color: var(--diff-intermediate);
}

/* Task checklist mockup */
.mock-task {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
}

.mock-task:last-child {
    border-bottom: none;
}

.mock-check {
    width: 22px;
    height: 22px;
    border-radius: 6px;
    border: 1.5px solid var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.mock-check.checked {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--bg);
}

.mock-task-info {
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.mock-task-name {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text);
}

.mock-task-detail {
    font-size: 0.6875rem;
    color: var(--text-muted);
}

.mock-task-auto {
    color: var(--diff-intermediate);
}

/* Badge completion mockup */
.mock-card-badge {
    text-align: center;
}

.mock-badge-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 24px 0 20px;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border);
}

.mock-badge-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--accent-dim);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 4px;
}

.mock-badge-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1rem;
    color: var(--text);
}

.mock-badge-subtitle {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
}

.mock-badge-stats {
    display: flex;
    justify-content: space-around;
}

.mock-badge-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.mock-stat-value {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--text);
}

.mock-stat-label {
    font-size: 0.6875rem;
    color: var(--text-muted);
}

/* =========================================
   Features (asymmetric layout)
   ========================================= */
.features {
    padding: 96px 0;
    background: var(--bg-raised);
}

.feature-row {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 24px;
    margin-bottom: 24px;
}

.feature-row:last-child {
    margin-bottom: 0;
}

.feature-row-reverse {
    grid-template-columns: 1fr 1.5fr;
}

.feature-block {
    padding: 40px 36px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    transition: border-color 0.3s ease;
}

.feature-block:hover {
    border-color: var(--border-hover);
}

.feature-tag {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    margin-bottom: 16px;
}

.feature-block h3 {
    margin-bottom: 12px;
}

.feature-block p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.65;
}

/* =========================================
   Challenges
   ========================================= */
.challenges {
    padding: 96px 0;
}

.difficulty-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.difficulty-tab {
    padding: 8px 20px;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    transition: all 0.2s ease;
}

.difficulty-tab:hover {
    color: var(--text);
    border-color: var(--border-hover);
}

.difficulty-tab.active {
    background: var(--accent);
    color: var(--bg);
    border-color: var(--accent);
}

.challenges-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.challenge-card {
    padding: 28px;
    background: var(--bg-raised);
    border: 1px solid var(--border);
    border-radius: 10px;
    transition: border-color 0.2s ease, transform 0.2s ease;
    display: flex;
    flex-direction: column;
}

.challenge-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.challenge-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
}

.challenge-difficulty {
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 3px 10px;
    border-radius: 4px;
}

.challenge-difficulty.beginner {
    background: rgba(52, 211, 153, 0.12);
    color: var(--diff-beginner);
}

.challenge-difficulty.intermediate {
    background: rgba(96, 165, 250, 0.12);
    color: var(--diff-intermediate);
}

.challenge-difficulty.advanced {
    background: rgba(251, 146, 60, 0.12);
    color: var(--diff-advanced);
}

.challenge-difficulty.elite {
    background: rgba(192, 132, 252, 0.12);
    color: var(--diff-elite);
}

.challenge-duration {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.challenge-card h3 {
    font-size: 1.125rem;
    margin-bottom: 8px;
}

.challenge-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.55;
    margin-bottom: 16px;
    flex-grow: 1;
}

.challenge-task-count {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.challenges-note {
    margin-top: 32px;
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* =========================================
   Task Types
   ========================================= */
.task-types {
    padding: 80px 0;
    background: var(--bg-raised);
}

.task-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.task-pill {
    padding: 10px 20px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 100px;
    transition: border-color 0.2s ease, color 0.2s ease;
}

.task-pill:hover {
    border-color: var(--accent);
    color: var(--text);
}

/* =========================================
   Waitlist / CTA
   ========================================= */
.waitlist {
    padding: 120px 0;
}

.waitlist-content {
    max-width: 540px;
}

.waitlist-content h2 {
    margin-bottom: 16px;
}

.waitlist-content p {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 32px;
}

/* Shared waitlist form styles */
.waitlist-inline,
.waitlist-form {
    width: 100%;
}

.waitlist-field {
    display: flex;
    gap: 8px;
}

.waitlist-field input[type="email"] {
    flex: 1;
    padding: 14px 18px;
    font-family: var(--font-body);
    font-size: 0.9375rem;
    color: var(--text);
    background: var(--bg-raised);
    border: 1px solid var(--border-hover);
    border-radius: 8px;
    outline: none;
    transition: border-color 0.2s ease;
    min-width: 0;
}

.waitlist-field input[type="email"]::placeholder {
    color: var(--text-muted);
}

.waitlist-field input[type="email"]:focus {
    border-color: var(--accent);
}

.waitlist-field-large input[type="email"] {
    padding: 18px 22px;
    font-size: 1rem;
}

.waitlist-note,
.hero-note {
    display: block;
    margin-top: 12px;
    font-size: 0.8125rem;
    color: var(--text-muted);
}

/* =========================================
   Footer
   ========================================= */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-left {
    display: flex;
    align-items: center;
    gap: 24px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-display);
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: 0.06em;
}

.footer-logo-mark {
    display: block;
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.footer-copy {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.footer-right {
    display: flex;
    gap: 28px;
}

.footer-right a {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

.footer-right a:hover {
    color: var(--text);
}

/* =========================================
   Scroll Animations
   ========================================= */
.fade-in {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

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

/* =========================================
   Mobile menu (injected via JS, styled here)
   ========================================= */
.nav-links.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(11, 11, 11, 0.97);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 20px 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
}

.nav-links.active .nav-cta {
    align-self: flex-start;
}

/* =========================================
   Responsive
   ========================================= */

/* Tablet */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .hero-device {
        justify-content: center;
        order: -1;
    }

    .device-frame {
        width: 260px;
    }

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

    .hero-sub {
        margin-left: auto;
        margin-right: auto;
    }

    .hero .waitlist-inline {
        margin-left: auto;
        margin-right: auto;
        max-width: 440px;
    }

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

    .hiw-block-reverse .hiw-text,
    .hiw-block-reverse .hiw-card {
        order: unset;
    }

    .hiw-card {
        max-width: 440px;
    }

    .feature-row,
    .feature-row-reverse {
        grid-template-columns: 1fr;
    }

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

/* Mobile */
@media (max-width: 768px) {
    .nav-links:not(.active) {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .hero {
        padding: 120px 0 40px;
    }

    .device-frame {
        width: 220px;
    }

    .proof-items {
        flex-direction: column;
        gap: 20px;
    }

    .proof-divider {
        width: 40px;
        height: 1px;
    }

    .proof-item {
        flex-direction: column;
        align-items: center;
        gap: 4px;
        text-align: center;
    }

    .how-it-works,
    .features,
    .challenges,
    .waitlist {
        padding: 64px 0;
    }

    .waitlist-field,
    .waitlist-field-large {
        flex-direction: column;
    }

    .waitlist-field input[type="email"],
    .waitlist-field-large input[type="email"] {
        width: 100%;
    }

    .task-types {
        padding: 56px 0;
    }

    .section-heading {
        margin-bottom: 32px;
    }

    .hiw-block {
        padding: 40px 0;
        gap: 24px;
    }

    .step-number {
        font-size: 1.75rem;
        margin-bottom: 12px;
    }

    .hero .waitlist-field {
        flex-direction: column;
    }

    .challenges-grid {
        grid-template-columns: 1fr;
    }

    .difficulty-tabs {
        gap: 6px;
    }

    .difficulty-tab {
        padding: 6px 14px;
        font-size: 0.75rem;
    }

    .footer-content {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }

    .footer-left {
        flex-direction: column;
        gap: 8px;
    }
}

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

    h1 {
        font-size: 2rem;
    }

    .feature-block {
        padding: 28px 24px;
    }

    .challenge-card {
        padding: 22px;
    }

    .waitlist {
        padding: 56px 0;
    }
}