/* =========================================================
   EzBackend — Supabase-inspired Dark Emerald Theme
   Font: Inter, JetBrains Mono, 4/8dp spacing
   ========================================================= */

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

:root {
    --color-bg:            #0A0A0A;
    --color-surface:       #111111;
    --color-surface-hover: #1A1A1A;
    --color-border:        #1F2A1F;
    --color-border-light:  #2A3A2A;

    --color-accent:        #3ECF8E;
    --color-accent-hover:  #2FB87A;
    --color-accent-subtle: rgba(62, 207, 142, 0.1);

    --color-fg:            #EDEDED;
    --color-text-primary:  #E0E0E0;
    --color-text-secondary:#8A8F8A;
    --color-text-muted:    #5A5F5A;

    --color-code-bg:       #0D0D0D;
    --color-code-comment:  #4A6F5A;
    --color-code-prompt:   #3ECF8E;

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;

    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-14: 56px;
    --space-16: 64px;
    --space-20: 80px;
    --space-24: 96px;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
}

html {
    scroll-behavior: smooth;
}

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

::selection {
    background-color: var(--color-accent-subtle);
    color: var(--color-fg);
}

/* --- Container ------------------------------------------ */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* --- Nav ------------------------------------------------ */
.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(10, 10, 10, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-border);
}

.nav__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.nav__logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
    color: var(--color-fg);
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: -0.02em;
    line-height: 0;
}

.nav__logo:hover {
    opacity: 0.85;
}

.nav__logo-img {
    height: 26px;
    width: auto;
    display: block;
    border-radius: var(--radius-sm);
}

.nav__logo-text {
    display: none;
}

@media (min-width: 480px) {
    .nav__logo-text {
        display: inline;
    }
}

.nav__links {
    list-style: none;
    display: flex;
    align-items: center;
    gap: var(--space-6);
}

.nav__links a {
    text-decoration: none;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav__links a:hover {
    color: var(--color-fg);
}

.nav__gh {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: 6px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    font-size: 0.8125rem;
}

.nav__gh:hover {
    border-color: var(--color-text-secondary);
    background-color: var(--color-surface);
}

/* --- Hero ----------------------------------------------- */
.hero {
    padding: var(--space-24) 0 var(--space-20);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -30%;
    left: 50%;
    width: 700px;
    height: 700px;
    transform: translateX(-50%);
    background: radial-gradient(ellipse, rgba(62, 207, 142, 0.07) 0%, transparent 65%);
    pointer-events: none;
}

.hero__inner {
    position: relative;
}

.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: 6px 14px;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text-muted);
    margin-bottom: var(--space-8);
    background-color: var(--color-surface);
}

.hero__badge-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--color-accent);
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.hero__title {
    font-size: clamp(2.75rem, 6vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.04em;
    color: var(--color-fg);
    margin-bottom: var(--space-5);
}

.hero__accent {
    background: linear-gradient(135deg, var(--color-accent), #6EE7B7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__desc {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 480px;
    margin: 0 auto var(--space-10);
    line-height: 1.7;
}

.hero__actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
}

/* --- Buttons -------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    line-height: 1.4;
}

.btn--primary {
    background-color: var(--color-accent);
    color: #0A0A0A;
}

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

.btn--primary:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.btn--ghost {
    background-color: transparent;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
}

.btn--ghost:hover {
    color: var(--color-fg);
    border-color: var(--color-text-secondary);
    background-color: var(--color-surface);
}

.btn--ghost:focus-visible {
    outline: 2px solid var(--color-text-secondary);
    outline-offset: 2px;
}

/* --- Sections ------------------------------------------ */
.section {
    padding: var(--space-20) 0;
}

.section--dark {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.section--cta {
    text-align: center;
    padding: var(--space-20) 0;
}

.section__title {
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--color-fg);
    text-align: center;
    margin-bottom: var(--space-3);
}

.section__subtitle {
    font-size: 1rem;
    color: var(--color-text-secondary);
    text-align: center;
    max-width: 480px;
    margin: 0 auto var(--space-14);
}

/* --- Code Block ----------------------------------------- */
.code-block {
    position: relative;
    max-width: 580px;
    margin: 0 auto;
    background-color: var(--color-code-bg);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
}

.code-block pre {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.code-block code {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 2;
    color: var(--color-text-primary);
    white-space: pre;
}

.code-prompt {
    color: var(--color-code-prompt);
    font-weight: 500;
    margin-right: var(--space-2);
}

.code-comment {
    color: var(--color-code-comment);
    font-style: italic;
}

.code-block__copy {
    position: absolute;
    top: var(--space-3);
    right: var(--space-3);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: 1px solid transparent;
    color: var(--color-text-muted);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.code-block__copy:hover {
    background-color: var(--color-surface);
    border-color: var(--color-border-light);
    color: var(--color-fg);
}

.code-block__copy:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* --- Tutorials Grid ------------------------------------- */
.tutorials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
}

.tutorial-card {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    padding: var(--space-6);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    text-align: left;
    transition: all var(--transition-base);
    background-color: transparent;
}

.tutorial-card:hover {
    border-color: var(--color-border-light);
    background-color: var(--color-surface-hover);
    transform: translateY(-2px);
}

.tutorial-card__tag {
    display: inline-flex;
    align-self: flex-start;
    padding: 2px 10px;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-accent);
    background-color: var(--color-accent-subtle);
    letter-spacing: 0.01em;
}

.tutorial-card__title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-fg);
    line-height: 1.4;
}

.tutorial-card__desc {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.tutorial-card__meta {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: auto;
}

.tutorial-card__dot {
    color: var(--color-text-muted);
}

/* --- Topics Grid ---------------------------------------- */
.topics-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
}

.topic-card {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    padding: var(--space-8) var(--space-6);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    text-align: left;
    transition: all var(--transition-base);
    background-color: var(--color-surface);
}

.topic-card:hover {
    border-color: var(--color-border-light);
    background-color: var(--color-surface-hover);
    transform: translateY(-2px);
}

.topic-card__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background-color: var(--color-accent-subtle);
    color: var(--color-accent);
    flex-shrink: 0;
}

.topic-card__title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-fg);
}

.topic-card__desc {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* --- CTA ------------------------------------------------ */
.cta__inner {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.cta__title {
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--color-fg);
    margin-bottom: var(--space-3);
}

.cta__desc {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
}

/* --- Footer --------------------------------------------- */
.footer {
    padding: var(--space-10) 0;
    border-top: 1px solid var(--color-border);
}

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

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

.footer__link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer__link:hover {
    color: var(--color-text-secondary);
}

/* --- Responsive ----------------------------------------- */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-5);
    }

    .hero {
        padding: var(--space-16) 0 var(--space-14);
    }

    .hero__actions {
        flex-direction: column;
    }

    .hero__desc {
        font-size: 1rem;
    }

    .tutorials-grid,
    .topics-grid,
    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--space-3);
    }

    .section {
        padding: var(--space-14) 0;
    }

    .section__subtitle {
        margin-bottom: var(--space-10);
    }

    .footer__inner {
        flex-direction: column;
        gap: var(--space-3);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .nav__links li:not(:last-child) {
        display: none;
    }

    .nav__inner {
        height: 52px;
    }

    .code-block {
        padding: var(--space-4);
    }

    .code-block code {
        font-size: 0.75rem;
        line-height: 1.8;
    }
}