:root {
    --color-bg: #f3f6f4;
    --color-bg-soft: #e8efea;
    --color-surface: #ffffff;
    --color-ink: #1a2420;
    --color-muted: #5c6b64;
    --color-accent: #0f6e56;
    --color-accent-soft: #d8ebe3;
    --color-border: rgba(26, 36, 32, 0.1);
    --color-header: rgba(243, 246, 244, 0.85);
    --color-footer: rgba(255, 255, 255, 0.55);
    --font-body: "Vazirmatn", sans-serif;
    --space: clamp(1rem, 3vw, 2rem);
    --radius: 12px;
    --shadow: 0 12px 40px rgba(26, 36, 32, 0.06);
    --header-h: 4.25rem;
    --max-w: 1100px;
}

[data-theme="dark"] {
    --color-bg: #121816;
    --color-bg-soft: #1a221e;
    --color-surface: #1c2621;
    --color-ink: #e8efea;
    --color-muted: #9aada3;
    --color-accent: #3dba91;
    --color-accent-soft: rgba(61, 186, 145, 0.16);
    --color-border: rgba(232, 239, 234, 0.12);
    --color-header: rgba(18, 24, 22, 0.88);
    --color-footer: rgba(28, 38, 33, 0.7);
    --shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: var(--font-body);
    color: var(--color-ink);
    background:
        radial-gradient(ellipse 80% 50% at 100% -10%, var(--color-accent-soft), transparent 55%),
        radial-gradient(ellipse 60% 40% at 0% 100%, var(--color-bg-soft), transparent 50%),
        var(--color-bg);
    line-height: 1.7;
    transition: background 0.25s ease, color 0.25s ease;
}

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

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

.container {
    width: min(100% - 2rem, var(--max-w));
    margin-inline: auto;
}

/* Header */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-h);
    backdrop-filter: blur(12px);
    background: var(--color-header);
}

.header-inner {
    position: relative;
    height: 100%;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 1rem;
}

.brand {
    justify-self: start;
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    z-index: 1;
}

.site-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.75rem;
}

.site-nav a {
    padding: 0.45rem 0.9rem;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-muted);
    white-space: nowrap;
    transition: color 0.2s ease, background 0.2s ease;
}

.site-nav a:hover,
.site-nav a.is-active {
    color: var(--color-accent);
    background: var(--color-accent-soft);
}

.header-actions {
    justify-self: end;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    z-index: 1;
}

.theme-toggle,
.header-social,
.nav-toggle {
    width: 2.5rem;
    height: 2.5rem;
    padding: 0;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-surface);
    color: var(--color-ink);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.theme-toggle:hover,
.header-social:hover,
.nav-toggle:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.theme-toggle .icon-moon {
    display: none;
}

[data-theme="dark"] .theme-toggle .icon-sun {
    display: none;
}

[data-theme="dark"] .theme-toggle .icon-moon {
    display: block;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
}

.nav-toggle span {
    display: block;
    width: 1.1rem;
    height: 2px;
    background: currentColor;
    border-radius: 1px;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] span:first-child {
    transform: translateY(3.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:last-child {
    transform: translateY(-3.5px) rotate(-45deg);
}

/* Main */
.site-main {
    flex: 1;
    padding-block: var(--space);
}

/* Footer */
.site-footer {
    margin-top: auto;
    border-top: 1px solid var(--color-border);
    background: var(--color-footer);
    padding-block: 1.5rem;
}

.footer-inner {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 1.5rem;
}

.footer-brand-block {
    justify-self: start;
    text-align: start;
}

.footer-brand {
    display: block;
    margin: 0;
    font-weight: 700;
    font-size: 1.05rem;
}

.footer-copy {
    margin: 0.2rem 0 0;
    color: var(--color-muted);
    font-size: 0.75rem;
}

.footer-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem 1.5rem;
}

.footer-nav a {
    font-size: 0.9rem;
    color: var(--color-muted);
    transition: color 0.2s ease;
}

.footer-nav a:hover {
    color: var(--color-accent);
}

.footer-socials {
    justify-self: end;
    display: flex;
    align-items: center;
    gap: 0.65rem;
}

.footer-socials a {
    width: 2.25rem;
    height: 2.25rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-muted);
    transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.footer-socials a:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
}

/* Newsletter */
.newsletter {
    padding-block: clamp(1.75rem, 4vh, 2.75rem);
}

.newsletter-inner {
    text-align: center;
    max-width: 32rem;
    margin-inline: auto;
}

.newsletter-inner h2 {
    margin: 0;
    font-size: clamp(1.5rem, 3vw, 1.9rem);
    letter-spacing: -0.02em;
}

.newsletter-inner > p {
    margin: 0.5rem 0 1.1rem;
    color: var(--color-muted);
    font-size: 1rem;
}

.newsletter-messages {
    list-style: none;
    margin: 0 0 1rem;
    padding: 0;
}

.newsletter-message {
    margin: 0;
    padding: 0.65rem 0.9rem;
    border-radius: 8px;
    font-size: 0.9rem;
}

.newsletter-message-success {
    background: var(--color-accent-soft);
    color: var(--color-accent);
}

.newsletter-message-info {
    background: var(--color-bg-soft);
    color: var(--color-muted);
}

.newsletter-message-error {
    background: rgba(180, 60, 60, 0.12);
    color: #b43c3c;
}

.newsletter-form {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}

.newsletter-form input[type="email"] {
    flex: 1 1 14rem;
    min-width: 0;
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    background: var(--color-surface);
    color: var(--color-ink);
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s ease;
}

.newsletter-form input[type="email"]::placeholder {
    color: var(--color-muted);
}

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

.newsletter-form .btn {
    flex: 0 0 auto;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.7rem 1.35rem;
    border-radius: 10px;
    font-size: 0.95rem;
    font-weight: 600;
    font-family: inherit;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.btn:hover {
    transform: translateY(-1px);
}

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

.btn-primary:hover {
    filter: brightness(1.08);
}

.btn-ghost {
    background: transparent;
    color: var(--color-ink);
    border-color: var(--color-border);
}

.btn-ghost:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background: var(--color-accent-soft);
}

.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;
}

/* Mobile nav */
@media (max-width: 860px) {
    .nav-toggle {
        display: flex;
    }

    .site-nav {
        position: absolute;
        top: var(--header-h);
        inset-inline: 0;
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 0.25rem;
        padding: 1rem;
        background: var(--color-surface);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow);
    }

    .site-nav.is-open {
        display: flex;
    }

    .site-nav a {
        padding: 0.75rem 1rem;
    }

    .header-inner {
        grid-template-columns: 1fr auto;
    }

    .site-nav {
        grid-column: 1 / -1;
    }

    .footer-inner {
        grid-template-columns: 1fr;
        justify-items: center;
        text-align: center;
        gap: 1.25rem;
    }

    .footer-brand-block,
    .footer-socials {
        justify-self: center;
        text-align: center;
    }
}