:root {
    --bg: #F6F3EA;
    --surface: #FFFFFF;
    --surface-soft: #EEF3ED;

    --primary: #3F765B;
    --primary-dark: #28513D;
    --primary-light: #DDEADF;

    --text: #26352D;
    --text-soft: #66736B;

    --border: #DDE3DD;

    --navy: #17233A;

    --shadow:
        0 20px 60px rgba(40, 81, 61, 0.10);

    --radius-lg: 28px;
    --radius-md: 18px;
    --radius-sm: 12px;

    --transition:
        0.25s ease;
}


/* ================= DARK MODE ================= */

[data-theme="dark"] {

    --bg: #101A18;
    --surface: #172622;
    --surface-soft: #1E302A;

    --primary: #6FAF8C;
    --primary-dark: #A9D5BB;
    --primary-light: #29483B;

    --text: #EEF5F0;
    --text-soft: #AABAB1;

    --border: #2A3A35;

    --navy: #17233A;

    --shadow:
        0 20px 60px rgba(0, 0, 0, 0.30);
}


/* ================= BASE ================= */

html {
    scroll-behavior: smooth;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: Yekan, Tahoma, sans-serif;

    transition:
        background-color var(--transition),
        color var(--transition);
}

.container {
    width: min(1180px, calc(100% - 40px));
    margin: 0 auto;
}

.section {
    padding: 110px 0;
}


/* ================= HEADER ================= */

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;

    background:
        color-mix(
            in srgb,
            var(--bg) 88%,
            transparent
        );

    backdrop-filter: blur(18px);

    border-bottom:
        1px solid var(--border);
}

.header-inner {
    min-height: 82px;

    display: flex;
    align-items: center;
    justify-content: space-between;

    gap: 30px;
}

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

.brand-mark {
    width: 45px;
    height: 45px;

    display: grid;
    place-items: center;

    border-radius: 14px;

    background: var(--primary);
    color: white;

    font-size: 22px;
    font-weight: 900;

    box-shadow:
        0 8px 25px
        rgba(63, 118, 91, 0.22);
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-text strong {
    font-size: 19px;
    font-weight: 900;
}

.brand-text span {
    color: var(--text-soft);
    font-size: 11px;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 28px;
}

.main-nav > a {
    color: var(--text-soft);
    font-size: 14px;

    transition: color var(--transition);
}

.main-nav > a:hover {
    color: var(--primary);
}

.nav-login {
    padding: 11px 18px;

    border: 1px solid var(--border);
    border-radius: 12px;

    color: var(--primary) !important;
}

.theme-toggle {
    width: 42px;
    height: 42px;

    display: grid;
    place-items: center;

    border: 1px solid var(--border);
    border-radius: 12px;

    background: var(--surface);
    color: var(--text);

    font-size: 18px;

    transition:
        transform var(--transition),
        background-color var(--transition);
}

.theme-toggle:hover {
    transform: translateY(-2px);
}

.mobile-menu-button {
    display: none;

    width: 42px;
    height: 42px;

    border: 1px solid var(--border);
    border-radius: 12px;

    color: var(--text);
}


/* ================= MOBILE MENU ================= */

.mobile-menu {
    display: none;
    padding: 15px 20px 20px;

    border-top:
        1px solid var(--border);
}

.mobile-menu.open {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.mobile-menu a {
    padding: 13px;

    border-radius: 12px;

    color: var(--text);
    background: var(--surface);
}


/* ================= HERO ================= */

.hero {
    padding:
        100px 0 120px;

    overflow: hidden;
}

.hero-grid {
    display: grid;

    grid-template-columns:
        1.05fr
        0.95fr;

    align-items: center;

    gap: 80px;
}

.eyebrow {
    display: inline-flex;

    padding:
        7px 13px;

    border-radius: 50px;

    background:
        var(--primary-light);

    color:
        var(--primary-dark);

    font-size: 12px;
    font-weight: 700;
}

.hero h1 {
    margin-top: 22px;

    font-size:
        clamp(42px, 5vw, 70px);

    line-height: 1.2;

    font-weight: 900;

    letter-spacing: -1.5px;
}

.hero h1 span {
    color: var(--primary);
}

.hero-description {
    max-width: 650px;

    margin-top: 25px;

    color: var(--text-soft);

    font-size: 17px;
    line-height: 2.1;
}

.hero-actions {
    display: flex;

    flex-wrap: wrap;

    gap: 13px;

    margin-top: 32px;
}


/* ================= BUTTON ================= */

.button {
    min-height: 52px;

    display: inline-flex;
    align-items: center;
    justify-content: center;

    gap: 10px;

    padding:
        0 22px;

    border-radius: 14px;

    font-size: 14px;
    font-weight: 700;

    transition:
        transform var(--transition),
        box-shadow var(--transition);
}

.button:hover {
    transform: translateY(-3px);
}

.button-primary {
    background: var(--primary);
    color: white;

    box-shadow:
        0 12px 30px
        rgba(63, 118, 91, 0.20);
}

.button-secondary {
    background: var(--surface);
    color: var(--text);

    border:
        1px solid var(--border);
}

.button-light {
    background: #FFFFFF;
    color: #28513D;
}


/* ================= TRUST ================= */

.hero-trust {
    display: flex;

    flex-wrap: wrap;

    gap: 20px;

    margin-top: 28px;
}

.trust-item {
    display: flex;
    align-items: center;

    gap: 7px;

    color: var(--text-soft);

    font-size: 12px;
}

.trust-icon {
    width: 20px;
    height: 20px;

    display: grid;
    place-items: center;

    border-radius: 50%;

    background:
        var(--primary-light);

    color:
        var(--primary);

    font-size: 11px;
    font-weight: 900;
}


/* ================= AI CARD ================= */

.hero-visual {
    position: relative;
}

.ai-glow {
    position: absolute;

    width: 330px;
    height: 330px;

    top: 50%;
    left: 50%;

    transform:
        translate(-50%, -50%);

    background:
        radial-gradient(
            circle,
            rgba(111, 175, 140, 0.25),
            transparent 70%
        );

    filter: blur(10px);
}

.ai-card {
    position: relative;

    background:
        var(--surface);

    border:
        1px solid var(--border);

    border-radius:
        30px;

    padding: 20px;

    box-shadow:
        var(--shadow);
}

.ai-card-header {
    display: flex;
    align-items: center;

    gap: 12px;

    padding-bottom: 18px;

    border-bottom:
        1px solid var(--border);
}

.ai-avatar {
    width: 45px;
    height: 45px;

    display: grid;
    place-items: center;

    border-radius: 15px;

    background:
        var(--primary);

    color: white;

    font-weight: 900;
}

.ai-card-header > div:nth-child(2) {
    display: flex;
    flex-direction: column;
}

.ai-card-header strong {
    font-size: 14px;
}

.ai-card-header span {
    color: var(--text-soft);
    font-size: 11px;
}

.online-dot {
    width: 9px;
    height: 9px;

    margin-right: auto;

    border-radius: 50%;

    background: #65A77C;
}


/* ================= CHAT PREVIEW ================= */

.chat-preview {
    display: flex;
    flex-direction: column;

    gap: 14px;

    padding: 22px 5px;
}

.message {
    max-width: 82%;

    padding: 13px 15px;

    border-radius: 16px;

    font-size: 12px;
    line-height: 1.9;
}

.message-ai {
    align-self: flex-start;

    background:
        var(--surface-soft);

    border-bottom-right-radius:
        5px;
}

.message-user {
    align-self: flex-end;

    background:
        var(--primary);

    color: white;

    border-bottom-left-radius:
        5px;
}

.chat-preview-input {
    display: flex;
    align-items: center;

    gap: 10px;

    padding: 10px 12px;

    border:
        1px solid var(--border);

    border-radius: 15px;

    color: var(--text-soft);

    font-size: 11px;
}

.chat-preview-input button {
    width: 35px;
    height: 35px;

    margin-right: auto;

    display: grid;
    place-items: center;

    border-radius: 10px;

    background: var(--primary);
    color: white;
}


/* ================= SECTION HEADING ================= */

.section-heading {
    max-width: 680px;

    margin:
        0 auto 55px;

    text-align: center;
}

.section-heading h2 {
    margin-top: 15px;

    font-size:
        clamp(30px, 4vw, 46px);

    font-weight: 900;
}

.section-heading p {
    margin-top: 16px;

    color: var(--text-soft);

    line-height: 2;
}


/* ================= FEATURES ================= */

.about {
    background:
        var(--surface);
}

.feature-grid {
    display: grid;

    grid-template-columns:
        repeat(3, 1fr);

    gap: 20px;
}

.feature-card {
    padding: 30px;

    border:
        1px solid var(--border);

    border-radius:
        var(--radius-lg);

    background:
        var(--surface);

    transition:
        transform var(--transition),
        box-shadow var(--transition);
}

.feature-card:hover {
    transform: translateY(-7px);

    box-shadow:
        var(--shadow);
}

.feature-icon {
    width: 50px;
    height: 50px;

    display: grid;
    place-items: center;

    border-radius: 15px;

    background:
        var(--primary-light);

    color:
        var(--primary);

    font-size: 22px;
}

.feature-card h3 {
    margin-top: 22px;

    font-size: 18px;
    font-weight: 800;
}

.feature-card p {
    margin-top: 12px;

    color: var(--text-soft);

    line-height: 2;
    font-size: 13px;
}


/* ================= STEPS ================= */

.steps {
    max-width: 850px;

    margin: auto;

    display: grid;

    gap: 15px;
}

.step {
    display: flex;

    align-items: center;

    gap: 20px;

    padding: 25px;

    background:
        var(--surface);

    border:
        1px solid var(--border);

    border-radius:
        var(--radius-md);
}

.step-number {
    min-width: 48px;
    height: 48px;

    display: grid;
    place-items: center;

    border-radius: 14px;

    background:
        var(--primary);

    color: white;

    font-weight: 900;
}

.step h3 {
    font-size: 16px;
    font-weight: 800;
}

.step p {
    margin-top: 5px;

    color: var(--text-soft);

    font-size: 13px;
}


/* ================= CTA ================= */

.cta-section {
    padding: 80px 0;
}

.cta-box {
    display: flex;

    align-items: center;
    justify-content: space-between;

    gap: 30px;

    padding:
        55px;

    border-radius:
        30px;

    background:
        linear-gradient(
            135deg,
            var(--primary-dark),
            var(--primary)
        );

    color: white;

    box-shadow:
        0 25px 60px
        rgba(40, 81, 61, 0.20);
}

.cta-box .eyebrow {
    background:
        rgba(255,255,255,0.15);

    color: white;
}

.cta-box h2 {
    margin-top: 14px;

    font-size:
        clamp(27px, 4vw, 42px);

    font-weight: 900;
}

.cta-box p {
    margin-top: 10px;

    opacity: 0.8;
}


/* ================= FOOTER ================= */

.site-footer {
    padding-top: 70px;

    background:
        var(--surface);

    border-top:
        1px solid var(--border);
}

.footer-inner {
    display: grid;

    grid-template-columns:
        1fr auto;

    gap: 50px;
}

.footer-description {
    max-width: 450px;

    margin-top: 18px;

    color: var(--text-soft);

    font-size: 13px;

    line-height: 2;
}

.footer-links {
    display: flex;
    flex-direction: column;

    gap: 13px;
}

.footer-links a {
    color: var(--text-soft);

    font-size: 13px;
}

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

.copyright {
    display: flex;

    justify-content: space-between;

    gap: 20px;

    margin-top: 50px;

    padding:
        20px 0;

    border-top:
        1px solid var(--border);

    color: var(--text-soft);

    font-size: 11px;
}


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

@media (max-width: 900px) {

    .main-nav {
        display: none;
    }

    .mobile-menu-button {
        display: block;
    }

    .hero {
        padding-top: 70px;
    }

    .hero-grid {
        grid-template-columns: 1fr;

        gap: 60px;
    }

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

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

    .hero-actions,
    .hero-trust {
        justify-content: center;
    }

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

    .cta-box {
        flex-direction: column;
        align-items: flex-start;
    }
}


@media (max-width: 600px) {

    .container {
        width:
            min(
                100% - 28px,
                1180px
            );
    }

    .section {
        padding: 75px 0;
    }

    .hero {
        padding:
            60px 0 80px;
    }

    .hero h1 {
        font-size: 38px;
    }

    .hero-description {
        font-size: 14px;
    }

    .hero-actions {
        flex-direction: column;
    }

    .button {
        width: 100%;
    }

    .hero-trust {
        flex-direction: column;
        align-items: center;
    }

    .ai-card {
        padding: 14px;
    }

    .cta-box {
        padding: 30px 22px;
    }

    .copyright {
        flex-direction: column;
    }

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