:root {
    --primary: #009688;
    --primary-dark: #00796B;
    --background: #B2DFDB;
    --surface: #ffffff;
    --text: #29251F;
    --muted: #746e65;
    --border: #eee3d2;
    --danger: #c62828;
    --danger-light: #fff0f0;
    --success: #2e7d32;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family:
        Inter,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        Roboto,
        Arial,
        sans-serif;

    background:
        radial-gradient(
            circle at top right,
            rgba(253, 163, 1, 0.16),
            transparent 30%
        ),
        var(--background);

    color: var(--text);
    min-height: 100vh;
}

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

.header {
    width: 100%;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);

    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    max-width: 1100px;
    margin: auto;
    padding: 16px 24px;

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

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

    font-size: 24px;
    font-weight: 800;
}

.logo-icon {
    width: 42px;
    height: 42px;

    border-radius: 13px;

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

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

    font-weight: 900;
    font-size: 20px;

    box-shadow: 0 8px 20px rgba(253, 163, 1, 0.25);
}

.nav {
    display: flex;
    gap: 24px;

    color: var(--muted);
    font-size: 14px;
}

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

.container {
    max-width: 1100px;
    margin: auto;
    padding: 70px 24px;
}

.hero {
    text-align: center;
    max-width: 760px;
    margin: auto;
}

.badge {
    display: inline-flex;
    align-items: center;

    padding: 7px 14px;

    background: #fff1d6;
    color: #8b5800;

    border-radius: 100px;

    font-size: 13px;
    font-weight: 700;

    margin-bottom: 20px;
}

.hero h1 {
    font-size: clamp(36px, 7vw, 62px);
    line-height: 1.05;
    margin: 0 0 22px;
    letter-spacing: -2px;
}

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

.hero p {
    font-size: 18px;
    line-height: 1.7;
    color: var(--muted);
    margin: 0 auto;
    max-width: 650px;
}

.card {
    background: var(--surface);

    border: 1px solid var(--border);
    border-radius: 24px;

    padding: 32px;

    box-shadow:
        0 20px 60px rgba(41, 37, 31, 0.08);

    margin-top: 40px;
}

.card h2 {
    margin-top: 0;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;

    margin-top: 50px;
}

.feature {
    background: white;

    border: 1px solid var(--border);
    border-radius: 20px;

    padding: 26px;
}

.feature-icon {
    width: 48px;
    height: 48px;

    border-radius: 14px;

    background: #fff1d6;

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

    font-size: 22px;

    margin-bottom: 18px;
}

.feature h3 {
    margin: 0 0 8px;
}

.feature p {
    margin: 0;

    color: var(--muted);
    line-height: 1.6;
}

.button {
    width: 100%;

    border: 0;
    border-radius: 14px;

    padding: 15px 20px;

    font-size: 16px;
    font-weight: 700;

    cursor: pointer;

    transition:
        transform 0.15s ease,
        box-shadow 0.15s ease,
        opacity 0.15s ease;
}

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

.button:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

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

    box-shadow:
        0 10px 24px rgba(253, 163, 1, 0.25);
}

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

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

    border: 1px solid #ddd;

    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.google-icon {
    font-weight: 900;
}

.form-group {
    margin: 20px 0;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 700;

    margin-bottom: 8px;
}

.input {
    width: 100%;

    padding: 14px 16px;

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

    font-size: 16px;

    outline: none;
}

.input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(253, 163, 1, 0.15);
}

.user-card {
    display: none;

    align-items: center;
    gap: 14px;

    padding: 14px;

    border: 1px solid var(--border);
    border-radius: 16px;

    margin-bottom: 20px;
}

.user-card img {
    width: 48px;
    height: 48px;

    border-radius: 50%;
}

.user-info {
    flex: 1;
}

.user-name {
    font-weight: 700;
}

.user-email {
    color: var(--muted);
    font-size: 13px;

    word-break: break-word;
}

.warning {
    background: var(--danger-light);

    border: 1px solid #f3cccc;
    color: #7f1d1d;

    border-radius: 16px;

    padding: 18px;

    line-height: 1.6;

    margin: 20px 0;
}

.success {
    background: #edf7ee;

    border: 1px solid #c8e6c9;
    color: var(--success);

    border-radius: 16px;

    padding: 18px;

    line-height: 1.6;

    display: none;
}

.error {
    background: var(--danger-light);

    border: 1px solid #f3cccc;
    color: var(--danger);

    border-radius: 16px;

    padding: 18px;

    line-height: 1.6;

    display: none;
}

.checkbox-row {
    display: flex;
    gap: 10px;
    align-items: flex-start;

    margin: 20px 0;

    font-size: 14px;
    line-height: 1.5;
}

.checkbox-row input {
    margin-top: 4px;
}

.loading {
    display: none;

    text-align: center;
    padding: 15px;
}

.spinner {
    width: 24px;
    height: 24px;

    border: 3px solid #eee;
    border-top-color: var(--primary);

    border-radius: 50%;

    animation: spin 0.8s linear infinite;

    margin: auto;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.footer {
    border-top: 1px solid var(--border);

    margin-top: 50px;
    padding: 30px 24px;

    text-align: center;

    color: var(--muted);
    font-size: 14px;
}

.footer a {
    color: var(--text);
    font-weight: 600;
}

@media (max-width: 750px) {

    .nav {
        display: none;
    }

    .container {
        padding: 45px 18px;
    }

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

    .card {
        padding: 24px;
        border-radius: 20px;
    }

    .hero h1 {
        letter-spacing: -1px;
    }
}