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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: #1a1a2e;
    line-height: 1.6;
    background: #fff;
    -webkit-font-smoothing: antialiased;
}

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

/* === Container === */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* === Header === */
.header {
    padding: 16px 0;
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 100;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: #4361ee;
}

.header-cta {
    font-size: 0.875rem;
    font-weight: 600;
    color: #4361ee;
    padding: 8px 20px;
    border: 2px solid #4361ee;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.header-cta:hover {
    background: #4361ee;
    color: #fff;
}

/* === Buttons === */
.btn {
    display: inline-block;
    font-family: inherit;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.25s ease;
    text-align: center;
}

.btn-primary {
    background: #4361ee;
    color: #fff;
}

.btn-primary:hover {
    background: #3a56d4;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(67, 97, 238, 0.35);
}

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

.btn-lg {
    padding: 16px 40px;
    font-size: 1.1rem;
}

.btn-full {
    width: 100%;
}

/* === Hero === */
.hero {
    padding: 80px 0 60px;
    background: linear-gradient(135deg, #4361ee 0%, #7b2ff7 50%, #4361ee 100%);
    color: #fff;
    text-align: center;
}

.hero-title {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-description {
    font-size: 1.1rem;
    opacity: 0.9;
    max-width: 550px;
    margin: 0 auto 36px;
    line-height: 1.7;
}

.hero .btn-primary {
    background: #fff;
    color: #4361ee;
    font-weight: 700;
}

.hero .btn-primary:hover {
    background: #f0f0ff;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

/* === Problems Section === */
.problems {
    padding: 60px 0;
}

.section-title {
    text-align: center;
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: 40px;
    color: #1a1a2e;
}

.cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    margin-bottom: 60px;
}

.card {
    background: #f8f9ff;
    border-radius: 16px;
    padding: 32px 24px;
    text-align: center;
    border: 1px solid rgba(67, 97, 238, 0.08);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(67, 97, 238, 0.1);
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.card-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.card-text {
    font-size: 0.95rem;
    color: #555;
    line-height: 1.6;
}

/* === Solution === */
.solution {
    text-align: center;
    max-width: 650px;
    margin: 0 auto;
    padding: 40px 24px;
    background: linear-gradient(135deg, #4361ee, #7b2ff7);
    border-radius: 20px;
    color: #fff;
}

.solution .section-title {
    color: #fff;
}

.solution-text {
    font-size: 1.05rem;
    opacity: 0.95;
    line-height: 1.7;
}

/* === Signup === */
.signup {
    padding: 60px 0;
    background: #f8f9ff;
}

.signup-subtitle {
    text-align: center;
    font-size: 1.05rem;
    color: #555;
    margin-top: -24px;
    margin-bottom: 36px;
}

.google-form-wrapper {
    position: relative;
    max-width: 640px;
    margin: 0 auto;
    overflow: hidden;
}

.google-form-wrapper iframe {
    display: block;
    width: 100%;
    max-width: 640px;
    border: none;
}

.signup-form {
    max-width: 440px;
    margin: 0 auto;
    background: #fff;
    padding: 32px 28px;
    border-radius: 20px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

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

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: #1a1a2e;
}

.optional {
    color: #999;
    font-weight: 400;
}

.required {
    color: #e63946;
}

.form-group input {
    width: 100%;
    padding: 14px 16px;
    font-family: inherit;
    font-size: 1rem;
    border: 2px solid #e8e8f0;
    border-radius: 10px;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    background: #fafafe;
}

.form-group input:focus {
    border-color: #4361ee;
    box-shadow: 0 0 0 4px rgba(67, 97, 238, 0.1);
    background: #fff;
}

.form-group input::placeholder {
    color: #bbb;
}

/* === Footer === */
.footer {
    padding: 40px 0;
    text-align: center;
    color: #777;
    font-size: 0.875rem;
}

.footer-contact {
    margin-bottom: 8px;
}

.footer-contact a {
    color: #4361ee;
    font-weight: 500;
}

.footer-contact a:hover {
    text-decoration: underline;
}

.footer-disclaimer {
    margin-bottom: 8px;
    font-style: italic;
    color: #999;
}

.footer-copy {
    color: #bbb;
}

/* === Desktop (768px+) === */
@media (min-width: 768px) {
    .hero {
        padding: 120px 0 100px;
    }

    .hero-title {
        font-size: 3rem;
    }

    .hero-description {
        font-size: 1.2rem;
    }

    .problems {
        padding: 80px 0;
    }

    .section-title {
        font-size: 2rem;
    }

    .cards {
        grid-template-columns: repeat(3, 1fr);
        gap: 28px;
    }

    .signup {
        padding: 80px 0;
    }

    .signup-form {
        padding: 40px 36px;
    }
}

/* === Large screens === */
@media (min-width: 1024px) {
    .container {
        padding: 0 40px;
    }

    .hero-title {
        font-size: 3.4rem;
    }
}