/* ============================================
   filtresiz.net — buymeacoffee-inspired design
   White bg, black borders, yellow primary
   ============================================ */

:root {
    --yellow: #FFDD00;
    --yellow-light: #FFF3B0;
    --yellow-hover: #FFE533;
    --black: #000000;
    --white: #FFFFFF;
    --gray-50: #FAFAFA;
    --gray-100: #F5F5F5;
    --gray-200: #E5E5E5;
    --gray-500: #737373;
    --gray-700: #404040;
    --gray-900: #171717;
    --radius: 16px;
    --radius-sm: 10px;
    --border: 2.5px solid var(--black);
    --shadow: 4px 4px 0px var(--black);
    --shadow-sm: 2px 2px 0px var(--black);
    --shadow-hover: 6px 6px 0px var(--black);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background: var(--white);
    color: var(--gray-900);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---- Header ---- */
header {
    padding: 24px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.logo-text {
    font-size: 22px;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.logo-dot {
    color: var(--gray-500);
    font-weight: 600;
}

/* ---- Hero ---- */
.hero {
    text-align: center;
    padding: 60px 0 40px;
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: -2px;
    margin-bottom: 24px;
}

.highlight {
    background: var(--yellow);
    padding: 2px 12px;
    border-radius: 8px;
    display: inline-block;
    border: var(--border);
    box-shadow: var(--shadow-sm);
}

.manifest {
    max-width: 620px;
    margin: 0 auto;
    font-size: 17px;
    color: var(--gray-700);
    line-height: 1.7;
}

.manifest p {
    margin-bottom: 12px;
}

.manifest strong {
    color: var(--black);
}

/* ---- Pricing ---- */
.pricing {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    padding: 40px 0;
}

.card {
    border: var(--border);
    border-radius: var(--radius);
    padding: 32px 28px;
    position: relative;
    background: var(--white);
    box-shadow: var(--shadow);
    transition: box-shadow 0.2s, transform 0.2s;
}

.card:hover {
    box-shadow: var(--shadow-hover);
    transform: translate(-2px, -2px);
}

.card-featured {
    background: var(--yellow-light);
}

.card-badge {
    display: inline-block;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 4px 12px;
    border: 2px solid var(--black);
    border-radius: 100px;
    margin-bottom: 20px;
    background: var(--white);
}

.badge-yellow {
    background: var(--yellow);
}

.card-price {
    margin-bottom: 8px;
    display: flex;
    align-items: baseline;
    gap: 6px;
}

.price {
    font-size: 48px;
    font-weight: 900;
    letter-spacing: -2px;
    line-height: 1;
}

.period {
    font-size: 16px;
    color: var(--gray-500);
    font-weight: 500;
}

.card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 16px;
}

.card ul {
    list-style: none;
    margin-bottom: 24px;
}

.card li {
    padding: 6px 0;
    font-size: 15px;
    color: var(--gray-700);
    display: flex;
    align-items: center;
    gap: 8px;
}

.check {
    color: var(--black);
    font-weight: 700;
    font-size: 14px;
}

/* ---- Buttons ---- */
.btn {
    display: block;
    width: 100%;
    padding: 14px 24px;
    font-size: 16px;
    font-weight: 700;
    font-family: var(--font);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.15s;
    text-align: center;
    border: var(--border);
}

.btn-primary {
    background: var(--yellow);
    color: var(--black);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background: var(--yellow-hover);
    box-shadow: var(--shadow);
    transform: translate(-2px, -2px);
}

.btn-primary:active {
    box-shadow: none;
    transform: translate(2px, 2px);
}

.btn-outline {
    background: var(--white);
    color: var(--black);
    box-shadow: var(--shadow-sm);
}

.btn-outline:hover {
    background: var(--gray-50);
    box-shadow: var(--shadow);
    transform: translate(-2px, -2px);
}

.btn-outline:active {
    box-shadow: none;
    transform: translate(2px, 2px);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: var(--shadow-sm) !important;
}

/* ---- How It Works ---- */
.how-it-works {
    padding: 40px 0;
    text-align: center;
}

.how-it-works h2 {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 32px;
    letter-spacing: -1px;
}

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

.step {
    padding: 24px 20px;
    border: var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    background: var(--white);
}

.step-num {
    width: 40px;
    height: 40px;
    border: var(--border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 18px;
    margin: 0 auto 12px;
    background: var(--yellow);
}

.step h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 6px;
}

.step p {
    font-size: 14px;
    color: var(--gray-500);
}

/* ---- Devices ---- */
.devices {
    padding: 40px 0;
    text-align: center;
}

.devices h2 {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 32px;
    letter-spacing: -1px;
}

.device-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.device-card {
    padding: 24px 16px;
    border: var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    background: var(--white);
    transition: box-shadow 0.2s, transform 0.2s;
}

.device-card:hover {
    box-shadow: var(--shadow);
    transform: translate(-2px, -2px);
}

.device-icon {
    font-size: 32px;
    margin-bottom: 12px;
}

.device-card h4 {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 4px;
}

.device-card p {
    font-size: 13px;
    color: var(--gray-500);
    line-height: 1.4;
}

/* ---- FAQ ---- */
.faq {
    padding: 40px 0;
}

.faq h2 {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 24px;
    letter-spacing: -1px;
    text-align: center;
}

.faq-list {
    max-width: 700px;
    margin: 0 auto;
}

.faq-item {
    border: var(--border);
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    background: var(--white);
}

.faq-item summary {
    padding: 16px 20px;
    font-weight: 700;
    font-size: 15px;
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.faq-item summary::after {
    content: '+';
    font-size: 20px;
    font-weight: 800;
    transition: transform 0.2s;
}

.faq-item[open] summary::after {
    transform: rotate(45deg);
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item p {
    padding: 0 20px 16px;
    font-size: 14px;
    color: var(--gray-700);
    line-height: 1.6;
}

/* ---- Footer ---- */
footer {
    padding: 40px 0;
    border-top: 2px solid var(--gray-200);
    margin-top: 20px;
}

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

.footer-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 8px;
    font-weight: 700;
    font-size: 15px;
}

footer p {
    font-size: 14px;
    color: var(--gray-500);
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
    .pricing {
        grid-template-columns: 1fr;
    }

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

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

    .hero {
        padding: 40px 0 20px;
    }

    .hero h1 {
        font-size: 2.2rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

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

    .card {
        padding: 24px 20px;
    }
}