:root {
    --flex-green: #22c55e;
    --flex-black: #05090D;
    --flex-gray: #677179;
    --flex-light-bg: #FFFFFF;
    --flex-border: #bbbcbd;
    --flex-soft-blue: #EBF2FF;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
    letter-spacing: -0.02em;
}

body {
    background-color: var(--flex-light-bg);
    color: var(--flex-black);
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

/* ====================== LOGO HERO ====================== */
.logo-hero {
    text-align: center;
    margin-bottom: 60px;
}

.hero-logo {
    max-width: 100px;
    width: 100px;
    height: 111px;
    display: block;
    margin: 0 auto;
    filter: drop-shadow(0 10px 20px rgba(0,0,0,0.08));
}

@media (max-width: 768px) {
    .hero-logo {
        max-width: 100px;
    }
    .logo-hero {
        margin-bottom: 20px;
    }
}

/* Container */
#app-container {
    width: 100%;
    max-width: 800px;
    padding: 80px 20px 60px;
    text-align: center;
    flex-grow: 1;
}

/* Typography */
.slogan-principal {
    font-size: 56px;
    font-weight: 800;
    line-height: 0.95;
    margin-bottom: 16px;
    letter-spacing: -0.05em;
}

.slogan-sub {
    font-size: 20px;
    color: var(--flex-gray);
    margin-bottom: 60px;
    font-weight: 500;
}

/* Steps */
.step {
    display: none;
    opacity: 0;
}

.step.active {
    display: block;
    opacity: 1;
}

.input-wrapper {
    max-width: 500px;
    margin: 0 auto;
}

label {
    display: block;
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 30px;
}

input {
    width: 100%;
    padding: 20px;
    font-size: 18px;
    border: 2px solid var(--flex-border);
    border-radius: 16px;
    margin-bottom: 20px;
    outline: none;
    transition: all 0.2s;
    background: #F9FAFB;
}

input:focus {
    border-color: var(--flex-green);
    background: white;
    box-shadow: 0 0 0 4px var(--flex-soft-blue);
}

/* Buttons */
.flex-btn-main {
    width: 100%;
    background: var(--flex-green);
    color: white;
    border: none;
    padding: 20px;
    font-size: 18px;
    font-weight: 700;
    border-radius: 20px;
    cursor: pointer;
    transition: transform 0.2s, background 0.2s;
}

.flex-btn-main:hover {
    background: #000000;
    transform: scale(1.02);
}

.hint {
    margin-top: 15px;
    color: var(--flex-gray);
    font-size: 14px;
}

/* Cards de Planes */
.cards-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 20px;
}

.flex-card {
    padding: 40px 30px;
    border-radius: 32px;
    text-align: left;
    border: 1px solid var(--flex-border);
    display: flex;
    flex-direction: column;
}

.flex-card.premium {
    background: var(--flex-black);
    color: white;
    border: none;
}

.card-tag {
    font-size: 16px;
    font-weight: 800;
    margin-bottom: 10px;
    display: block;
    color: var(--flex-gray);
}

.card-tag.highlight {
    color: var(--flex-green);
}

.card-title {
    font-size: 24px;
    font-weight: 800;
    margin-bottom: 10px;
}

.card-price {
    font-size: 40px;
    font-weight: 800;
    margin-bottom: 20px;
}

.old-p {
    font-size: 40px;
    text-decoration: line-through;
    opacity: 0.5;
}

.flex-features {
    list-style: none;
    margin-bottom: 30px;
    flex-grow: 1;
}

.flex-features li {
    margin-bottom: 12px;
    font-size: 15px;
    opacity: 0.9;
}

.flex-features li::before {
    content: "●";
    color: var(--flex-green);
    margin-right: 8px;
}

/* Botones de Card */
.card-btn-primary {
    background: var(--flex-green);
    color: white;
    border: none;
    padding: 16px;
    border-radius: 20px;
    font-weight: 700;
    font-size: 16px;
    cursor: pointer;
}

.card-btn-secondary {
    background: white;
    color: var(--flex-black);
    border: 2px solid var(--flex-border);
    padding: 16px;
    border-radius: 20px;
    font-weight: 700;
    font-size: 16px;
    cursor: pointer;
}

/* ====================== BOTONES TIPO PISO (Step 1) ====================== */
.type-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.type-btn {
    width: 100%;
    padding: 20px;
    font-size: 18px;
    font-weight: 600;
    background: #F9FAFB;
    color: var(--flex-black);
    border: 2px solid var(--flex-border);
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.2s;
}

.type-btn:hover {
    border-color: var(--flex-green);
    background: white;
    transform: scale(1.02);
}

.type-btn.selected {
    border-color: var(--flex-green);
    background: var(--flex-green);
    color: white;
}

#btn-top {
    position: fixed;
    bottom: 32px;
    right: 24px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--flex-black);
    color: #fff;
    font-size: 18px;
    border: none;
    cursor: pointer;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s, transform 0.3s;
    z-index: 999;
    box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}

#btn-top.visible {
    opacity: 1;
    pointer-events: auto;
}

#btn-top:hover {
    background: var(--flex-green);
    transform: translateY(-2px);
}

.btn-cliente {
    display: block;
    background: #000;
    color: white;
    font-weight: 700;
    font-size: 16px;
    text-decoration: none;
    padding: 16px 32px;
    border-radius: 20px;
    text-align: center;
    width: fit-content;
    margin: 60px auto 40px;
    transition: background 0.2s, transform 0.2s;
}

.btn-cliente:hover {
    background: var(--flex-green);
    transform: scale(1.02);
}

/* ====================== RESPONSIVE ====================== */
@media (max-width: 768px) {
    .slogan-principal { font-size: 32px; }
    .slogan-sub { font-size: 17px; margin-bottom: 30px; }
    .cards-layout { grid-template-columns: 1fr; }
    #app-container { padding-top: 2%; }

    label { font-size: 22px; margin-bottom: 20px; }
    input { font-size: 16px; padding: 16px; }
    .flex-btn-main { font-size: 17px; padding: 18px; }

    .card-title { font-size: 20px; }
    .card-price { font-size: 32px; }
    .old-p { font-size: 32px; }
    .card-tag { font-size: 13px; }
    .flex-features li { font-size: 14px; }
    .card-btn-primary,
    .card-btn-secondary { font-size: 15px; padding: 14px; }

    .type-btn { font-size: 16px; padding: 18px; }
    .btn-cliente {
        width: calc(100% - 40px);
        margin: 40px auto 32px;
        box-shadow: 0 4px 20px rgba(34,197,94,0.25);
    }

    .btn-cliente:hover {
        transform: none;
    }
}

/* Pantallas muy pequeñas */
@media (max-width: 400px) {
    .slogan-principal { font-size: 27px; }
    .slogan-sub { font-size: 15px; }
    label { font-size: 20px; }
    input { font-size: 15px; }
}