/* --- 1. VARIABLES --- */
:root {
    /* Nebula Palette */
    --bg-main: #030712;
    --bg-secondary: #0f172a;
    --primary: #2563eb;
    --primary-glow: rgba(37, 99, 235, 0.4);
    --accent: #06b6d4;
    --accent-glow: rgba(6, 182, 212, 0.4);
    
    /* Functional Colors */
    --success: #10b981;
    --error: #ef4444;
    --warning: #f59e0b;
    
    /* Text */
    --text-white: #f8fafc;
    --text-gray: #94a3b8;
    --text-placeholder: #64748b;

    /* UI */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --font-main: 'Outfit', sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- 2. RESET & BASE --- */
* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    background-color: var(--bg-main);
    color: var(--text-white);
    font-family: var(--font-main);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow-x: hidden;
}

a { text-decoration: none; color: inherit; transition: var(--transition); }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, select { font-family: inherit; }
.hidden { display: none !important; }
.mt-2 { margin-top: 12px; }
.mt-4 { margin-top: 24px; }
.cursor-pointer { cursor: pointer; }

/* Ambient Glows */
.ambient-glow {
    position: fixed; width: 600px; height: 600px;
    border-radius: 50%; filter: blur(140px); z-index: -1; opacity: 0.25;
    pointer-events: none;
}
.glow-1 { top: -150px; left: -150px; background: var(--primary); }
.glow-2 { bottom: -150px; right: -150px; background: var(--accent); }

/* --- 3. FIXED SMART BACK BUTTON --- */
.fixed-back-btn {
    position: fixed; top: 24px; right: 24px; z-index: 100;
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 20px;
    background: rgba(3, 7, 18, 0.6);
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1); border-radius: 50px;
    color: var(--text-gray); font-size: 0.9rem; font-weight: 500;
    transition: var(--transition); box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}
.fixed-back-btn:hover {
    background: rgba(255, 255, 255, 0.1); border-color: var(--text-white);
    color: var(--text-white); transform: translateX(-3px); box-shadow: 0 6px 16px rgba(0,0,0,0.3);
}

/* --- 4. LAYOUT & CARD --- */
.register-container {
    width: 100%; padding: 40px 24px;
    display: flex; justify-content: center; align-items: center; min-height: 100vh;
}
.glass-card {
    background: rgba(255, 255, 255, 0.02);
    backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
    border: 1px solid rgba(255, 255, 255, 0.08); border-radius: var(--radius-lg);
    padding: 40px; width: 100%; max-width: 520px;
    position: relative; box-shadow: 0 25px 60px -15px rgba(0, 0, 0, 0.6);
}
.glass-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
}

/* --- 5. HEADER & LOGO --- */
.card-header { text-align: center; margin-bottom: 28px; }
.logo-link { display: inline-block; margin-bottom: 16px; }
.card-logo { 
    height: 50px; width: auto; 
    filter: drop-shadow(0 0 8px rgba(255, 255, 255, 0.1));
    transition: var(--transition);
}
.logo-link:hover .card-logo { transform: scale(1.05); }
.card-header h1 { font-size: 1.8rem; font-weight: 700; margin-bottom: 8px; color: var(--text-white); }
.card-header p { color: var(--text-gray); font-size: 0.95rem; }

/* --- 6. FORMS & INPUTS --- */
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 18px; position: relative; }
.form-group label { display: block; font-size: 0.85rem; color: var(--text-gray); margin-bottom: 6px; font-weight: 500; }
.input-wrapper { position: relative; display: flex; align-items: center; }
.input-icon {
    position: absolute; left: 16px; color: var(--text-placeholder); font-size: 1rem;
    transition: var(--transition); pointer-events: none; z-index: 2;
}
.input-wrapper input, .input-wrapper select {
    width: 100%; background: rgba(3, 7, 18, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.1); border-radius: var(--radius-sm);
    padding: 12px 16px 12px 44px; color: var(--text-white); font-size: 0.95rem;
    transition: var(--transition); outline: none; appearance: none;
}
.input-wrapper input:focus, .input-wrapper select:focus, .custom-select-container.open input {
    border-color: var(--accent); background: rgba(3, 7, 18, 0.8);
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.15);
}
.input-wrapper input:focus ~ .input-icon, .input-wrapper select:focus ~ .input-icon, .custom-select-container.open .input-icon { color: var(--accent); }

/* Validation Styles */
.input-wrapper.valid input { border-color: var(--success); }
.input-wrapper.valid .input-icon { color: var(--success); }
.input-wrapper.invalid input { border-color: var(--error); }
.input-wrapper.invalid .input-icon { color: var(--error); }
.status-icon {
    position: absolute; right: 16px; font-size: 0.9rem; display: none; pointer-events: none;
}
.input-wrapper.valid .status-icon.success { display: block; color: var(--success); }
.input-wrapper.invalid .status-icon.error { display: block; color: var(--error); }
.live-feedback { font-size: 0.75rem; display: block; margin-top: 4px; height: 16px; line-height: 16px; }
.success-text { color: var(--success); }
.error-text { color: var(--error); }

/* Password Checklist */
.pass-checklist { list-style: none; display: flex; gap: 12px; margin-top: 8px; flex-wrap: wrap; }
.pass-checklist li {
    font-size: 0.75rem; color: var(--text-placeholder); display: flex; align-items: center; gap: 6px;
    transition: var(--transition);
}
.pass-checklist li i { font-size: 6px; }
.pass-checklist li.valid { color: var(--success); font-weight: 500; }
.pass-checklist li.valid i { color: var(--success); font-size: 10px; content: "\f00c"; } 

/* Toggle Password */
.toggle-password {
    position: absolute; right: 12px; color: var(--text-placeholder);
    transition: var(--transition); padding: 5px; z-index: 3;
}
.toggle-password:hover { color: var(--text-white); }
.input-wrapper.valid .toggle-password, .input-wrapper.invalid .toggle-password { right: 34px; }

/* Custom Dropdown */
.select-wrapper { position: relative; }
.select-arrow {
    position: absolute; right: 16px; color: var(--text-placeholder);
    font-size: 0.8rem; pointer-events: none; transition: var(--transition);
}
.input-wrapper select:focus + .select-arrow, .custom-select-container.open .select-arrow { color: var(--accent); transform: rotate(180deg); }
.custom-dropdown-menu {
    position: absolute; top: 100%; left: 0; width: 100%;
    background: rgba(10, 15, 30, 0.98); border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-sm); box-shadow: 0 10px 40px rgba(0,0,0,0.6);
    z-index: 1000; margin-top: 8px; padding: 10px 0;
    backdrop-filter: blur(16px); display: none; flex-direction: column;
}
.custom-dropdown-menu:not(.hidden) { display: flex; }
.dropdown-search-wrapper {
    padding: 0 12px 10px 12px; border-bottom: 1px solid rgba(255,255,255,0.08);
    margin-bottom: 6px; position: relative;
}
.search-icon { position: absolute; left: 24px; top: 12px; font-size: 0.85rem; color: var(--text-placeholder); z-index: 2; }
.dropdown-search {
    width: 100%; background: rgba(255,255,255,0.05) !important;
    border: 1px solid rgba(255,255,255,0.1) !important; border-radius: 4px !important;
    padding: 8px 12px 8px 34px !important; font-size: 0.9rem !important;
    color: var(--text-white) !important; outline: none; height: 36px !important;
}
.dropdown-search:focus { border-color: var(--accent) !important; }
.dropdown-list { list-style: none; max-height: 280px; overflow-y: auto; padding: 0; margin: 0; }
.dropdown-list::-webkit-scrollbar { width: 5px; }
.dropdown-list::-webkit-scrollbar-track { background: rgba(0,0,0,0.1); }
.dropdown-list::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.2); border-radius: 4px; }
.dropdown-item {
    padding: 10px 16px; cursor: pointer; font-size: 0.95rem; color: var(--text-gray);
    transition: all 0.2s; display: block; border-left: 2px solid transparent;
}
.dropdown-item:hover, .dropdown-item.focused { background: rgba(6, 182, 212, 0.1); color: var(--text-white); border-left-color: var(--accent); }
.dropdown-item.selected { background: rgba(6, 182, 212, 0.2); color: var(--text-white); font-weight: 600; border-left-color: var(--accent); }
.no-results { padding: 16px; text-align: center; color: var(--text-placeholder); font-size: 0.9rem; font-style: italic; }

/* Checkbox */
.form-options { margin-bottom: 24px; position: relative; display: flex; flex-direction: column; gap: 10px; }
.custom-checkbox { display: flex; align-items: flex-start; gap: 10px; cursor: pointer; color: var(--text-gray); user-select: none; font-size: 0.85rem; }
.custom-checkbox input { display: none; }
.checkmark {
    width: 18px; height: 18px; min-width: 18px; border: 1px solid rgba(255,255,255,0.2);
    border-radius: 4px; display: flex; align-items: center; justify-content: center;
    background: rgba(3, 7, 18, 0.6); transition: var(--transition); margin-top: 2px; position: relative;
}
.custom-checkbox input:checked ~ .checkmark { background: var(--primary); border-color: var(--primary); }
.checkmark::after {
    content: '';
    position: absolute;
    left: 6px;
    top: 2px;
    width: 4px;
    height: 8px;
    border: solid #fff;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
    opacity: 0;
    transition: opacity 0.15s ease;
}
.custom-checkbox input:checked ~ .checkmark::after { opacity: 1; }
.custom-checkbox a { color: var(--accent); text-decoration: none; border-bottom: 1px solid transparent; }
.custom-checkbox a:hover { border-bottom-color: var(--accent); }

/* --- 7. BUTTONS --- */
.submit-wrapper { margin-top: 10px; }
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 10px;
    padding: 14px 24px; border-radius: 50px; font-weight: 600; font-size: 1rem;
    transition: var(--transition); width: 100%; text-align: center; position: relative;
}
.btn-primary { background: linear-gradient(90deg, var(--primary), #1d4ed8); color: white; box-shadow: 0 4px 20px var(--primary-glow); border: 1px solid transparent; }
.btn-primary:not(:disabled):hover { transform: translateY(-2px); box-shadow: 0 8px 30px var(--primary-glow); }
.btn-primary:disabled { background: rgba(255,255,255,0.05); color: rgba(255,255,255,0.3); box-shadow: none; cursor: not-allowed; border-color: rgba(255,255,255,0.05); }
.missing-fields-text { font-size: 0.75rem; color: var(--warning); text-align: center; margin-top: 8px; min-height: 18px; opacity: 0.8; }
.btn-outline { background: transparent; border: 1px solid rgba(255,255,255,0.15); color: var(--text-gray); font-weight: 500; font-size: 0.95rem; margin-bottom: 0; }
.btn-outline:hover { background: rgba(255,255,255,0.05); border-color: var(--text-white); color: var(--text-white); }
.btn-block { width: 100%; }

/* --- 8. FEEDBACK MESSAGES (NEW) --- */
.form-feedback {
    margin-top: 16px;
    font-size: 0.9rem;
    text-align: center;
    min-height: 1.5em;
    transition: opacity 0.3s;
}
.form-feedback.success { color: var(--success); }
.form-feedback.error { color: var(--error); }
.cta-link { 
    display: inline-block; margin-top: 8px; color: var(--accent); 
    font-weight: 600; font-size: 0.95rem; text-decoration: underline; 
}
.cta-link:hover { color: var(--text-white); }

/* --- 9. FOOTER & DIVIDER --- */
.divider { display: flex; align-items: center; text-align: center; margin: 24px 0; color: var(--text-placeholder); font-size: 0.85rem; }
.divider::before, .divider::after { content: ''; flex: 1; border-bottom: 1px solid rgba(255,255,255,0.1); }
.divider span { padding: 0 10px; text-transform: uppercase; letter-spacing: 1px; font-size: 0.75rem; }
.social-login { margin-bottom: 24px; }

/* Regla de negocio: registro solo con formulario local (sin Google). */
.divider,
.social-login {
    display: none !important;
}
.card-footer { text-align: center; font-size: 0.9rem; color: var(--text-gray); }
.login-link { color: var(--text-white); font-weight: 600; margin-left: 5px; }
.login-link:hover { color: var(--accent); text-decoration: underline; }

/* Loader */
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
.fa-spin { animation: spin 1s linear infinite; }

/* --- 10. RESPONSIVE --- */
@media(min-width:1200px){ }
@media(max-width:1199px) and (min-width:992px){ .glass-card { max-width: 480px; } }
@media(max-width:991px) and (min-width:768px){ .glass-card { max-width: 460px; } }
@media(max-width:767px){
    .register-container { align-items: flex-start; padding: 20px 16px; padding-top: 80px; }
    .glass-card { padding: 24px; backdrop-filter: blur(14px); }
    .form-row { grid-template-columns: 1fr; gap: 0; }
    .card-header h1 { font-size: 1.5rem; }
    .fixed-back-btn { top: 16px; right: 16px; padding: 8px 16px; font-size: 0.85rem; }
}

@media (min-width: 1024px) and (max-width: 1600px) {
    .fixed-back-btn {
        top: 18px;
        right: 18px;
        padding: 8px 16px;
        font-size: 0.8rem;
    }

    .ambient-glow {
        width: 480px;
        height: 480px;
        filter: blur(112px);
    }

    .register-container {
        padding: 30px 18px;
    }

    .glass-card {
        max-width: 384px;
        padding: 32px;
        border-radius: 19px;
    }

    .card-header {
        margin-bottom: 26px;
    }

    .card-logo {
        height: 40px;
    }

    .card-header h1 {
        font-size: 1.44rem;
    }

    .card-header p,
    .card-footer,
    .form-feedback {
        font-size: 0.82rem;
    }

    .form-row {
        gap: 14px;
    }

    .form-group {
        margin-bottom: 16px;
    }

    .form-group label,
    .missing-fields-text,
    .custom-checkbox,
    .divider {
        font-size: 0.8rem;
    }

    .input-wrapper input,
    .input-wrapper select {
        min-height: 42px;
        padding: 10px 14px 10px 38px;
        font-size: 0.88rem;
    }

    .input-icon {
        left: 13px;
        font-size: 0.88rem;
    }

    .btn {
        padding: 11px 18px;
        font-size: 0.88rem;
    }
}