/* Estilos modernos para el login */
.login-container {
    min-height: 100vh;
    background: linear-gradient(135deg, #e8f4fd 0%, #f0f8ff 50%, #fff8dc 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    position: relative;
    overflow: hidden;
}

.login-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="75" cy="75" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="50" cy="10" r="0.5" fill="rgba(255,255,255,0.05)"/><circle cx="10" cy="60" r="0.5" fill="rgba(255,255,255,0.05)"/><circle cx="90" cy="40" r="0.5" fill="rgba(255,255,255,0.05)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.login-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 18px;
    box-shadow: 0 22px 45px rgba(0, 0, 0, 0.18);
    padding: 2rem;
    width: 100%;
    max-width: 560px;
    max-height: 88vh;
    overflow: auto;
    position: relative;
    z-index: 1;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.login-header {
    text-align: center;
    margin-bottom: 1.5rem;
}

.login-title {
    font-size: 1.9rem;
    font-weight: 700;
    color: #5a6c7d;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #87ceeb, #5a9fd4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.login-subtitle {
    color: #718096;
    font-size: 1rem;
    font-weight: 400;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    text-decoration: none;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.social-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #87ceeb, #5a9fd4);
    opacity: 0;
    transition: opacity 0.3s ease;
    border-radius: 50%;
}

.social-link:hover::before { opacity: 1; }

.social-link i {
    font-size: 1rem;
    color: #4a5568;
    transition: all 0.3s ease;
    position: relative;
    z-index: 1;
}

.social-link:hover i { color: #fff; transform: scale(1.1); }

.form-group { margin-bottom: .9rem; position: relative; }

.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid #e2e8f0;
    border-radius: 10px;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
}

.form-input:focus {
    outline: none;
    border-color: #87ceeb;
    box-shadow: 0 0 0 3px rgba(135, 206, 235, 0.15);
    background: #fff;
}

.form-input::placeholder { color: #a0aec0; font-weight: 400; }
.form-input:disabled { opacity: .6; cursor: not-allowed; background: rgba(255,255,255,.5); }

.project-selector { position: relative; width: 100%; margin-bottom: 1.5rem; }

.project-selector-button {
    width: 100%;
    padding: 1rem 1.2rem;
    border: 2px solid #e8f2ff;
    border-radius: 16px;
    font-size: 1rem;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(15px);
    color: #5a6c7d;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: space-between;
    text-align: left;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(135, 206, 235, 0.15);
}
.project-selector-button::before {
    content: '';
    position: absolute; top:0; left:-100%; width:100%; height:100%;
    background: linear-gradient(135deg, rgba(135,206,235,.08), rgba(255,255,224,.08));
    transition: left .4s ease;
}
.project-selector-button:hover::before { left: 0; }
.project-selector-button:hover { border-color:#87ceeb; box-shadow:0 8px 25px rgba(135,206,235,.25); transform: translateY(-2px); background: rgba(255,255,255,.98); }
.project-selector-button:focus { outline:none; border-color:#87ceeb; box-shadow:0 0 0 4px rgba(135,206,235,.15); background:#fff; }
.project-selector-button.open { border-color:#87ceeb; box-shadow:0 0 0 4px rgba(135,206,235,.15); background:#fff; }

.selector-text { position: relative; z-index: 1; flex: 1; font-weight:500; color:#5a6c7d; }
.selector-icon { position: relative; z-index:1; color:#87ceeb; transition: transform .3s ease; font-size:1.1rem; }
.project-selector-button.open .selector-icon { transform: rotate(180deg); color:#5a9fd4; }

.project-dropdown {
    position: absolute; top:100%; left:0; right:0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(135, 206, 235, 0.2);
    border-radius: 16px;
    box-shadow: 0 15px 35px rgba(135, 206, 235, 0.2);
    max-height: 300px; overflow-y: auto; z-index: 1000; display: none;
    animation: slideDown .3s ease; margin-top: .5rem;
}
.project-dropdown.show { display: block; }
@keyframes slideDown { from{opacity:0; transform: translateY(-10px);} to{opacity:1; transform:none;} }

.project-dropdown::-webkit-scrollbar { width: 6px; }
.project-dropdown::-webkit-scrollbar-track { background: rgba(135,206,235,.1); border-radius:3px; }
.project-dropdown::-webkit-scrollbar-thumb { background: linear-gradient(135deg, #87ceeb, #5a9fd4); border-radius:3px; }
.project-dropdown::-webkit-scrollbar-thumb:hover { background: linear-gradient(135deg, #5a9fd4, #4682b4); }

.project-option { padding: 1rem 1.2rem; cursor: pointer; transition: all .3s ease; border-bottom: 1px solid rgba(135,206,235,.1); position: relative; overflow: hidden; }
.project-option:last-child { border-bottom: none; }
.project-option::before { content:''; position:absolute; top:0; left:-100%; width:100%; height:100%; background: linear-gradient(135deg, rgba(135,206,235,.08), rgba(255,255,224,.08)); transition:left .3s ease; }
.project-option:hover::before { left: 0; }
.project-option:hover { color:#5a9fd4; transform: translateX(3px); }
.project-option.selected { background: linear-gradient(135deg, rgba(135,206,235,.12), rgba(255,255,224,.08)); color:#5a9fd4; font-weight: 600; }
.project-code { font-weight: 600; color:#87ceeb; margin-right:.5rem; position: relative; z-index:1; background: rgba(135,206,235,.1); padding: 2px 6px; border-radius: 6px; font-size:.9rem; }
.project-name { position: relative; z-index:1; color:#5a6c7d; }
.project-option:hover .project-name { color:#5a9fd4; }
.project-option:hover .project-code { background: rgba(135,206,235,.2); color:#5a9fd4; }
.project-option.selected .project-name { color:#5a9fd4; }
.project-option.selected .project-code { background: rgba(135,206,235,.25); color:#4682b4; }
.project-option-empty { padding: 1rem 1.2rem; text-align:center; color:#a0aec0; font-style: italic; cursor: default; }
.project-option-loading { padding: 1rem 1.2rem; text-align:center; color:#87ceeb; font-style: italic; cursor: default; }
.project-option-loading::before { content:''; display:inline-block; width:16px; height:16px; border:2px solid #e8f2ff; border-top:2px solid #87ceeb; border-radius: 50%; animation: spin 1s linear infinite; margin-right:8px; }
@keyframes spin { 0%{ transform: rotate(0deg);} 100%{ transform: rotate(360deg);} }

.dropdown-overlay { position: fixed; top:0; left:0; right:0; bottom:0; z-index:999; display:none; }
.dropdown-overlay.show { display:block; }

.login-button {
    width: 100%; padding: 0.8rem 1.4rem; background: linear-gradient(135deg, #87ceeb, #5a9fd4); color:#fff; border:0; border-radius:12px; font-size:1rem; font-weight:600; cursor:pointer; transition: all .3s ease; position: relative; overflow:hidden; margin-bottom: 1.2rem; box-shadow: 0 4px 15px rgba(135,206,235,.3);
}
.login-button::before { content:''; position:absolute; top:0; left:-100%; width:100%; height:100%; background: linear-gradient(90deg, transparent, rgba(255,255,255,.2), transparent); transition: left .5s ease; }
.login-button:hover::before { left: 100%; }
.login-button:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(135,206,235,.4); }
.login-button:active { transform: translateY(0); }
.login-button:disabled { opacity:.7; cursor:not-allowed; transform:none; box-shadow: 0 4px 15px rgba(135,206,235,.2); }
.login-button:disabled:hover { transform:none; box-shadow: 0 4px 15px rgba(135,206,235,.2); }
.login-button.loading { position: relative; color: transparent; }
.login-button.loading::after { content:''; position:absolute; top:50%; left:50%; width:20px; height:20px; margin:-10px 0 0 -10px; border:2px solid rgba(255,255,255,.3); border-top:2px solid #fff; border-radius: 50%; animation: spin 1s linear infinite; }

.forgot-password { text-align:center; margin-top: 1rem; }
.forgot-password a { color:#87ceeb; text-decoration:none; font-weight:500; transition: color .3s ease; }
.forgot-password a:hover { color:#5a9fd4; text-decoration: underline; }

.error-message { background:#fed7d7; color:#c53030; padding:.75rem 1rem; border-radius: 8px; margin-bottom:1rem; border-left:4px solid #e53e3e; font-size:.9rem; display:none; }
.error-message.show { display:block; animation: slideIn .3s ease; }
@keyframes slideIn { from{opacity:0; transform: translateY(-10px);} to{opacity:1; transform:none;} }

/* Overrides para neutralizar estilos antiguos de style_login.css */
.formulario{
    background: transparent !important;
    box-shadow: none !important;
    width: 100% !important;
    margin: 0 !important;
    padding: 0 !important;
    border: 0 !important;
}
.formulario .form-input{
    width: 100% !important;
    margin: 0.75rem 0 !important;
    border: 2px solid #e2e8f0 !important;
    border-radius: 12px !important;
    text-align: left !important;
    background: rgba(255, 255, 255, 0.8) !important;
    color: #1f2d3d !important;
}

/* Ajuste de espacios únicamente en el formulario de registro */
.formulario-register .form-input{ margin: 0.55rem 0 !important; }

/* Toggle de vistas de formularios */
.container-form{ width:100%; display:flex; align-items:center; justify-content:center; }
.container-form.sign-in{ position: relative; }
.container-form.sign-up{ position: relative; }
.container-form .login-card{ width: 100%; }

/* Estados de visibilidad como en la versión previa */
.sign-in{ opacity: 0; visibility: hidden; }
.sign-in.active{ opacity: 1; visibility: visible; }
.sign-up.active{ opacity: 0; visibility: hidden; }

/* Tabs superiores */
.tabs-header{ display:flex; gap:.5rem; margin-bottom:.75rem; background: rgba(135,206,235,.08); padding:.3rem; border-radius:12px; }
.tab-button{ flex:1; border:0; background:transparent; padding:.5rem .85rem; border-radius:10px; color:#5a6c7d; font-weight:600; cursor:pointer; transition:.2s; font-size:.95rem; }
.tab-button.active{ background:#fff; color:#2e4661; box-shadow: 0 6px 16px rgba(135,206,235,.25); }
.tab-button:hover{ filter: brightness(.98); }

/* Paneles */
.tab-panel{ display:none; opacity:0; transform: translateY(8px); transition: opacity .25s ease, transform .25s ease; }
.tab-panel.active{ display:block; }
.tab-panel.show{ opacity:1; transform:none; }

@media (max-width: 480px) {
    .login-card { margin: 1rem; padding: 1.25rem; max-height: 85vh; }
    .login-title { font-size: 1.6rem; }
}

/* Estados de validación en campos */
.form-group.invalid .form-input{ border-color:#f6b2b2 !important; box-shadow: 0 0 0 3px rgba(229,62,62,.12) !important; }
.form-group.valid .form-input{ border-color:#87ceeb !important; box-shadow: 0 0 0 3px rgba(135,206,235,.15) !important; }
.input-error{ color:#c53030; font-size:.85rem; margin-top:.35rem; display:none; }
.form-group.invalid .input-error{ display:block; }

/* Etiqueta para proveedor detectado */
.provider-info{ display:block; color:#5a6c7d; margin:.25rem 0 .75rem; }
.provider-info small{ color:#7e9ab2; margin-right:.35rem; }
.provider-info #nomProveedor{ font-weight:600; font-size: .95rem; }

@media (max-width: 1440px) {
    .login-card{ max-width: 520px; padding: 1.6rem; max-height: 86vh; }
    .login-title{ font-size: 1.75rem; }
    .form-input{ padding: 0.65rem 0.85rem; font-size: 0.9rem; }
    .login-button{ padding: 0.75rem 1.2rem; font-size: 0.95rem; }
    .social-link{ width: 36px; height: 36px; }
    .social-link i{ font-size: .95rem; }
}

/* Grid de 2 columnas para el registro */
.form-grid-2{ display:grid; grid-template-columns: repeat(2, 1fr); gap: .9rem; }
.form-grid-2 .form-group{ margin-bottom: 0; }
@media (max-width: 640px){ .form-grid-2{ grid-template-columns: 1fr; } }