/* ============================================================
   Login Page — SIIE CONSTRUCTORA Admin
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;700&display=swap');

:root {
    --primary-blue:    #3b82f6;
    --dark-bg:         #030712;
    --card-bg:         rgba(255, 255, 255, 0.04);
    --border:          rgba(255, 255, 255, 0.1);
    --white:           #ffffff;
    --gray:            #9ca3af;
    --error:           #ef4444;
    --font:            'Inter', sans-serif;
}

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

body {
    font-family: var(--font);
    background-color: var(--dark-bg);
    color: var(--white);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-image:
        radial-gradient(ellipse at 20% 50%, rgba(59, 130, 246, 0.08) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(59, 130, 246, 0.05) 0%, transparent 50%);
    overflow: hidden;
}

/* ── Fondo animado ── */
.bg-glow {
    position: fixed;
    top: -30%;
    left: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(59,130,246,0.12) 0%, transparent 70%);
    animation: floatGlow 8s ease-in-out infinite alternate;
    pointer-events: none;
    z-index: 0;
}

@keyframes floatGlow {
    from { transform: translate(0, 0) scale(1); }
    to   { transform: translate(60px, 40px) scale(1.1); }
}

/* ── Card ── */
.login-card {
    position: relative;
    z-index: 10;
    width: 100%;
    max-width: 420px;
    padding: 3rem 2.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255,255,255,0.05);
    animation: cardIn 0.5s ease-out both;
}

@keyframes cardIn {
    from { opacity: 0; transform: translateY(24px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ── Logo ── */
.login-logo {
    text-align: center;
    margin-bottom: 0.5rem;
}

.login-logo .brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: 4px;
    color: var(--white);
}
.login-logo .brand img {
    height: 32px;
    width: auto;
    border-radius: 4px;
}

.login-logo .brand span {
    color: var(--primary-blue);
}

.login-logo .subtitle {
    font-size: 0.8rem;
    color: var(--gray);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-top: 0.25rem;
}

.divider {
    height: 1px;
    background: var(--border);
    margin: 1.5rem 0;
}

/* ── Form ── */
.login-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--white);
    text-align: center;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    margin-bottom: 1.2rem;
}

.form-group label {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--gray);
}

.form-group input {
    width: 100%;
    padding: 0.85rem 1rem;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--white);
    font-family: var(--font);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.25s, box-shadow 0.25s;
}

.form-group input:focus {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
}

.form-group input::placeholder {
    color: rgba(255,255,255,0.25);
}

/* ── Submit button ── */
.btn-login {
    width: 100%;
    padding: 0.9rem;
    background: var(--primary-blue);
    color: var(--white);
    border: none;
    border-radius: 8px;
    font-family: var(--font);
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: background 0.25s, transform 0.2s, box-shadow 0.25s;
    margin-top: 0.5rem;
    position: relative;
    overflow: hidden;
}

.btn-login:hover {
    background: #2563eb;
    box-shadow: 0 8px 24px rgba(59,130,246,0.35);
    transform: translateY(-1px);
}

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

.btn-login.loading {
    pointer-events: none;
    opacity: 0.7;
}

.btn-login .btn-text { transition: opacity 0.2s; }
.btn-login.loading .btn-text { opacity: 0; }

.btn-login .spinner {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 20px; height: 20px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: var(--white);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    display: none;
}

.btn-login.loading .spinner { display: block; }

@keyframes spin {
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* ── Error ── */
.login-error {
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    background: rgba(239,68,68,0.1);
    border: 1px solid rgba(239,68,68,0.4);
    border-radius: 8px;
    color: #fca5a5;
    font-size: 0.9rem;
    text-align: center;
    display: none;
}

.login-error.visible { display: block; }

/* ── Back link ── */
.back-link {
    display: block;
    text-align: center;
    margin-top: 1.5rem;
    font-size: 0.85rem;
    color: var(--gray);
    text-decoration: none;
    transition: color 0.2s;
}

.back-link:hover { color: var(--white); }

/* ── Responsive ── */
@media (max-width: 480px) {
    .login-card {
        margin: 1rem;
        padding: 2rem 1.5rem;
    }
}