body {
    background:
        radial-gradient(circle at top right, rgba(59, 130, 246, 0.18), transparent 28%),
        radial-gradient(circle at bottom left, rgba(249, 115, 22, 0.14), transparent 26%),
        linear-gradient(135deg, #dbeafe 0%, #eff6ff 48%, #f8fbff 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: absolute;
    inset: 24px;
    border: 1px solid rgba(255, 255, 255, 0.55);
    border-radius: 36px;
    pointer-events: none;
}

body::after {
    content: '';
    position: absolute;
    top: -160px;
    left: 50%;
    transform: translateX(-50%);
    width: min(760px, 88vw);
    height: 360px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.5), transparent);
    filter: blur(28px);
    border-radius: 50%;
}

.auth-container {
    max-width: 520px;
    width: 100%;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.96);
    border: 1px solid rgba(226, 232, 240, 0.95);
    border-radius: 32px;
    box-shadow: 0 28px 70px rgba(37, 99, 235, 0.16);
    overflow: hidden;
    position: relative;
    z-index: 1;
    backdrop-filter: blur(10px);
}

.auth-container::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.52), transparent 120px);
    pointer-events: none;
}

.auth-header {
    padding: 38px 40px 18px;
    text-align: center;
    position: relative;
}

/* کارت روشن تا لوگوی رنگی رویش دیده شود (قبلا گرادیان آبی برای آیکون سفید بود) */
.auth-logo {
    width: 84px;
    height: 84px;
    background: #fff;
    border: 1px solid var(--border-light, #e2e8f0);
    border-radius: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 18px;
    box-shadow: 0 18px 36px rgba(30, 64, 175, 0.16);
}

.auth-logo img {
    width: 48px;
    height: 48px;
    object-fit: contain;
}

.auth-kicker {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    margin-bottom: 14px;
    background: rgba(219, 234, 254, 0.78);
    color: #1d4ed8;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 800;
}

.auth-title {
    font-size: 34px;
    line-height: 1.2;
    font-weight: 800;
    margin-bottom: 10px;
    color: #0f172a;
}

.auth-subtitle {
    color: #64748b;
    font-size: 15px;
    line-height: 1.9;
    max-width: 360px;
    margin: 0 auto;
}

.auth-body {
    padding: 0 40px 40px;
}

.auth-tabs {
    display: flex;
    padding: 0 40px;
    border-bottom: 2px solid var(--border-light);
    margin-bottom: 30px;
}

.auth-tab {
    flex: 1;
    padding: 14px;
    font-size: 14px;
    font-weight: 700;
    color: var(--text-muted);
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
    transition: var(--transition);
    cursor: pointer;
    background: none;
}

.auth-tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.auth-form {
    padding: 0 40px 40px;
    display: none;
}

.auth-form.active {
    display: block;
}

.form-group {
    margin-bottom: 18px;
    position: relative;
}

.field-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 8px;
}

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 8px;
    color: #1e293b;
}

.field-link {
    font-size: 12.5px;
    font-weight: 700;
    color: #2563eb;
}

.field-link:hover {
    color: #1d4ed8;
}

.form-input {
    width: 100%;
    min-height: 56px;
    padding: 14px 18px;
    border: 1px solid #d7deea;
    border-radius: 18px;
    font-size: 15px;
    font-family: inherit;
    color: #0f172a;
    background: linear-gradient(180deg, #ffffff, #f8fbff);
    transition: border-color .2s ease, box-shadow .2s ease, background-color .2s ease;
}

.form-input::placeholder {
    color: #94a3b8;
}

.form-input:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.12);
    background: #ffffff;
}

.form-input-ltr {
    direction: ltr;
    text-align: left;
}

.has-leading-icon .form-input {
    padding-right: 50px;
}

.has-trailing-action .form-input {
    padding-left: 54px;
}

.input-icon {
    position: absolute;
    right: 18px;
    top: 47px;
    color: #94a3b8;
    font-size: 16px;
    pointer-events: none;
}

.input-toggle {
    position: absolute;
    left: 12px;
    top: 39px;
    width: 36px;
    height: 36px;
    color: #64748b;
    cursor: pointer;
    background: none;
    border: 0;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background-color .2s ease, color .2s ease;
}

.input-toggle:hover {
    background: rgba(148, 163, 184, 0.12);
    color: #334155;
}

.auth-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 4px 0 22px;
    flex-wrap: wrap;
    gap: 12px;
    padding: 2px 2px 0;
}

.remember-option {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: #334155;
    cursor: pointer;
}

.remember-option input {
    width: 16px;
    height: 16px;
    accent-color: #2563eb;
}

.security-note {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 12.5px;
    color: #64748b;
}

.security-note i {
    color: #16a34a;
}

.auth-submit {
    width: 100%;
    min-height: 58px;
    padding: 14px 22px;
    font-size: 16px;
    margin-bottom: 22px;
    border-radius: 18px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    box-shadow: 0 18px 28px rgba(249, 115, 22, 0.24);
}

.auth-divider {
    text-align: center;
    margin: 20px 0;
    position: relative;
    color: var(--text-muted);
    font-size: 13px;
}

.auth-divider::before {
    content: '';
    position: absolute;
    top: 50%;
    right: 0;
    left: 0;
    height: 1px;
    background: var(--border-light);
    z-index: 0;
}

.auth-divider span {
    background: white;
    padding: 0 16px;
    position: relative;
    z-index: 1;
}

.social-login {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 10px;
}

.social-btn {
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 13px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition);
    background: white;
    color: var(--text);
}

.social-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.auth-footer {
    text-align: center;
    margin-top: 20px;
    font-size: 13px;
    color: var(--text-muted);
}

.auth-footer a {
    color: var(--primary);
    font-weight: 600;
}

.back-home {
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.88);
    border-radius: 999px;
    font-size: 13px;
    color: var(--text);
    border: 1px solid rgba(226, 232, 240, 0.92);
    box-shadow: 0 18px 30px rgba(15, 23, 42, 0.08);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    z-index: 2;
    backdrop-filter: blur(10px);
}

.back-home:hover {
    color: var(--primary);
    border-color: rgba(147, 197, 253, 0.95);
}

@media (max-width: 480px) {
    body {
        align-items: flex-start;
        padding: 84px 12px 16px;
    }

    body::before {
        inset: 10px;
        border-radius: 28px;
    }

    .auth-container {
        border-radius: 26px;
    }

    .auth-header {
        padding: 30px 24px 16px;
    }

    .auth-body {
        padding: 0 20px 28px;
    }

    .auth-tabs {
        padding: 0 24px;
    }

    .auth-form {
        padding: 0 24px 30px;
    }

    .auth-title {
        font-size: 28px;
    }

    .auth-subtitle {
        font-size: 14px;
    }

    .back-home {
        top: 16px;
        right: 12px;
        font-size: 12px;
        padding: 8px 12px;
    }

    .field-head {
        align-items: flex-start;
        flex-direction: column;
        gap: 6px;
    }

    .input-icon {
        top: 49px;
    }

    .input-toggle {
        top: 42px;
    }

    .auth-options {
        align-items: flex-start;
        flex-direction: column;
    }
}